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United States Navy
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The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U. S. Navy is the largest, most capable navy in the world, the U. S. Navy has the worlds largest aircraft carrier fleet, with ten in service, two in the reserve fleet, and three new carriers under construction. The service has 323,792 personnel on duty and 108,515 in the Navy Reserve. It has 274 deployable combat vessels and more than 3,700 operational aircraft as of October 2016, the U. S. Navy traces its origins to the Continental Navy, which was established during the American Revolutionary War and was effectively disbanded as a separate entity shortly thereafter. It played a role in the American Civil War by blockading the Confederacy. It played the role in the World War II defeat of Imperial Japan. The 21st century U. S. Navy maintains a global presence, deploying in strength in such areas as the Western Pacific, the Mediterranean. The Navy is administratively managed by the Department of the Navy, the Department of the Navy is itself a division of the Department of Defense, which is headed by the Secretary of Defense. The Chief of Naval Operations is an admiral and the senior naval officer of the Department of the Navy. The CNO may not be the highest ranking officer in the armed forces if the Chairman or the Vice Chairman of the Joint Chiefs of Staff. The mission of the Navy is to maintain, train and equip combat-ready Naval forces capable of winning wars, deterring aggression, the United States Navy is a seaborne branch of the military of the United States. The Navys three primary areas of responsibility, The preparation of naval forces necessary for the prosecution of war. The development of aircraft, weapons, tactics, technique, organization, U. S. Navy training manuals state that the mission of the U. S. Armed Forces is to prepare and conduct prompt and sustained combat operations in support of the national interest, as part of that establishment, the U. S. Navys functions comprise sea control, power projection and nuclear deterrence, in addition to sealift duties. It follows then as certain as that night succeeds the day, that without a decisive naval force we can do nothing definitive, the Navy was rooted in the colonial seafaring tradition, which produced a large community of sailors, captains, and shipbuilders. In the early stages of the American Revolutionary War, Massachusetts had its own Massachusetts Naval Militia, the establishment of a national navy was an issue of debate among the members of the Second Continental Congress. Supporters argued that a navy would protect shipping, defend the coast, detractors countered that challenging the British Royal Navy, then the worlds preeminent naval power, was a foolish undertaking. Commander in Chief George Washington resolved the debate when he commissioned the ocean-going schooner USS Hannah to interdict British merchant ships, and reported the captures to the Congress
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Naval History and Heritage Command
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When the British invaded Washington in 1814 this collection, containing the finest works on naval history from America and abroad, was rushed to safety outside the Federal City. Thereafter the library had many locations, including a specially designed space in the State, War and he also began to collect and preserve naval records, particularly those of the American Civil War. Congress initially recognized his efforts by authorizing funds for staff and combining the library and records sections into the Office of Library. In 1915 the appropriations for publications, the library, and naval war records were combined, once America entered World War I, emphasis shifted to gathering documents on current naval operations. To handle World War I records in Washington, a Historical Section was established in the Office of the Chief of Naval Operations and housed in the new Navy Department Building on Constitution Avenue. When the war ended, Admiral Sims London collection, as well as photographs, the library, by now holding more than 50,000 volumes, remained in the State, War, and Navy Building. In 1921, a member of Admiral Sims wartime staff, Captain Dudley W. Knox, was named head of the Office of Naval Records and Library. For the next years he was the driving force behind the Navys historical program, earning for the office an international reputation in the field of naval archives. The Historical Section was absorbed into Naval Records and Library in 1927, knoxs additional appointment as the Curator for the Navy envisioned a display of our nations sea heritage in a naval museum in Washington. In 1961, Admiral Arleigh Burke, Chief of Naval Operations, at President Franklin D. Roosevelts suggestion, Knox began several documentary series. Seven volumes pertaining to the Quasi War with France and seven volumes relating to the war with the Barbary Powers were ultimately published, World War II halted plans for similar publications on the American Revolution, the War of 1812, the Mexican–American War, and World War I. During World War II, Knox turned his attention to collecting documents generated by operations in the global conflict. Knox served as Deputy Director of Naval History under the Director, in 1952 it was renamed the Naval History Division. The eventual home for the Navys historians was the Washington Navy Yard in Southeast Washington, the first component of the Naval History Division located in the yard was the Navy Museum, established in 1961. In 1963, the Operational Archives moved to the Navy Yard, the other sections of the Naval History Division followed in 1970, occupying several scattered buildings. An organizational change in 1971 shifted the Naval History Division from an establishment to a field activity called the Naval Historical Center, under the Chief of Naval Operations. In 1986, the Navy Art Collection and Gallery and the Naval Aviation History and Publication Division,2008 was a year of change for the Navys history program. First, the command was streamlined into four components, Histories and Archives, Museums and Collections, Integration and Outreach
3.
Engraving
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Engraving is the practice of incising a design onto a hard, usually flat surface by cutting grooves into it. Wood engraving is a form of printing and is not covered in this article. Engraving was an important method of producing images on paper in artistic printmaking, in mapmaking. Other terms often used for printed engravings are copper engraving, copper-plate engraving or line engraving, hand engraving is a term sometimes used for engraving objects other than printing plates, to inscribe or decorate jewellery, firearms, trophies, knives and other fine metal goods. Traditional engravings in printmaking are also engraved, using just the same techniques to make the lines in the plate. Each graver is different and has its own use, engravers use a hardened steel tool called a burin, or graver, to cut the design into the surface, most traditionally a copper plate. Modern professional engravers can engrave with a resolution of up to 40 lines per mm in high grade work creating game scenes, dies used in mass production of molded parts are sometimes hand engraved to add special touches or certain information such as part numbers. In addition to engraving, there are engraving machines that require less human finesse and are not directly controlled by hand. They are usually used for lettering, using a pantographic system, there are versions for the insides of rings and also the outsides of larger pieces. Such machines are used for inscriptions on rings, lockets. Gravers come in a variety of shapes and sizes that yield different line types, the burin produces a unique and recognizable quality of line that is characterized by its steady, deliberate appearance and clean edges. The angle tint tool has a curved tip that is commonly used in printmaking. Florentine liners are flat-bottomed tools with multiple lines incised into them, ring gravers are made with particular shapes that are used by jewelry engravers in order to cut inscriptions inside rings. Flat gravers are used for work on letters, as well as wriggle cuts on most musical instrument engraving work, remove background. Knife gravers are for line engraving and very deep cuts, round gravers, and flat gravers with a radius, are commonly used on silver to create bright cuts, as well as other hard-to-cut metals such as nickel and steel. Square or V-point gravers are typically square or elongated diamond-shaped and used for cutting straight lines, V-point can be anywhere from 60 to 130 degrees, depending on purpose and effect. These gravers have very small cutting points, other tools such as mezzotint rockers, roulets and burnishers are used for texturing effects. Burnishing tools can also be used for stone setting techniques
4.
Old master print
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An old master print is a work of art produced by a printing process within the Western tradition. Fifteenth-century prints are rare that they are classed as old master prints even if they are of crude or merely workmanlike artistic quality. A date of about 1830 is usually taken as marking the end of the period whose prints are covered by this term, the main techniques used, in order of their introduction, are woodcut, engraving, etching, mezzotint and aquatint, although there are others. Different techniques are combined in a single print. With rare exceptions printed on textiles, such as silk, or on vellum, many great European artists, such as Albrecht Dürer, Rembrandt, and Francisco Goya, were dedicated printmakers. In their own day, their international reputations largely came from their prints, influences between artists were also mainly transmitted beyond a single city by prints, for the same reason. Prints therefore are frequently brought up in detailed analyses of individual paintings in art history, today, thanks to colour photo reproductions, and public galleries, their paintings are much better known, whilst their prints are only rarely exhibited, for conservation reasons. But some museum print rooms allow visitors to see their collection, the oldest technique is woodcut, or woodblock printing, which was invented as a method for printing on cloth in China, and perhaps separately in Egypt in the Byzantine period. This had reached Europe via the Byzantine or Islamic worlds before 1300, religious images and playing cards are documented as being produced on paper, probably printed, by a German in Bologna in 1395. However, the most impressive printed European images to survive from before 1400 are printed on cloth, for use as hangings on walls or furniture, including altars, some were used as a pattern to embroider over. Some religious images were used as bandages, to speed healing, the earliest print images are mostly of a high artistic standard, and were clearly designed by artists with a background in painting. Whether these artists cut the blocks themselves, or only inked the design on the block for another to carve, is not known, the great majority of surviving 15th-century prints are religious, although these were probably the ones more likely to survive. Their makers were sometimes called Jesus maker or saint-maker in documents, as with manuscript books, monastic institutions sometimes produced, and often sold, prints. No artists can be identified with specific woodcuts until towards the end of the century, the little evidence we have suggests that woodcut prints became relatively common and cheap during the fifteenth century, and were affordable by skilled workers in towns. For example, what may be the earliest surviving Italian print, the school caught fire, and the crowd who gathered to watch saw the print carried up into the air by the fire, before falling down into the crowd. This was regarded as an escape and the print was carried to Forlì Cathedral. Like the majority of prints before approximately 1460, only a single impression of this print has survived, Woodcut blocks are printed with light pressure, and are capable of printing several thousand impressions, and even at this period some prints may well have been produced in that quantity. Many prints were hand-coloured, mostly in watercolour, in fact the hand-colouring of prints continued for many centuries, Italy, Germany, France and the Netherlands were the main areas of production, England does not seem to have produced any prints until about 1480
5.
Magazine
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A magazine is a publication, usually a periodical publication, which is printed or electronically published. Magazines are generally published on a schedule and contain a variety of content. They are generally financed by advertising, by a price, by prepaid subscriptions. At its root, the magazine refers to a collection or storage location. In the case of written publication, it is a collection of written articles and this explains why magazine publications share the word root with gunpowder magazines, artillery magazines, firearms magazines, and, in French, retail stores such as department stores. By definition, a magazine paginates with each issue starting at three, with the standard sizing being 8 3/8 ×10 7/8 inches. However, in the sense a journal has continuous pagination throughout a volume. Some professional or trade publications are also peer-reviewed, an example being the Journal of Accountancy, academic or professional publications that are not peer-reviewed are generally professional magazines. That a publication calls itself a journal does not make it a journal in the technical sense, magazines can be distributed through the mail, through sales by newsstands, bookstores, or other vendors, or through free distribution at selected pick-up locations. The subscription business models for distribution fall into three main categories. In this model, the magazine is sold to readers for a price, either on a basis or by subscription. Paid circulation allows for defined readership statistics and this means that there is no cover price and issues are given away, for example in street dispensers, airline, or included with other products or publications. Because this model involves giving issues away to unspecific populations, the statistics only entail the number of issues distributed and this is the model used by many trade magazines distributed only to qualifying readers, often for free and determined by some form of survey. This allows a level of certainty that advertisements will be received by the advertisers target audience. This latter model was used before the rise of the World Wide Web and is still employed by some titles. For example, in the United Kingdom, a number of computer-industry magazines use this model, including Computer Weekly and Computing, for the global media industry, an example would be VideoAge International. The earliest example of magazines was Erbauliche Monaths Unterredungen, a literary and philosophy magazine, the Gentlemans Magazine, first published in 1731, in London was the first general-interest magazine. Edward Cave, who edited The Gentlemans Magazine under the pen name Sylvanus Urban, was the first to use the term magazine, founded by Herbert Ingram in 1842, The Illustrated London News was the first illustrated magazine
6.
Painting
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Painting is the practice of applying paint, pigment, color or other medium to a solid surface. The medium is commonly applied to the base with a brush, but other implements, such as knives, sponges, Painting is a mode of creative expression, and the forms are numerous. Drawing, gesture, composition, narration, or abstraction, among other aesthetic modes, may serve to manifest the expressive, Paintings can be naturalistic and representational, photographic, abstract, narrative, symbolistic, emotive, or political in nature. A portion of the history of painting in both Eastern and Western art is dominated by motifs and ideas. In art, the term painting describes both the act and the result of the action, the term painting is also used outside of art as a common trade among craftsmen and builders. What enables painting is the perception and representation of intensity, every point in space has different intensity, which can be represented in painting by black and white and all the gray shades between. In practice, painters can articulate shapes by juxtaposing surfaces of different intensity, thus, the basic means of painting are distinct from ideological means, such as geometrical figures, various points of view and organization, and symbols. In technical drawing, thickness of line is ideal, demarcating ideal outlines of an object within a perceptual frame different from the one used by painters. Color and tone are the essence of painting as pitch and rhythm are the essence of music, color is highly subjective, but has observable psychological effects, although these can differ from one culture to the next. Black is associated with mourning in the West, but in the East, some painters, theoreticians, writers and scientists, including Goethe, Kandinsky, and Newton, have written their own color theory. Moreover, the use of language is only an abstraction for a color equivalent, the word red, for example, can cover a wide range of variations from the pure red of the visible spectrum of light. There is not a register of different colors in the way that there is agreement on different notes in music. For a painter, color is not simply divided into basic, painters deal practically with pigments, so blue for a painter can be any of the blues, phthalocyanine blue, Prussian blue, indigo, cobalt, ultramarine, and so on. Psychological and symbolical meanings of color are not, strictly speaking, colors only add to the potential, derived context of meanings, and because of this, the perception of a painting is highly subjective. The analogy with music is quite clear—sound in music is analogous to light in painting, shades to dynamics and these elements do not necessarily form a melody of themselves, rather, they can add different contexts to it. Modern artists have extended the practice of painting considerably to include, as one example, collage, some modern painters incorporate different materials such as sand, cement, straw or wood for their texture. Examples of this are the works of Jean Dubuffet and Anselm Kiefer, there is a growing community of artists who use computers to paint color onto a digital canvas using programs such as Adobe Photoshop, Corel Painter, and many others. These images can be printed onto traditional canvas if required, rhythm is important in painting as it is in music
7.
Steel engraving
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Steel engraving is a technique for printing illustrations based on steel instead of copper. It has been used in artistic printmaking, although it was much used for reproductions in the 19th century. Steel engraving was introduced in 1792 by Jacob Perkins, an American inventor, for banknote printing, the new technique only partially replaced the other commercial techniques of that time such as woodcut, wood engraving, copper engraving and later lithography. All the illustrations in the Encyclopædia Britannica of 1911 are steel engravings, Engraving is done with a burin, which is a small bar of hardened steel with a sharp point. It is pushed along the plate to produce thin furrowed lines and this is followed by the use of a scraper to remove any burs, since they would be an impediment during the subsequent inking process. Steel plates are very hard for this technique, which is used on softer copper plates. So steel engraving also used etching, where acid creates the lines in the plates in the pattern made by removing a thin coating of acid-resistant ground by tools. Roulettes of different types were used together with the burin and needle to create densely packed marks which appear as tonal to the eye, true burin engraving was generally used to finish the etched image. First a broad, general outline is made on the plate before starting the detailed image, Engraving will produce a printed reverse or mirror image of the image on the plate. Steel plates can be hardened to ensure that they can print thousands of times with little wear. From about 1860 the steel-facing of copper plates became widely used and it can be very difficult to distinguish between engravings on steel and steel-faced copper, other than by date. The most reliable way of distinguishing between unfaced copper engraving and steel or steel-faced engraving is the lightness and delicacy of the lines in the latter. Until around 1820 copper plates were the medium used for engraving. Copper, being a metal, was easy to carve or engrave. Engravers then reworked a worn plate by retracing the previous engraving to sharpen the image again, another advantage to using copper is that it is a soft metal and can be corrected or updated with a reasonable amount of effort. For this reason, copper plates were the medium of printing for mapmakers. During the 1820s steel began to copper as the preferred medium of commercial publishers for illustration. Steel engraving produced plates with shaper, harder, more distinct lines, also, the harder steel plates produced much longer wearing dies that could strike thousands of copies before they would need any repair or refurbishing engraving
8.
Etching
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Etching is traditionally the process of using strong acid or mordant to cut into the unprotected parts of a metal surface to create a design in intaglio in the metal. In modern manufacturing, other chemicals may be used on other types of material, as a method of printmaking, it is, along with engraving, the most important technique for old master prints, and remains in wide use today. In a number of variants such as microfabrication etching and photochemical milling it is a crucial technique in much modern technology. In traditional pure etching, a plate is covered with a waxy ground which is resistant to acid. The artist then scratches off the ground with an etching needle where he or she wants a line to appear in the finished piece. The échoppe, a tool with an oval section, is also used for swelling lines. The plate is dipped in a bath of acid, technically called the mordant or etchant. The acid bites into the metal where it is exposed, leaving behind lines sunk into the plate, the remaining ground is then cleaned off the plate. The plate is inked all over, and then the ink wiped off the surface, the plate is then put through a high-pressure printing press together with a sheet of paper. The paper picks up the ink from the lines, making a print. The process can be repeated many times, typically several hundred impressions could be printed before the shows much sign of wear. The work on the plate can also be added to by repeating the whole process, Etching has often been combined with other intaglio techniques such as engraving or aquatint. The process as applied to printmaking is believed to have been invented by Daniel Hopfer of Augsburg, Hopfer was a craftsman who decorated armour in this way, and applied the method to printmaking, using iron plates. Apart from his prints, there are two examples of his work on armour, a shield from 1536 now in the Real Armeria of Madrid. The switch to copper plates was made in Italy. On the other hand, the handling of the ground and acid need skill and experience, prior to 1100 AD, the New World Hohokam independently utilized the technique of acid etching in marine shell designs. Jacques Callot from Nancy in Lorraine made important technical advances in etching technique and he developed the échoppe, a type of etching-needle with a slanting oval section at the end, which enabled etchers to create a swelling line, as engravers were able to do. Callot also appears to have responsible for an improved, harder, recipe for the etching ground
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Photography
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Typically, a lens is used to focus the light reflected or emitted from objects into a real image on the light-sensitive surface inside a camera during a timed exposure. With an electronic sensor, this produces an electrical charge at each pixel. A negative image on film is used to photographically create a positive image on a paper base, known as a print. The word photography was created from the Greek roots φωτός, genitive of φῶς, light and γραφή representation by means of lines or drawing, several people may have coined the same new term from these roots independently. Johann von Maedler, a Berlin astronomer, is credited in a 1932 German history of photography as having used it in an article published on 25 February 1839 in the German newspaper Vossische Zeitung. Both of these claims are now widely reported but apparently neither has ever been confirmed as beyond reasonable doubt. Credit has traditionally given to Sir John Herschel both for coining the word and for introducing it to the public. Photography is the result of combining several technical discoveries, later Greek mathematicians Aristotle and Euclid also independently described a pinhole camera in the 5th and 4th centuries BCE. Daniele Barbaro described a diaphragm in 1566, wilhelm Homberg described how light darkened some chemicals in 1694. The fiction book Giphantie, published in 1760, by French author Tiphaigne de la Roche, the discovery of the camera obscura that provides an image of a scene dates back to ancient China. Leonardo da Vinci mentions natural camera obscura that are formed by dark caves on the edge of a sunlit valley, a hole in the cave wall will act as a pinhole camera and project a laterally reversed, upside down image on a piece of paper. So the birth of photography was primarily concerned with inventing means to capture, renaissance painters used the camera obscura which, in fact, gives the optical rendering in color that dominates Western Art. The camera obscura literally means dark chamber in Latin and it is a box with a hole in it which allows light to go through and create an image onto the piece of paper. Around the year 1800, British inventor Thomas Wedgwood made the first known attempt to capture the image in a camera obscura by means of a light-sensitive substance and he used paper or white leather treated with silver nitrate. The shadow images eventually darkened all over, the first permanent photoetching was an image produced in 1822 by the French inventor Nicéphore Niépce, but it was destroyed in a later attempt to make prints from it. Niépce was successful again in 1825, in 1826 or 1827, he made the View from the Window at Le Gras, the earliest surviving photograph from nature. Because Niépces camera photographs required a long exposure, he sought to greatly improve his bitumen process or replace it with one that was more practical. With an eye to eventual commercial exploitation, the partners opted for total secrecy, Daguerres efforts culminated in what would later be named the daguerreotype process
10.
Printmaking
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Printmaking is the process of making artworks by printing, normally on paper. Printmaking normally covers only the process of creating prints that have an element of originality, except in the case of monotyping, the process is capable of producing multiples of the same piece, which is called a print. Each print produced is not considered a copy but rather is considered an original, a print may be known as an impression. Printmaking is not chosen only for its ability to multiple impressions. Prints are created by transferring ink from a matrix or through a screen to a sheet of paper or other material. Screens made of silk or synthetic fabrics are used for the screenprinting process, other types of matrix substrates and related processes are discussed below. Multiple impressions printed from the matrix form an edition. Prints may also be printed in book form, such as illustrated books or artists books, Printmaking techniques are generally divided into the following basic categories, Relief, where ink is applied to the original surface of the matrix. Relief techniques include woodcut or woodblock as the Asian forms are known, wood engraving. Intaglio, where ink is applied beneath the surface of the matrix. Intaglio techniques include engraving, etching, mezzotint, aquatint, planographic, where the matrix retains its original surface, but is specially prepared and/or inked to allow for the transfer of the image. Planographic techniques include lithography, monotyping, and digital techniques, stencil, where ink or paint is pressed through a prepared screen, including screenprinting and pochoir. Other types of printmaking techniques outside these groups include collagraphy and viscosity printing, collagraphy is a printmaking technique in which textured material is adhered to the printing matrix. This texture is transferred to the paper during the printing process, Contemporary printmaking may include digital printing, photographic mediums, or a combination of digital, photographic, and traditional processes. Many of these techniques can also be combined, especially within the same family, for example, Rembrandts prints are usually referred to as etchings for convenience, but very often include work in engraving and drypoint as well, and sometimes have no etching at all. Woodcut, a type of print, is the earliest printmaking technique. It was probably first developed as a means of printing patterns on cloth, woodcuts of images on paper developed around 1400 in Japan, and slightly later in Europe. These are the two areas where woodcut has been most extensively used purely as a process for making images without text, the artist draws a design on a plank of wood, or on paper which is transferred to the wood
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Intaglio (printmaking)
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Intaglio is the family of printing and printmaking techniques in which the image is incised into a surface and the incised line or sunken area holds the ink. It is the direct opposite of a relief print, normally, copper or zinc plates are used as a surface or matrix, and the incisions are created by etching, engraving, drypoint, aquatint or mezzotint. Collagraphs may also be printed as intaglio plates, in etching, for example, the plate is covered in a resin ground or an acid-resistant wax material. Using an etching needle, or a tool, the image is engraved into the ground. The plate is dipped into acid. The acid bites into the surface of the plate where it was exposed, biting is a printmaking term to describe the acids etching, or incising, of the image. After the plate is bitten, the plate is removed from the acid bath. To print an intaglio plate, ink is applied to the surface by wiping and/or dabbing the plate to push the ink into the recessed lines, the plate is then rubbed with tarlatan cloth to remove most of the excess ink. The final smooth wipe is often done with newspaper or old public phone book pages, a damp piece of paper is placed on top of the plate, so that when going through the press the damp paper will be able to be squeezed into the plates ink-filled grooves. The paper and plate are covered by a thick blanket to ensure even pressure when going through the rolling press. The rolling press applies very high pressure through the blanket to push the paper into the grooves on the plate, the blanket is then lifted, revealing the paper and printed image. Martin Schongauer was one of the earliest known artists to exploit the copper-engraving technique, italian and Netherlandish engraving began slightly after the Germans, but were well developed by 1500. Drypoint and etching were also German inventions of the century, probably by the Housebook Master. In the nineteenth century, Viennese printer Karel Klíč introduced a combined intaglio, photogravure retained the smooth continuous tones of photography but was printed using a chemically-etched copper plate. This permitted a photographic image to be printed on regular paper, at one time intaglio printing was used for all mass-printed materials including banknotes, stock certificates, newspapers and magazines, fabrics, wallpapers and sheet music. Today intaglio engraving is largely used for paper or plastic currency, banknotes, passports, photogravure, an intaglio photo-printmaking process Rotogravure Line engraving Viscosity printing History of printing Intaglio and other printmaking definitions
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Wood engraving
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Wood engraving is a printmaking and letterpress printing technique, in which an artist works an image or matrix of images into a block of wood. Functionally a variety of woodcut, it uses relief printing, where the artist applies ink to the face of the block and prints using relatively low pressure. By contrast, ordinary engraving, like etching, uses a metal plate for the matrix, and is printed by the method, where the ink fills the valleys. As a result, wood engravings deteriorate less quickly than copper-plate engravings, Thomas Bewick developed the wood engraving technique at the end of the 18th century. His work differed from earlier woodcuts in two key ways, first, rather than using woodcarving tools such as knives, Bewick used an engravers burin. With this, he could create thin delicate lines, often creating large areas in the composition. Second, wood engraving traditionally uses the woods end grain—while the older technique used the side grain. The resulting increased hardness and durability facilitated more detailed images, wood-engraved blocks could be used on conventional printing presses, which were going through rapid mechanical improvements during the first quarter of the 19th century. The blocks were made the same height as, and composited alongside, the combination of this new wood engraving method and mechanized printing drove a rapid expansion of illustrations in the 19th century. Further, advances in stereotype let wood-engravings be reproduced onto metal, by the mid-19th century, many wood engravings rivaled copperplate engravings. In 15th and 16th-century Europe, woodcuts were a technique in printmaking and printing. They were still made for printing press work such as newspapers or almanacs. The beginnings of modern wood engraving techniques developed at the end of the 18th and beginning of the 19th century, Bewick generally engraved harder woods, such as boxwood, rather than the woods used in woodcuts, and he engraved the ends of blocks instead of the side. Finding a woodcutting knife not suitable for working against the grain in harder woods, Bewick used a burin, from the beginning of the nineteenth century Bewicks techniques gradually came into wider use, especially in Britain and the United States. Alexander Anderson introduced the technique to the United States, Bewicks work impressed him, so he reverse engineered and imitated Bewicks technique—using metal until he learned that Bewick used wood. This was, in ways a unnatural application, since engravers had to cut away almost all the surface of the block to produce the printable lines of the artists drawing. Nonetheless, it became the most common use of wood engraving, in the United States, wood-engraved publications also began to take hold, such as Harpers Weekly. A single design was divided into a grid, and each worked on a square
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Relief printing
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Relief printing is a process where protruding surface faces of the printing plate or block are inked, recessed areas are ink free. Printing the image is therefore a simple matter of inking the face of the matrix. A printing-press may not be needed as the back of the paper can be rubbed or pressed by hand with a tool such as a brayer or roller. The matrix in relief printing is classically created by starting with a flat original surface, the remaining areas of the original surface receive the ink. The relief family of techniques includes woodcut, metalcut, wood engraving, relief etching, linocut, rubber stamp, foam printing, potato printing, traditional text printing with movable type is also a relief technique. This meant that woodcuts were much easier to use as book illustrations, intaglio illustrations, such as engravings, had to be printed separately. Relief printing is one of the families of printmaking techniques, along with the intaglio. Modern developments have created other types, in contrast, in the intaglio process the recessed areas are the printed areas. The whole matrix is inked, and the ink then wiped away from the surface, much greater pressure is then needed to force the paper into the channels containing the ink, and a high-pressure press will normally be required. Intaglio techniques include engraving, etching, and drypoint, with planographic techniques, such as lithography, the entire surface of the matrix is flat, and some areas are treated to create the print image. Normally relief and intaglio techniques can only be mixed with others of the family in the same work. See also Relief printing techniques as used and described by French printmaker Dominique Lecomte
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Aztec
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The Aztec people were certain ethnic groups of central Mexico, particularly those groups who spoke the Nahuatl language and who dominated large parts of Mesoamerica from the 14th to 16th centuries. The Nahuatl words aztecatl and aztecah mean people from Aztlan, a place for the Nahuatl-speaking culture of the time. Often the term Aztec refers exclusively to the Mexica people of Tenochtitlan, situated on an island in Lake Texcoco, who referred to themselves as Mēxihcah Tenochcah or Cōlhuah Mexihcah. From the 13th century, the Valley of Mexico was the heart of Aztec civilization, here the capital of the Aztec Triple Alliance, the Triple Alliance formed a tributary empire expanding its political hegemony far beyond the Valley of Mexico, conquering other city states throughout Mesoamerica. At its pinnacle, Aztec culture had rich and complex mythological and religious traditions, as well as achieving remarkable architectural and artistic accomplishments. Subsequently, the Spanish founded the new settlement of Mexico City on the site of the ruined Aztec capital, the term extends to further ethnic groups associated with the Aztec empire such as the Acolhua and Tepanec and others that were incorporated into the empire. In older usage the term was used about modern Nahuatl speaking ethnic groups. In recent usage these ethnic groups are referred to as the Nahua peoples. Linguistically the term Aztecan is still used about the branch of the Uto-Aztecan languages that includes the Nahuatl language and its closest relatives Pochutec, to the Aztecs themselves the word aztec was not an endonym for any particular ethnic group. Rather it was a term used to refer to several ethnic groups, not all of them Nahuatl speaking. In the Nahuatl language aztecatl means person from Aztlan and this usage has been the subject of debate in more recent years, but the term Aztec is still more common. For the same reason the notion of Aztec civilization is best understood as a horizon of a general Mesoamerican civilization. Particular to the Aztecs of Tenochtitlan was the Mexica patron God Huitzilopochtli, twin pyramids, the Aztec Empire was a tribute empire based in Tenochtitlan that extended its power throughout Mesoamerica in the late postclassic period. Soon Texcoco and Tlacopan became junior partners in the alliance, which was de facto led by the Mexica of Tenochtitlan, the empire extended its power by a combination of trade and military conquest. The political clout of the empire reached far south into Mesoamerica conquering cities as far south as Chiapas and Guatemala, the Nahua peoples began to migrate into Mesoamerica from northern Mexico in the 6th century. They populated central Mexico, dislocating speakers of Oto-Manguean languages as they spread their influence south. As the former nomadic hunter-gatherer peoples mixed with the civilizations of Mesoamerica, adopting religious and cultural practices. During the Postclassic period they rose to power at such sites as Tula, in the 12th century the Nahua power center was in Azcapotzalco, from where the Tepanecs dominated the valley of Mexico
15.
Alexander von Humboldt
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Friedrich Wilhelm Heinrich Alexander von Humboldt was a Prussian geographer, naturalist, explorer, and influential proponent of Romantic philosophy and science. He was the brother of the Prussian minister, philosopher. Humboldts quantitative work on botanical geography laid the foundation for the field of biogeography, Humboldts advocacy of long-term systematic geophysical measurement laid the foundation for modern geomagnetic and meteorological monitoring. Between 1799 and 1804, Humboldt travelled extensively in Latin America and his description of the journey was written up and published in an enormous set of volumes over 21 years. Humboldt was one of the first people to propose that the lands bordering the Atlantic Ocean were once joined and this important work also motivated a holistic perception of the universe as one interacting entity. Alexander von Humboldt was born in Berlin in Prussia on 14 September 1769 and he was baptized as a baby in the Lutheran faith, with the Duke of Brunswick serving as godfather. At age 42, Alexander Georg was rewarded for his services in the Seven Years War with the post of Royal Chamberlain and he profited from the contract to lease state lotteries and tobacco sales. He first married the daughter of Prussian General Adjutant Schweder, in 1766, Alexander Georg married Maria Elisabeth Colomb, a well-educated woman and widow of Baron Hollwede, with whom she had a son. Alexander Georg and Maria Elisabeth had three children, a daughter, who died young, and then two sons, Wilhelm and Alexander and her first-born son, Wilhelms and Alexanders half-brother, was something of a neer do well, not often mentioned in the family history. Alexander Georg died in 1779, leaving the brothers Humboldt in the care of their emotionally distant mother, Humboldts mother expected them to become civil servants of the Prussian state. The money Baron Holwede left to Alexanders mother became, after her death, instrumental in funding Alexanders explorations, due to his youthful penchant for collecting and labeling plants, shells and insects, Alexander received the playful title of the little apothecary. On April 25,1789, he matriculated at Göttingen, then known for the lectures of C. G. Heyne and his brother Wilhelm was already a student at Göttingen, but they did not interact much since their intellectual interests were quite different. His vast and varied interests were by this time fully developed, at Göttingen he met Georg Forster, a naturalist who had been with Captain James Cook on his second voyage. Humboldt traveled with Forster in Europe, the two traveled to England, Humboldts first sea voyage, The Netherlands, and France. In England, he met Sir Joseph Banks, President of the Royal Society, the scientific friendship between Banks and Humboldt lasted until Bankss death in 1820, and the two shared botanical specimens for study. Banks also mobilized his scientific contacts in later years to aid Humboldts work, Humboldts scientific excursion up the Rhine resulted in his 1790 treatise Mineralogische Beobachtungen über einige Basalte am Rhein. Humboldts passion for travel was of long standing, Humboldts talents were devoted to the purpose of preparing himself as a scientific explorer. During this period, his brother Wilhelm married, but Alexander did not attend the nuptials, Humboldt graduated from the Freiberg School of Mines in 1792 and was appointed to a Prussian government position in the Department of Mines as an inspector in Bayreuth and the Fichtel mountains
16.
Mexico
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Mexico, officially the United Mexican States, is a federal republic in the southern half of North America. It is bordered to the north by the United States, to the south and west by the Pacific Ocean, to the southeast by Guatemala, Belize, and the Caribbean Sea, and to the east by the Gulf of Mexico. Covering almost two million square kilometers, Mexico is the sixth largest country in the Americas by total area, Mexico is a federation comprising 31 states and a federal district that is also its capital and most populous city. Other metropolises include Guadalajara, Monterrey, Puebla, Toluca, Tijuana, pre-Columbian Mexico was home to many advanced Mesoamerican civilizations, such as the Olmec, Toltec, Teotihuacan, Zapotec, Maya and Aztec before first contact with Europeans. In 1521, the Spanish Empire conquered and colonized the territory from its base in Mexico-Tenochtitlan, Three centuries later, this territory became Mexico following recognition in 1821 after the colonys Mexican War of Independence. The tumultuous post-independence period was characterized by instability and many political changes. The Mexican–American War led to the cession of the extensive northern borderlands, one-third of its territory. The Pastry War, the Franco-Mexican War, a civil war, the dictatorship was overthrown in the Mexican Revolution of 1910, which culminated with the promulgation of the 1917 Constitution and the emergence of the countrys current political system. Mexico has the fifteenth largest nominal GDP and the eleventh largest by purchasing power parity, the Mexican economy is strongly linked to those of its North American Free Trade Agreement partners, especially the United States. Mexico was the first Latin American member of the Organisation for Economic Co-operation and Development and it is classified as an upper-middle income country by the World Bank and a newly industrialized country by several analysts. By 2050, Mexico could become the fifth or seventh largest economy. The country is considered both a power and middle power, and is often identified as an emerging global power. Due to its culture and history, Mexico ranks first in the Americas. Mexico is a country, ranking fourth in the world by biodiversity. In 2015 it was the 9th most visited country in the world, Mexico is a member of the United Nations, the World Trade Organization, the G8+5, the G20, the Uniting for Consensus and the Pacific Alliance. Mēxihco is the Nahuatl term for the heartland of the Aztec Empire, namely, the Valley of Mexico, and its people, the Mexica and this became the future State of Mexico as a division of New Spain prior to independence. It is generally considered to be a toponym for the valley became the primary ethnonym for the Aztec Triple Alliance as a result. After New Spain won independence from Spain, representatives decided to name the new country after its capital and this was founded in 1524 on top of the ancient Mexica capital of Mexico-Tenochtitlan
17.
John Flaxman
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John Flaxman R. A. was a British sculptor and draughtsman, and a leading figure in British and European Neoclassicism. Early in his career he worked as a modeller for Josiah Wedgwoods pottery and he spent several years in Rome, where he produced his first book illustrations. He was a maker of funerary monuments. His father, also named John, was known as a moulder and seller of plaster casts at the sign of the Golden Head, New Street, Covent Garden. His wifes maiden name was Lee, and they had two children, William and John, within six months of Johns birth the family returned to London. He was a child, high-shouldered, with a head too large for his body. His mother died when he was nine, and his father remarried and he had little schooling, and was largely self-educated. He took delight in drawing and modelling from his fathers stock-in-trade and his fathers customers helped him with books, advice, and later with commissions. Particularly significant were the painter George Romney, and a clergyman, Anthony Stephen Mathew. In the same year,1770, he entered the Academy as a student, in the competition for the gold medal of the Academy in 1772, however, Flaxman was defeated, the prize being awarded by the president, Sir Joshua Reynolds, to a competitor named Engleheart. This episode seemed to help cure Flaxman of a tendency to conceit which led Thomas Wedgwood V to say of him in 1775, It is and he continued to work diligently, both as a student and as an exhibitor at the Academy, with occasional attempts at painting. To the Academy he contributed a wax model of Neptune, four models in wax, a terracotta bust, a wax figure of a child, an historical figure, a figure of Comedy. During this period he received a commission from a friend of the Mathew family for a statue of Alexander the Great, but he was unable to obtain a regular income from private contracts. From 1775 he was employed by the potter Josiah Wedgwood and his partner Bentley, for whom his father had also some work. The usual procedure was to model the reliefs in wax on slate or glass grounds before they cast for production, dHancarvilles engravings of Sir William Hamiltons collection of ancient Greek vases were an important influence on his work. By 1780 Flaxman had also begun to earn money by sculpting grave monuments, during the rest of Flaxmans career memorial bas-reliefs of this type made up the bulk of his output, and are to be found in many churches throughout England. One example, the monument to George Steevens, originally in St Matthais Old Church, is now in the Fitzwilliam Museum, in 1782, aged 27, Flaxman married Anne Denman, who was to assist him throughout his career. She was well-educated, and a devoted companion and they set up house in Wardour Street, and usually spent their summer holidays as guests of the poet William Hayley, at Eartham in Sussex
18.
Cutting
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Cutting is the separation of a physical object, into two or more portions, through the application of an acutely directed force. Implements commonly used for cutting are the knife and saw, or in medicine and science the scalpel, however, any sufficiently sharp object is capable of cutting if it has a hardness sufficiently larger than the object being cut, and if it is applied with sufficient force. Even liquids can be used to cut things when applied with sufficient force, cutting is a compressive and shearing phenomenon, and occurs only when the total stress generated by the cutting implement exceeds the ultimate strength of the material of the object being cut. Hence, the smaller the area, the force is needed to cut something. It is generally seen that cutting edges are thinner for cutting soft materials and this progression is seen from kitchen knife, to cleaver, to axe, and is a balance between the easy cutting action of a thin blade vs strength and edge durability of a thicker blade. Cutting has been at the core of manufacturing throughout history, for metals many methods are used and can be grouped by the physical phenomenon used. Chip forming - sawing, drilling, milling, turning etc, abrading - grinding, lapping, polishing, water-jet. Heat - flame cutting, plasma cutting, laser cutting, electrochemical - etching, electrical discharge machining. Every method has its limitations in accuracy, cost, and effect on the material, for example, heat may damage the quality of heat treated alloys, and laser cutting is less suitable for highly reflective materials such as aluminum. Laser cutting sheet metal produces flat parts and etches and engraves parts from complex or simple designs and it is used over other cutting options for its quick process and customizable abilities
19.
Goldsmith
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A goldsmith is a metalworker who specializes in working with gold and other precious metals. Goldsmiths must be skilled in forming metal through filing, soldering, sawing, forging, casting, the trade has very often included jewellery-making skills, as well as the very similar skills of the silversmith. Many universities and junior colleges also offer goldsmithing, silversmithing, compared to other metals, gold is malleable, ductile, rare, and it is the only solid metallic element with a yellow color. It may easily be melted, fused, and cast without the problems of oxides and gas that are problematic with other such as bronzes. It is fairly easy to weld, wherein similarly to clay two small pieces may be pounded together to make one larger piece. Gold is classified as a noble metal—because it does not react with most elements and it usually is found in its native form, lasting indefinitely without oxidization and tarnishing. Gold has been worked by humans in all cultures where the metal is available, either indigenously or imported, and the history of these activities is extensive. Superbly made objects from the ancient cultures of Africa, Asia, Europe, India, North America, Mesoamerica, some pieces date back thousands of years and were made using many techniques that still are used by modern goldsmiths. Techniques developed by some of those goldsmiths achieved a level that was lost and remained beyond the skills of those who followed. In medieval Europe goldsmiths were organized into guilds and usually were one of the most important, the guild kept records of members and the marks they used on their products. These records, when they survive, are useful to historians. Goldsmiths often acted as bankers, since they dealt in gold and had sufficient security for the storage of valuable items. The Sunar caste is one of the oldest communities in goldsmithing in India, in India, Vishwakarma are the goldsmith caste. The printmaking technique of engraving developed among goldsmiths in Germany around 1430, the notable engravers of the fifteenth century were either goldsmiths, such as Master E. S. or the sons of goldsmiths, such as Martin Schongauer and Albrecht Dürer. A goldsmith might have an array of skills and knowledge at their disposal. Gold, being the most malleable metal of all, offers opportunities for the worker. In todays world a variety of other metals, especially platinum alloys. 24 Carat is pure gold and historically, was known as fine gold, because it is so soft, however,24 Carat gold is rarely used
20.
Florence
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Florence is the capital city of the Italian region of Tuscany and of the Metropolitan City of Florence. It is the most populous city in Tuscany, with 383,083 inhabitants, Florence was a centre of medieval European trade and finance and one of the wealthiest cities of the time. It is considered the birthplace of the Renaissance, and has called the Athens of the Middle Ages. A turbulent political history includes periods of rule by the powerful Medici family, from 1865 to 1871 the city was the capital of the recently established Kingdom of Italy. The Historic Centre of Florence attracts 13 million tourists each year and it was declared a World Heritage Site by UNESCO in 1982. The city is noted for its culture, Renaissance art and architecture, the city also contains numerous museums and art galleries, such as the Uffizi Gallery and the Palazzo Pitti, and still exerts an influence in the fields of art, culture and politics. Due to Florences artistic and architectural heritage, it has been ranked by Forbes as one of the most beautiful cities in the world, in 2008, the city had the 17th highest average income in Italy. Florence originated as a Roman city, and later, after a period as a flourishing trading and banking medieval commune. According to the Encyclopædia Britannica, it was politically, economically, and culturally one of the most important cities in Europe, the language spoken in the city during the 14th century was, and still is, accepted as the Italian language. Starting from the late Middle Ages, Florentine money—in the form of the gold florin—financed the development of all over Europe, from Britain to Bruges, to Lyon. Florentine bankers financed the English kings during the Hundred Years War and they similarly financed the papacy, including the construction of their provisional capital of Avignon and, after their return to Rome, the reconstruction and Renaissance embellishment of Rome. Florence was home to the Medici, one of European historys most important noble families, Lorenzo de Medici was considered a political and cultural mastermind of Italy in the late 15th century. Two members of the family were popes in the early 16th century, Leo X, catherine de Medici married king Henry II of France and, after his death in 1559, reigned as regent in France. Marie de Medici married Henry IV of France and gave birth to the future king Louis XIII, the Medici reigned as Grand Dukes of Tuscany, starting with Cosimo I de Medici in 1569 and ending with the death of Gian Gastone de Medici in 1737. The Etruscans initially formed in 200 BC the small settlement of Fiesole and it was built in the style of an army camp with the main streets, the cardo and the decumanus, intersecting at the present Piazza della Repubblica. Situated along the Via Cassia, the route between Rome and the north, and within the fertile valley of the Arno, the settlement quickly became an important commercial centre. Peace returned under Lombard rule in the 6th century, Florence was conquered by Charlemagne in 774 and became part of the Duchy of Tuscany, with Lucca as capital. The population began to again and commerce prospered
21.
Vitreous enamel
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Vitreous enamel, also called porcelain enamel, is a material made by fusing powdered glass to a substrate by firing, usually between 750 and 850 °C. The powder melts, flows, and then hardens to a smooth, durable vitreous coating on metal, so in technical terms fired enamelware is an integrated layered composite of glass and metal. Enamelling is an old and widely adopted technology, for most of its history mainly used in jewelry, enamelled and enamelling are the preferred spellings in British English, while enameled and enameling are preferred in American English. The term enamel is most often restricted to work on metal, enamelled glass is also called painted, and overglaze decoration to pottery is often called enamelling. The word enamel comes from the Old High German word smelzan via the Old French esmail, or from a Latin word smaltum, used as a noun, an enamel is usually a small decorative object coated with enamel. Since the 19th century the term also to industrial materials and many metal consumer objects, such as some cooking vessels, dishwashers, laundry machines, sinks. The ancient Egyptians applied enamels to stone objects, pottery, and sometimes jewellery, the ancient Greeks, Celts, Georgians, and Chinese also used enamel on metal objects. Enamel powder could be produced in two ways, either by powdering coloured glass, or by mixing colourless glass powder with pigments such as a metallic oxide, designs were either painted freehand or over the top of outline incisions, and the technique probably originated in metalworking. Once painted, enamelled glass vessels needed to be fired at a high enough to melt the applied powder. Ancient Persians used this method for colouring and ornamenting the surface of metals by fusing over it brilliant colours that are decorated in an intricate design and called it Meenakari. Gold has been used traditionally for Meenakari Jewellery as it holds the enamel better, lasts longer, initially, the work of Meenakari often went unnoticed as this art was traditionally used as a backing for the famous kundan or stone-studded jewellery. This also allowed the wearer to reverse the jewellery as also promised a special joy in the secret of the hidden design, the Byzantine enamel style was widely adopted by the barbarian peoples of Migration Period northern Europe. The Byzantines then began to use cloisonné more freely to create images, the champlevé technique was considerably easier and very widely practiced in the Romanesque period. In Gothic art the finest work is in basse-taille and ronde-bosse techniques, from either Byzantium or the Islamic world, the cloisonné technique reached China in the 13-14th centuries. The first written reference to cloisonné is in a book from 1388, cloisonné remained very popular in China until the 19th century and is still produced today. Starting from the century, the Japanese also produced large quantities of very high technical quality. A resurgence in enamel-based art took place near the end of the 20th century in the Soviet Union, led by artists like Alexei Maximov, in Australia, abstract artist Bernard Hesling brought the style into prominence with his variously sized steel plates. Enamel was first applied commercially to sheet iron and steel in Austria, industrialization increased as the purity of raw materials increased and costs decreased
22.
Silver
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Silver is a metallic element with symbol Ag and atomic number 47. The symbol Ag stems from Latin argentum, derived from the Greek ὰργὀς, a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. The metal is found in the Earths crust in the pure, free form, as an alloy with gold and other metals. Most silver is produced as a byproduct of copper, gold, lead, Silver is more abundant than gold, but it is much less abundant as a native metal. Its purity is measured on a per mille basis, a 94%-pure alloy is described as 0.940 fine. As one of the seven metals of antiquity, silver has had a role in most human cultures. Silver has long valued as a precious metal. Silver metal is used in many premodern monetary systems in bullion coins, Silver is used in numerous applications other than currency, such as solar panels, water filtration, jewelry, ornaments, high-value tableware and utensils, and as an investment medium. Silver is used industrially in electrical contacts and conductors, in specialized mirrors, window coatings, Silver compounds are used in photographic film and X-rays. Dilute silver nitrate solutions and other compounds are used as disinfectants and microbiocides, added to bandages and wound-dressings, catheters. Silver is similar in its physical and chemical properties to its two neighbours in group 11 of the periodic table, copper and gold. This distinctive electron configuration, with an electron in the highest occupied s subshell over a filled d subshell. Silver is a soft, ductile and malleable transition metal. Silver crystallizes in a cubic lattice with bulk coordination number 12. Unlike metals with incomplete d-shells, metallic bonds in silver are lacking a covalent character and are relatively weak and this observation explains the low hardness and high ductility of single crystals of silver. Silver has a brilliant white metallic luster that can take a polish. Protected silver has greater optical reflectivity than aluminium at all wavelengths longer than ~450 nm, at wavelengths shorter than 450 nm, silvers reflectivity is inferior to that of aluminium and drops to zero near 310 nm. The electrical conductivity of silver is the greatest of all metals, greater even than copper, during World War II in the US,13540 tons of silver were used in electromagnets for enriching uranium, mainly because of the wartime shortage of copper
23.
Lead
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Lead is a chemical element with atomic number 82 and symbol Pb. When freshly cut, it is bluish-white, it tarnishes to a dull gray upon exposure to air and it is a soft, malleable, and heavy metal with a density exceeding that of most common materials. Lead has the second-highest atomic number of the stable elements. Lead is a relatively unreactive post-transition metal and its weak metallic character is illustrated by its amphoteric nature and tendency to form covalent bonds. Compounds of lead are found in the +2 oxidation state. Exceptions are mostly limited to organolead compounds, like the lighter members of the group, lead exhibits a tendency to bond to itself, it can form chains, rings, and polyhedral structures. Lead is easily extracted from its ores and was known to people in Western Asia. A principal ore of lead, galena, often bears silver, Lead production declined after the fall of Rome and did not reach comparable levels again until the Industrial Revolution. Nowadays, global production of lead is about ten million tonnes annually, Lead has several properties that make it useful, high density, low melting point, ductility, and relative inertness to oxidation. In the late 19th century, lead was recognized as poisonous, Lead is a neurotoxin that accumulates in soft tissues and bones, damaging the nervous system and causing brain disorders and, in mammals, blood disorders. A lead atom has 82 electrons, arranged in a configuration of 4f145d106s26p2. The combined first and second ionization energies—the total energy required to remove the two 6p electrons—is close to that of tin, leads upper neighbor in group 14. This is unusual since ionization energies generally fall going down a group as an elements outer electrons become more distant from the nucleus, the similarity is caused by the lanthanide contraction—the decrease in element radii from lanthanum to lutetium, and the relatively small radii of the elements after hafnium. The contraction is due to shielding of the nucleus by the lanthanide 4f electrons. The combined first four ionization energies of lead exceed those of tin, for this reason lead, unlike tin, mostly forms compounds in which it has an oxidation state of +2, rather than +4. Relativistic effects, which become particularly prominent at the bottom of the periodic table, as a result, the 6s electrons of lead become reluctant to participate in bonding, a phenomenon called the inert pair effect. A related outcome is that the distance between nearest atoms in crystalline lead is unusually long, the lighter group 14 elements form stable or metastable allotropes having the tetrahedrally coordinated and covalently bonded diamond cubic structure. The energy levels of their outer s- and p-orbitals are close enough to allow mixing into four hybrid sp3 orbitals
24.
Sulfur
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Sulfur or sulphur is a chemical element with symbol S and atomic number 16. It is abundant, multivalent, and nonmetallic, under normal conditions, sulfur atoms form cyclic octatomic molecules with chemical formula S8. Elemental sulfur is a yellow crystalline solid at room temperature. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, though sometimes found in pure, native form, sulfur usually occurs as sulfide and sulfate minerals. Being abundant in native form, sulfur was known in ancient times, being mentioned for its uses in ancient India, ancient Greece, China, in the Bible, sulfur is called brimstone. Today, almost all elemental sulfur is produced as a byproduct of removing sulfur-containing contaminants from natural gas, the greatest commercial use of the element is the production of sulfuric acid for sulfate and phosphate fertilizers, and other chemical processes. The element sulfur is used in matches, insecticides, and fungicides, many sulfur compounds are odoriferous, and the smells of odorized natural gas, skunk scent, grapefruit, and garlic are due to organosulfur compounds. Hydrogen sulfide gives the characteristic odor to rotting eggs and other biological processes, sulfur is an essential element for all life, but almost always in the form of organosulfur compounds or metal sulfides. Three amino acids and two vitamins are organosulfur compounds, many cofactors also contain sulfur including glutathione and thioredoxin and iron–sulfur proteins. Disulfides, S–S bonds, confer mechanical strength and insolubility of the keratin, found in outer skin, hair. Sulfur is one of the chemical elements needed for biochemical functioning and is an elemental macronutrient for all organisms. Sulfur is derived from the Latin word sulpur, which was Hellenized to sulphur, the spelling sulfur appears toward the end of the Classical period. In 12th-century Anglo-French, it was sulfre, in the 14th century the Latin ph was restored, for sulphre, the parallel f~ph spellings continued in Britain until the 19th century, when the word was standardized as sulphur. Sulfur was the form chosen in the United States, whereas Canada uses both, the IUPAC adopted the spelling sulfur in 1990, as did the Nomenclature Committee of the Royal Society of Chemistry in 1992, restoring the spelling sulfur to Britain. Sulfur forms polyatomic molecules with different chemical formulas, the best-known allotrope being octasulfur, cyclo-S8. The point group of cyclo-S8 is D4d and its dipole moment is 0 D. Octasulfur is a soft, bright-yellow solid that is odorless and it melts at 115.21 °C, boils at 444.6 °C and sublimes easily. At 95.2 °C, below its melting temperature, cyclo-octasulfur changes from α-octasulfur to the β-polymorph, the structure of the S8 ring is virtually unchanged by this phase change, which affects the intermolecular interactions. At higher temperatures, the viscosity decreases as depolymerization occurs, molten sulfur assumes a dark red color above 200 °C
25.
Niello
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Niello is a black mixture of copper, silver, and lead sulphides, used as an inlay on engraved or etched metal. The resulting design, called a niello, was of much higher contrast, during the 10th to 13th century AD, Kievan Rus craftsmen possessed a high degree of skill in jewelry making. John Tsetses, a 12th-century Byzantine writer, praised the work of Kievan Rus artisans and likened their work to the creations of Daedalus, the Kievan Rus technique for niello application was first shaping silver or gold by repoussé work, embossing, and casting. The heat of the furnace would blacken the niello and make the other stand out more vividly. During the Mongol invasion from 1237 to 1240 AD, nearly all of Kievan Rus was overrun, settlements and workshops were burned and razed and most of the craftsmen and artisans were killed. Afterwards, skill in niello and cloisonné enamel diminished greatly, the Ukrainian Museum of Historic Treasures, located in Kiev, has a large collection of nielloed items mostly recovered from tombs found throughout Ukraine. Nielloware jewelry and related items from Thailand were popular gifts from American soldiers taking R&R in Thailand to their girlfriends/wives back home from the 1930s to the 1970s, most of it was completely handmade jewelry. The technique is as follows, The artisan would carve a particular character or pattern into the silver and he would then use the niello inlay to fill in the background. After being baked in a fire, the alloy would harden. It would then be sanded smooth and buffed, finally, a silver artisan would add minute details by hand. Filigree was often used for additional ornamentation, Nielloware is classified as only being black and silver colored. Other colored jewelry originating during this time uses a different technique and is not considered niello, many of the characters shown in nielloware are characters originally found in the Hindu legend Ramayana. The Thai version is called Ramakien, important Thai cultural symbols were also frequently used. Collecting Thai jewelry is a hobby with many jewelry enthusiasts. The Kiev museum of historic treasures, overview of Siam Sterling Nielloware, Tampa, FL Dittell, C. Survey of Siam Sterling Nielloware, Bookbaby Publishers Maryon, Herbert, untracht, Oppi Metal techniques For Craftsmen, New York 1968. The Siam Sterling Nielloware Site Nielloware in Thailand Niello information site
26.
Contrast (vision)
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Contrast is the difference in luminance or colour that makes an object distinguishable. In visual perception of the world, contrast is determined by the difference in the color and brightness of the object. The human visual system is sensitive to contrast than absolute luminance. The maximum contrast of an image is the contrast ratio or dynamic range, the human contrast sensitivity function shows a typical band-pass filter shape peaking at around 4 cycles per degree with sensitivity dropping off either side of the peak. The high-frequency cut-off represents the optical limitations of the systems ability to resolve detail and is typically about 60 cycles per degree. The high-frequency cut-off is related to the density of the retinal photoreceptor cells. The low frequency drop-off is due to lateral inhibition within the ganglion cells. A typical retinal ganglion cell presents a centre region with either excitation or inhibition, one experimental phenomenon is the inhibition of blue in the periphery if blue light is displayed against white, leading to a yellow surrounding. The yellow is derived from the inhibition of blue on the surroundings by the center, since white minus blue is red and green, this mixes to become yellow. For example, in the case of computer displays, contrast depends on the properties of the picture source or file. For some screens the angle between the surface and the observers line of sight is also important. There are many definitions of contrast. Some include color, others do not, travnikova laments, Such a multiplicity of notions of contrast is extremely inconvenient. It complicates the solution of many applied problems and makes it difficult to compare the results published by different authors, various definitions of contrast are used in different situations. Here, luminance contrast is used as an example, but the formulas can also be applied to other physical quantities, in many cases, the definitions of contrast represent a ratio of the type Luminance difference Average luminance. The rationale behind this is that a difference is negligible if the average luminance is high. Below, some definitions are given. Weber contrast is defined as I − I b I b, with I and I b representing the luminance of the features, the measure is also referred to as Weber fraction, since it is the term that is constant in Webers Law
27.
Clay
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Clay is a fine-grained natural rock or soil material that combines one or more clay minerals with traces of metal oxides and organic matter. Geologic clay deposits are composed of phyllosilicate minerals containing variable amounts of water trapped in the mineral structure. Clays are plastic due to water content and become hard, brittle. Depending on the content in which it is found, clay can appear in various colours from white to dull grey or brown to deep orange-red. Although many naturally occurring deposits include both silts and clay, clays are distinguished from other fine-grained soils by differences in size, silts, which are fine-grained soils that do not include clay minerals, tend to have larger particle sizes than clays. There is, however, some overlap in size and other physical properties. The distinction between silt and clay varies by discipline, geologists and soil scientists usually consider the separation to occur at a particle size of 2 µm, sedimentologists often use 4–5 μm, and colloid chemists use 1 μm. Geotechnical engineers distinguish between silts and clays based on the plasticity properties of the soil, as measured by the soils Atterberg limits, ISO14688 grades clay particles as being smaller than 2 μm and silt particles as being larger. These solvents, usually acidic, migrate through the rock after leaching through upper weathered layers. In addition to the process, some clay minerals are formed through hydrothermal activity. There are two types of deposits, primary and secondary. Primary clays form as residual deposits in soil and remain at the site of formation, secondary clays are clays that have been transported from their original location by water erosion and deposited in a new sedimentary deposit. Clay deposits are associated with very low energy depositional environments such as large lakes. Depending on the source, there are three or four main groups of clays, kaolinite, montmorillonite-smectite, illite, and chlorite. Chlorites are not always considered to be a clay, sometimes being classified as a group within the phyllosilicates. There are approximately 30 different types of clays in these categories. Varve is clay with visible annual layers, which are formed by deposition of those layers and are marked by differences in erosion. This type of deposit is common in glacial lakes
28.
Lampblack
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Carbon black is a material produced by the incomplete combustion of heavy petroleum products such as FCC tar, coal tar, ethylene cracking tar, and a small amount from vegetable oil. Carbon black is a form of carbon that has a high surface-area-to-volume ratio. It is dissimilar to soot in its much higher surface-area-to-volume ratio, however, carbon black is widely used as a model compound for diesel soot for diesel oxidation experiments. Carbon black is used as a reinforcing filler in tires. In plastics, paints, and inks carbon black is used as a color pigment, the current International Agency for Research on Cancer evaluation is that, Carbon black is possibly carcinogenic to humans. Short-term exposure to concentrations of carbon black dust may produce discomfort to the upper respiratory tract. Total production was around 8,100,000 metric tons in 2006, the most common use of carbon black is as a pigment and reinforcing phase in automobile tires. Carbon black also helps conduct heat away from the tread and belt area of the tire, reducing thermal damage, the high tinting strength and stability of carbon black has also provided use in coloring of resins and films. About 20% of world production goes into belts, hoses, the balance is mainly used as a pigment in inks, coatings and plastics. For example, it is added to polypropylene because it absorbs ultraviolet radiation, Carbon black from vegetable origin is used as a food coloring, in Europe known as additive E153. It is approved for use as additive 153 in Australia and New Zealand but has been banned in the US, Carbon black has been used in various applications for electronics. As a good conductor of electricity, carbon black is used as a mixed in plastics, elastomer, films, adhesives. Application of carbon black as an agent has provided uses as an additive for fuel caps. Additionally, the color pigment carbon black has been used in food. It is used in multi-layer UHT milk bottles in the US, parts of Europe and Asia, and South Africa, the Canadian Government’s assessment in 2011 concluded that carbon black should continue to be used in products – including food packaging for consumers – in Canada. The highest volume use of black is as a reinforcing filler in rubber products. It is used often in the Aerospace industry in elastomers for aircraft vibration control components such as engine mounts, practically all rubber products where tensile and abrasion wear properties are crucial use carbon black, so they are black in color. Traditionally silica fillers had worse abrasion wear properties, but the technology has improved to a point where they can match carbon black abrasion performance
29.
Jean-Pierre Norblin de La Gourdaine
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Jean-Pierre Norblin de La Gourdaine was a French-born painter, draughtsman, engraver, drawing artist and caricaturist. From 1774 to 1804 he resided in the Crown of the Kingdom of Poland and he is considered one of the most important painters of the Enlightenment in Poland. He achieved great success in Poland, given many commissions from some of the most notable families of the country, he stayed there for many years, not returning to Paris until the early 19th century. He created a gallery of portraits of representatives of all classes in the last years of the Polish–Lithuanian Commonwealth. Norblin started his career in France, in the early sixties, later he became influenced by Rembrandt and Watteau. Around 1771–72 he worked in Paris, London, Dresden and Spa, in 1772 he met Polish Prince Adam Kazimierz Czartoryski, with whom he traveled for two years and by whom he was invited to Poland. From 1774 he worked for the family of Czartoryski and became their court artist. Among his early works the most prominent are his illustrations to Myszeida and he worked in Puławy and at Powązki estates as painter and decorator of local Czartoryskis estates. Later he also worked for the Radziwiłł family in Arkadia and for King Stanisław August Poniatowski. After his return to France in 1804 he still continued to paint based on some of his Poland-era drafts and he died in Paris in 1830. Norblins students in Poland included Aleksander Orłowski, Michał Płoński and Jan Rustem, jean-Pierre Norblin de La Gourdaine was the great-grandfather of an equally accomplished artist, Stefan Norblin. The paintings of Stefan Norblin, who worked in Poland, India and the United States, were rediscovered in the 1990s in India, where they decorate maharajas palaces, e. g. in Rajasthan
30.
National Museum, Warsaw
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The National Museum in Warsaw, popularly abbreviated as MNW, is a national museum in Warsaw, one of the largest museums in Poland and the largest in the capital. The museum is home to numismatic collections, a gallery of applied arts. The National Museum in Warsaw was established on 20 May 1862, as the Museum of Fine Arts, Warsaw, the collection, on Jerusalem Avenue, is housed in a building designed by Tadeusz Tolwiński, developed between 1927 and 1938. In 1932 an exhibition of decorative art opened in the two earlier erected wings of the building, the new building was inaugurated on 18 June 1938. The purpose-built modernistic edifice, was situated on the edge of Na Książęcem Park established between 1776–79 for Prince Kazimierz Poniatowski, from 1935 the museum director was Stanisław Lorentz, who directed an effort to save the most valuable works of art during World War II. The Gestapo headquarters presented Rembrandts portrait of Maerten Soolmans as a gift to Hans Frank in occupied Kraków, after the war the Polish Government, under the supervision of Professor Lorentz, retrieved many of the works seized by the Germans. More than 5,000 artifacts are still missing, in 2008 the Polish Archaeological Mission Tyritake of National Museum in Warsaw commenced works at Tyritake, Crimea. It is headed by Alfred Twardecki curator of the Ancient Art Gallery, in 2010 the National Museum, as one of the first state institutions in the world, held an exhibition entirely consecrated to homoerotic art - Ars Homo Erotica. Since the 2011–12 renovation, the museum is considered as one of the most modern in Europe with a computer-led LED lighting allowing to enhance unique qualities of every painting. In 2012 the permanent galleries underwent revolutionary changes, the curators of the museum re-arranged it and supplemented it with new works from the museums warehouses. Paintings were not hung chronologically, but thematically, genre painting, still lifes, landscapes, cityscapes, biblical, mythological, works by Italian, Flemish, Dutch, German and Polish artists were hung together, making it easy to observe and compare similarities and differences. The Gallery of Medieval Art mainly presents objects from the late Middle Ages, originating from different regions of todays Poland and these works were originally designed almost exclusively for churches. The exhibition was designed to allow the audience to understand the role of art in the life of the Middle Ages. The new techniques implemented in the gallery allow the presentation of large polyptychs, such as the famous Grudziądz Polyptych. The new arrangement of the exhibition was designed by WWAA, the Gallery of Old Masters on the second floor was conceived from the former Gallery of Decorative Art, Gallery of Old European Painting and the Gallery of Old Polish and European Portrait in 2016. It combines species of pictorial art - painting, sculpture, drawings and these social spaces have provided the key to the division of the gallery,1. Church, chapel and domestic altar,3, in the redesigned gallery, the works are presented not according to national schools, but as a confrontation of artistic circles of the South and North. The new system reflects the hierarchy of the created by Renaissance art theory
31.
Paper
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Paper is a thin material produced by pressing together moist fibres of cellulose pulp derived from wood, rags or grasses, and drying them into flexible sheets. It is a material with many uses, including writing, printing, packaging, cleaning. The modern pulp and paper industry is global, with China leading its production, the oldest known archaeological fragments of the immediate precursor to modern paper, date to the 2nd century BC in China. The pulp papermaking process is ascribed to Cai Lun, a 2nd-century AD Han court eunuch, with paper as an effective substitute for silk in many applications, China could export silk in greater quantity, contributing to a Golden Age. Because of papers introduction to the West through the city of Baghdad, in the 19th century, industrial manufacture greatly lowered its cost, enabling mass exchange of information and contributing to significant cultural shifts. In 1844, the Canadian inventor Charles Fenerty and the German F. G. Keller independently developed processes for pulping wood fibres, before the industrialisation of the paper production the most common fibre source was recycled fibres from used textiles, called rags. The rags were from hemp, linen and cotton, a process for removing printing inks from recycled paper was invented by German jurist Justus Claproth in 1774. Today this method is called deinking and it was not until the introduction of wood pulp in 1843 that paper production was not dependent on recycled materials from ragpickers. The word paper is etymologically derived from Latin papyrus, which comes from the Greek πάπυρος, although the word paper is etymologically derived from papyrus, the two are produced very differently and the development of the first is distinct from the development of the second. Papyrus is a lamination of natural plant fibres, while paper is manufactured from fibres whose properties have changed by maceration. To make pulp from wood, a chemical pulping process separates lignin from cellulose fibres and this is accomplished by dissolving lignin in a cooking liquor, so that it may be washed from the cellulose, this preserves the length of the cellulose fibres. Paper made from chemical pulps are also known as wood-free papers–not to be confused with paper, this is because they do not contain lignin. The pulp can also be bleached to produce paper, but this consumes 5% of the fibres, chemical pulping processes are not used to make paper made from cotton. There are three main chemical pulping processes, the process dates back to the 1840s and it was the dominant method extent before the second world war. Most pulping operations using the process are net contributors to the electricity grid or use the electricity to run an adjacent paper mill. Another advantage is that this process recovers and reuses all inorganic chemical reagents, soda pulping is another specialty process used to pulp straws, bagasse and hardwoods with high silicate content. There are two major mechanical pulps, thermomechanical pulp and groundwood pulp, in the TMP process, wood is chipped and then fed into steam heated refiners, where the chips are squeezed and converted to fibres between two steel discs. In the groundwood process, debarked logs are fed into grinders where they are pressed against rotating stones to be made into fibres
32.
Ink
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Ink is a liquid or paste that contains pigments or dyes and is used to color a surface to produce an image, text, or design. Ink is used for drawing or writing with a pen, brush, thicker inks, in paste form, are used extensively in letterpress and lithographic printing. Ink can be a medium, composed of solvents, pigments, dyes, resins, lubricants, solubilizers, surfactants, particulate matter, fluorescents. The components of inks serve many purposes, the carrier, colorants. Pigments are solid, opaque particles suspended in ink to provide color, pigment molecules typically link together in crystalline structures that are 0. 1–2 µm in size and comprise 5–30 percent of the ink volume. Qualities such as hue, saturation, and lightness vary depending on the source, dye-based inks are generally much stronger than pigment-based inks and can produce much more color of a given density per unit of mass. However, because dyes are dissolved in the phase, they have a tendency to soak into paper, making the ink less efficient. To circumvent this problem, dye-based inks are made with solvents that dry rapidly or are used with quick-drying methods of printing, other methods include harder paper sizing and more specialized paper coatings. The latter is particularly suited to inks used in non-industrial settings, another technique involves coating the paper with a charged coating. If the dye has the charge, it is attracted to and retained by this coating. Cellulose, the material most paper is made of, is naturally charged. Such a compound is used in ink-jet printing inks. A more recent development in dye-based inks are dyes that react with cellulose to permanently color the paper, such inks are not affected by water, alcohol, and other solvents. As such, their use is recommended to prevent frauds that involve removing signatures and this kind of ink is most commonly found in gel inks and in certain fountain pen inks. Many ancient cultures around the world have discovered and formulated inks for the purposes of writing and drawing. The knowledge of the inks, their recipes and the techniques for their production comes from archaeological analysis or from written text itself. Evidence for the earliest Chinese inks, similar to modern inksticks, is around 256 BC in the end of the Warring States period and produced from soot, the best inks for drawing or painting on paper or silk are produced from the resin of the pine tree. They must be between 50 and 100 years old, the Chinese inkstick is produced with a fish glue, whereas Japanese glue is from cow or stag
33.
Plate (dishware)
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A plate is a broad, concave, but mainly flat vessel on which food can be served. A plate can also be used for ceremonial or decorative purposes, most plates are circular, but they may be any shape, or made of any water-resistant material. Generally plates are raised round the edges, either by a curving up, vessels with no lip, especially if they have a more rounded profile, are likely to be considered as bowls or dishes, as are very large vessels with a plate shape. Plates in wood, pottery and metal go back into antiquity in many cultures, a plate is typically composed of, The well, the bottom of the plate, where food is placed. The lip, the raised outer part of the plate. Its width in proportion to the well can vary greatly and it usually has a slight upwards slope, or is parallel with the base, as is typical in larger dishes and traditional Chinese shapes. Not all plates have a distinct lip, the rim, the outer edge of the piece, often decorated, for example with gilding. The usual wide and flat European raised lip is derived from old European metalwork plate shapes, Chinese ceramic plates usually just curve up at the edges, a completely flat serving plate, only practical for dry foods, may be called a trencher, especially if in wood. Despite a range of plastics and other materials, ceramics and other traditional materials remain the most common. Porcelain and bone china were once luxurious materials but today can be afforded by most of the worlds population, cheap metal plates, which are the most durable, remain common in the developing world. Disposable plates, which are made from plastic or paper pulp or a composite, were invented in 1904. Also melamine resin or tempered glass such as Corelle can be used, some may take a pottery class and create their own plate with different designs, colors, and textures. Commemorative plates have designs reflecting a particular theme, charger, a decorative plate placed under a separate plate used to hold food, larger Plates can be any shape, but almost all have a rim to prevent food from falling off the edge. They are often white or off-white, but can be any color, including patterns, many are sold in sets of identical plates, so everyone at a table can have matching tableware. It was a hobby, and the variety of shapes. The first limited edition collectors plate Behind the Frozen Window is credited to the Danish company Bing, christmas plates became very popular with many European companies producing them most notably Royal Copenhagen in 1910, and the famous Rosenthal series which began in 1910. The Bradford Book of Collectors Plates 1987, Brian J. Taylor, Chicago, IL
34.
Furniture
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Furniture refers to movable objects intended to support various human activities such as seating, eating, and sleeping. Furniture is also used to hold objects at a convenient height for work, Furniture can be a product of design and is considered a form of decorative art. In addition to furnitures functional role, it can serve a symbolic or religious purpose and it can be made from many materials, including metal, plastic, and wood. Furniture can be using a variety of woodworking joints which often reflect the local culture. People have been using natural objects, such as stumps, rocks and moss. Archaeological research shows that from around 30,000 years ago, people began constructing and carving their own furniture, using wood, stone, early furniture from this period is known from artwork such as a Venus figurine found in Russia, depicting the goddess on a throne. The first surviving extant furniture is in the homes of Skara Brae in Scotland, complex construction techniques such as joinery began in the early dynastic period of ancient Egypt. This era saw constructed wooden pieces, including stools and tables, sometimes decorated with valuable metals or ivory. The evolution of furniture design continued in ancient Greece and ancient Rome, with thrones being commonplace as well as the klinai, multipurpose couches used for relaxing, eating, the furniture of the Middle Ages was usually heavy, oak, and ornamented. Furniture design expanded during the Italian Renaissance of the fourteenth and fifteenth century, the seventeenth century, in both Southern and Northern Europe, was characterized by opulent, often gilded Baroque designs. The nineteenth century is defined by revival styles. The first three-quarters of the century are often seen as the march towards Modernism. One unique outgrowth of post-modern furniture design is a return to natural shapes and textures, the English word furniture is derived from the French word fourniture, the noun form of fournir, which means to supply or provide. Thus fourniture in French means supplies or provisions, the practice of using natural objects as rudimentary pieces of furniture likely dates to the beginning of human civilisation. Early humans are likely to have used tree stumps as seats, rocks as rudimentary tables, during the late palaeolithic or early neolithic period, from around 30,000 years ago, people began constructing and carving their own furniture, using wood, stone, and animal bones. The earliest evidence for the existence of constructed furniture is a Venus figurine found at the Gagarino site in Russia, a similar statue of a Mother Goddess was found in Catal Huyuk in Turkey, dating to between 6000 and 5500 BC. The inclusion of such a seat in the figurines implies that these were already common artefacts of that age, a range of unique stone furniture has been excavated in Skara Brae, a Neolithic village in Orkney, Scotland. Each house shows a degree of sophistication and was equipped with an extensive assortment of stone furniture, ranging from cupboards, dressers and beds to shelves, stone seats
35.
Italy
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Italy, officially the Italian Republic, is a unitary parliamentary republic in Europe. Located in the heart of the Mediterranean Sea, Italy shares open land borders with France, Switzerland, Austria, Slovenia, San Marino, Italy covers an area of 301,338 km2 and has a largely temperate seasonal climate and Mediterranean climate. Due to its shape, it is referred to in Italy as lo Stivale. With 61 million inhabitants, it is the fourth most populous EU member state, the Italic tribe known as the Latins formed the Roman Kingdom, which eventually became a republic that conquered and assimilated other nearby civilisations. The legacy of the Roman Empire is widespread and can be observed in the distribution of civilian law, republican governments, Christianity. The Renaissance began in Italy and spread to the rest of Europe, bringing a renewed interest in humanism, science, exploration, Italian culture flourished at this time, producing famous scholars, artists and polymaths such as Leonardo da Vinci, Galileo, Michelangelo and Machiavelli. The weakened sovereigns soon fell victim to conquest by European powers such as France, Spain and Austria. Despite being one of the victors in World War I, Italy entered a period of economic crisis and social turmoil. The subsequent participation in World War II on the Axis side ended in defeat, economic destruction. Today, Italy has the third largest economy in the Eurozone and it has a very high level of human development and is ranked sixth in the world for life expectancy. The country plays a prominent role in regional and global economic, military, cultural and diplomatic affairs, as a reflection of its cultural wealth, Italy is home to 51 World Heritage Sites, the most in the world, and is the fifth most visited country. The assumptions on the etymology of the name Italia are very numerous, according to one of the more common explanations, the term Italia, from Latin, Italia, was borrowed through Greek from the Oscan Víteliú, meaning land of young cattle. The bull was a symbol of the southern Italic tribes and was often depicted goring the Roman wolf as a defiant symbol of free Italy during the Social War. Greek historian Dionysius of Halicarnassus states this account together with the legend that Italy was named after Italus, mentioned also by Aristotle and Thucydides. The name Italia originally applied only to a part of what is now Southern Italy – according to Antiochus of Syracuse, but by his time Oenotria and Italy had become synonymous, and the name also applied to most of Lucania as well. The Greeks gradually came to apply the name Italia to a larger region, excavations throughout Italy revealed a Neanderthal presence dating back to the Palaeolithic period, some 200,000 years ago, modern Humans arrived about 40,000 years ago. Other ancient Italian peoples of undetermined language families but of possible origins include the Rhaetian people and Cammuni. Also the Phoenicians established colonies on the coasts of Sardinia and Sicily, the Roman legacy has deeply influenced the Western civilisation, shaping most of the modern world
36.
Germany
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Germany, officially the Federal Republic of Germany, is a federal parliamentary republic in central-western Europe. It includes 16 constituent states, covers an area of 357,021 square kilometres, with about 82 million inhabitants, Germany is the most populous member state of the European Union. After the United States, it is the second most popular destination in the world. Germanys capital and largest metropolis is Berlin, while its largest conurbation is the Ruhr, other major cities include Hamburg, Munich, Cologne, Frankfurt, Stuttgart, Düsseldorf and Leipzig. Various Germanic tribes have inhabited the northern parts of modern Germany since classical antiquity, a region named Germania was documented before 100 AD. During the Migration Period the Germanic tribes expanded southward, beginning in the 10th century, German territories formed a central part of the Holy Roman Empire. During the 16th century, northern German regions became the centre of the Protestant Reformation, in 1871, Germany became a nation state when most of the German states unified into the Prussian-dominated German Empire. After World War I and the German Revolution of 1918–1919, the Empire was replaced by the parliamentary Weimar Republic, the establishment of the national socialist dictatorship in 1933 led to World War II and the Holocaust. After a period of Allied occupation, two German states were founded, the Federal Republic of Germany and the German Democratic Republic, in 1990, the country was reunified. In the 21st century, Germany is a power and has the worlds fourth-largest economy by nominal GDP. As a global leader in industrial and technological sectors, it is both the worlds third-largest exporter and importer of goods. Germany is a country with a very high standard of living sustained by a skilled. It upholds a social security and universal health system, environmental protection. Germany was a member of the European Economic Community in 1957. It is part of the Schengen Area, and became a co-founder of the Eurozone in 1999, Germany is a member of the United Nations, NATO, the G8, the G20, and the OECD. The national military expenditure is the 9th highest in the world, the English word Germany derives from the Latin Germania, which came into use after Julius Caesar adopted it for the peoples east of the Rhine. This in turn descends from Proto-Germanic *þiudiskaz popular, derived from *þeudō, descended from Proto-Indo-European *tewtéh₂- people, the discovery of the Mauer 1 mandible shows that ancient humans were present in Germany at least 600,000 years ago. The oldest complete hunting weapons found anywhere in the world were discovered in a mine in Schöningen where three 380, 000-year-old wooden javelins were unearthed
37.
Drawing
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Drawing is a form of visual art in which a person uses various drawing instruments to mark paper or another two-dimensional medium. A drawing instrument releases small amount of material onto a surface, the most common support for drawing is paper, although other materials, such as cardboard, plastic, leather, canvas, and board, may be used. Temporary drawings may be made on a blackboard or whiteboard or indeed almost anything, the medium has been a popular and fundamental means of public expression throughout human history. It is one of the simplest and most efficient means of communicating visual ideas, the wide availability of drawing instruments makes drawing one of the most common artistic activities. In addition to its artistic forms, drawing is frequently used in commercial illustration, animation, architecture, engineering. A quick, freehand drawing, usually not intended as a work, is sometimes called a sketch. An artist who practices or works in technical drawing may be called a drafter, Drawing is one of the major forms of expression within the visual arts. It is generally concerned with the marking of lines and areas of tone onto paper/other material, traditional drawings were monochrome, or at least had little colour, while modern colored-pencil drawings may approach or cross a boundary between drawing and painting. In Western terminology, drawing is distinct from painting, even though similar media often are employed in both tasks, dry media, normally associated with drawing, such as chalk, may be used in pastel paintings. Drawing may be done with a medium, applied with brushes or pens. Drawing is often exploratory, with emphasis on observation, problem-solving. Drawing is also used in preparation for a painting, further obfuscating their distinction. Drawings created for these purposes are called studies, there are several categories of drawing, including figure drawing, cartooning, doodling, free hand and shading. There are also many drawing methods, such as drawing, stippling, shading, the surrealist method of entopic graphomania. A quick, unrefined drawing may be called a sketch, in fields outside art, technical drawings or plans of buildings, machinery, circuitry and other things are often called drawings even when they have been transferred to another medium by printing. Drawing as a Form of Communication Drawing is one of the oldest forms of human expression and these drawings, known as pictograms, depicted objects and abstract concepts. The sketches and paintings produced in prehistoric times were eventually stylised and simplified, Drawing in the Arts Drawing is used to express ones creativity, and therefore has been prominent in the world of art. Throughout much of history, drawing was regarded as the foundation for artistic practise, initially, artists used and reused wooden tablets for the production of their drawings
38.
Drapery
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Drapery is a general word referring to cloths or textiles. It may refer to cloth used for decorative purposes – such as around windows – or to the trade of retailing cloth, originally mostly for clothing, in art history, drapery refers to any cloth or textile depicted, which is usually clothing. After the Renaissance, large cloths with no obvious purpose are often used decoratively, especially in portraits in the grand manner. Drapery, by suggesting lines of force, indicates for each action a past, undraped male figures, Clark observed, were kept in motion by their flying cloaks
39.
Shading
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Shading refers to depicting depth perception in 3D models or illustrations by varying levels of darkness. There are various techniques of shading including cross hatching where perpendicular lines of varying closeness are drawn in a pattern to shade an area. The closer the lines are together, the darker the area appears, likewise, the farther apart the lines are, the lighter the area appears. Light patterns, such as objects having light and shaded areas, powder shading is a sketching shading method. In this style, the powder and paper stumps are used to draw a picture. The stumping powder is smooth and doesnt have any shiny particles, the paper to be used should have small grains on it so that the powder remains on the paper. Shading is performed during the process by a program called a shader. Shading alters the colors of faces in a 3D model based on the angle of the surface to a source or light sources. The first image below has the faces of the box rendered, edge lines have been rendered here as well which makes the image easier to see. The second image is the same model rendered without edge lines and it is difficult to tell where one face of the box ends and the next begins. The third image has shading enabled, which makes the image more realistic, Shading is also dependent on the lighting used. Usually, upon rendering a scene a number of different lighting techniques will be used to make the look more realistic. Different types of sources are used to give different effects. An ambient light source represents an omni-directional, fixed-intensity and fixed-color light source that affects all objects in the scene equally, upon rendering, all objects in the scene are brightened with the specified intensity and color. This type of source is mainly used to provide the scene with a basic view of the different objects in it. This is the simplest type of lighting to implement and models how light can be scattered or reflected many times producing a uniform effect. Ambient lighting can be combined with ambient occlusion to represent how exposed each point of the scene is and this produces diffuse, non-directional lighting throughout the scene, casting no clear shadows, but with enclosed and sheltered areas darkened. The result is usually similar to an overcast day
40.
Hatching
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Hatching is an artistic technique used to create tonal or shading effects by drawing closely spaced parallel lines. When lines are placed at an angle to one another, it is called cross-hatching, Hatching is especially important in essentially linear media, such as drawing, and many forms of printmaking, such as engraving, etching and woodcut. In Western art, hatching originated in the Middle Ages, and developed further into cross-hatching, artists use the technique, varying the length, angle, closeness and other qualities of the lines, most commonly in drawing, linear painting and engraving. The main concept is that the quantity, thickness and spacing of the lines will affect the brightness of the overall image, Hatching lines should always follow the form. By increasing quantity, thickness and closeness, an area will result. An area of shading next to another area which has lines going in another direction is used to create contrast. Line work can be used to represent colours, typically by using the type of hatch to represent particular tones. For example, red might be made up of lightly spaced lines, linear hatching Hatching in parallel lines. Normally the lines follow the direction of the described plane, crosshatching Layers of hatching applied at different angles to create different textures and darker tones. At its simplest, a layer of linear hatching is laid over another layer at a 90° angle, other methods include layering arbitrary intersecting patches. Crosshatching in which layers intersect at slight angles can create a rippled moiré effect, contoured hatching Hatching using curved lines to describe light and form of contours. Dip pen Printmaking Hatching system hatching article in ArtLex Art Dictionary
41.
Chiaroscuro
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Chiaroscuro is an oil painting technique, developed during the Renaissance, that uses strong tonal contrasts between light and dark to model three-dimensional forms, often to dramatic effect. The underlying principle is that solidity of form is best achieved by the light falling against it, artists known for developing the technique include Leonardo da Vinci, Caravaggio, and Rembrandt. It is a mainstay of black and white photography and these in turn drew on traditions in illuminated manuscripts going back to late Roman Imperial manuscripts on purple-dyed vellum. Such works used to be called chiaroscuro drawings, but are often described in modern museum terminology by such formulae as pen on prepared paper. Chiaroscuro woodcuts began as imitations of this technique, when discussing Italian art, the term sometimes is used to mean painted images in monochrome or two colours, more generally known in English by the French equivalent, grisaille. The term broadened in meaning early on to cover all strong contrasts in illumination between light and dark areas in art, which is now the primary meaning. The invention of these effects in the West, skiagraphia or shadow-painting to the Ancient Greeks, traditionally was ascribed to the famous Athenian painter of the fifth century BC, Apollodoros. Chose her place to sit for that purpose in the alley of a goodly garden. In drawings and prints, modelling chiaroscuro often is achieved by the use of hatching, washes, stipple or dotting effects, and surface tone in printmaking are other techniques. Chiaroscuro woodcuts are old master prints in woodcut using two or more blocks printed in different colours, they do not necessarily feature strong contrasts of light and they were first produced to achieve similar effects to chiaroscuro drawings. Other printmakers to use the technique include Hans Wechtlin, Hans Baldung Grien, in Germany the technique achieved its greatest popularity around 1520, but it was used in Italy throughout the sixteenth century. Later artists such as Goltzius sometimes made use of it, in most German two-block prints, the keyblock was printed in black and the tone block or blocks had flat areas of colour. In Italy, chiaroscuro woodcuts were produced without keyblocks to achieve a different effect. Manuscript illumination was, as in areas, especially experimental in attempting ambitious lighting effects since the results were not for public display. The development of compositional chiaroscuro received an impetus in northern Europe from the vision of the Nativity of Jesus of Saint Bridget of Sweden. Hugo van der Goes and his followers painted many scenes lit only by candle or the light from the infant Christ. As with some later painters, in their hands the effect was of stillness, strong chiaroscuro became a popular effect during the sixteenth century in Mannerism and Baroque art. Divine light continued to illuminate, often rather inadequately, the compositions of Tintoretto, Veronese, tenebrism was especially practiced in Spain and the Spanish-ruled Kingdom of Naples, by Jusepe de Ribera and his followers
42.
Andrea Mantegna
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Andrea Mantegna was an Italian painter, a student of Roman archeology, and son-in-law of Jacopo Bellini. Like other artists of the time, Mantegna experimented with perspective and his flinty, metallic landscapes and somewhat stony figures give evidence of a fundamentally sculptural approach to painting. He also led a workshop that was the producer of prints in Venice before 1500. Mantegna was born in Isola di Carturo, Republic of Venice close to Padua, second son of a carpenter, at the age of eleven he became the apprentice of Francesco Squarcione, Paduan painter. Squarcione, whose vocation was tailoring, appears to have had a remarkable enthusiasm for ancient art. All the while, he continued undertaking works on commission for which his pupils no less than himself were made available, as many as 137 painters and pictorial students passed through Squarciones school, which had been established towards 1440 and which became famous all over Italy. Padua was attractive for artists coming not only from Veneto but also from Tuscany, such as Paolo Uccello, Filippo Lippi, Mantegnas early career was shaped indeed by impressions of Florentine works. At the time, Mantegna was said to be a favorite pupil, Squarcione taught him Latin and instructed him to study fragments of Roman sculpture. The master also preferred forced perspective, the results of which may account for some of Mantegnas later innovations. However, at the age of seventeen, Mantegna separated himself from Squarcione and he later claimed that Squarcione had profited from his work without paying the rights. His first work, now lost, was an altarpiece for the church of Santa Sofia in 1448. After a series of coincidences, Mantegna finished most of the work alone, though Ansuino and this series was almost entirely lost in the 1944 allied bombings of Padua. The most dramatic work of the cycle was the work set in the worms-eye view perspective. The sketch of the St. Stephen fresco survived and is the earliest known preliminary sketch which still exists to compare to the corresponding fresco, the drawing shows proof that nude figures were used in the conception of works during the Early Renaissance. In the preliminary sketch, the perspective is less developed and closer to a more average viewpoint however, despite the authentic look of the monument, it is not a copy of any known Roman structure. Luke and other saints for the church of S. Giustina, as the young artist progressed in his work, he came under the influence of Jacopo Bellini, father of the celebrated painters Giovanni Bellini and Gentile Bellini, and of a daughter Nicolosia. In 1453 Jacopo consented to a marriage between Nicolosia and Mantegna, trained as he had been in the study of marbles and the severity of the antique, Mantegna openly avowed that he considered ancient art superior to nature as being more eclectic in form. As a result, the painter exercised precision in outline, privileging the figure, overall, Mantegnas work thus tended towards rigidity, demonstrating an austere wholeness rather than graceful sensitivity of expression
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Marcantonio Raimondi
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Marcantonio Raimondi, often called simply Marcantonio, was an Italian engraver, known for being the first important printmaker whose body of work consists largely of prints copying paintings. He is therefore a key figure in the rise of the reproductive print and he also systematized a technique of engraving that became dominant in Italy and elsewhere. Much of the information we have comes from his life. He is attributed with around 300 engravings, marcantonios date of birth is unknown, but was by 1482 at the latest. He was possibly born in Argine, near Bologna, Italy and he trained in the workshop of the leading goldsmith and painter in Bologna, Francesco Francia. Vasari claimed that Marcantonio quickly demonstrated more aptitude than Francia, and this is doubted, however, by Arthur Mayger Hind, who sees no evidence of a background in niello technique in his early engravings. No paintings produced by Marcantonio are known or documented, although some drawings survive and his first dated engraving, Pyramus and Thisbe, comes from 1505, although a number of undated works come from the years before this. From 1505–1511, Marcantonio engraved about 80 pieces, with a variety of subject matter, from pagan mythology. Like other printmakers such as Giulio Campagnola, he borrowed elements of Dürers landscapes in a cut and paste fashion, Dürer was in Bologna in 1506, as was Michelangelo, and he may have met one or both of them. About this time he began to make copies of Dürers woodcut series and this was extremely common practice, although normally engravers copied other expensive engravings rather than the cheaper woodcuts. Marcantonio appears to have spent some of the last half of the decade in Venice, around 1510, Marcantonio travelled to Rome and entered the circle of artists surrounding Raphael. This influence began showing up in engravings titled The Climbers, after a reproduction of a work by Raphael, entitled Lucretia, Raphael trained and assisted Marcantonio personally. Another famous engraving, the Judgement of Paris, dated 1515 or 1516, after Raphael, the two started a successful printing establishment under a colorgrinder, Il Baveria, that quickly expanded into an engraving school with Marcantonio at the head. Among his most distinguished pupils were Marco Dente, Giovanni Jacopo Caraglio, Marcantonio and his pupils continued to make engravings based upon Raphaels work, even after Raphaels death in 1520. In many instances, Marcantonio would not copy the finished painting and this method produced variations on a theme and were moderately successful. At the intercession of the Cardinal Ippolito de Medici, Baccio Bandinelli and Pietro Aretino, he was released, during the Sack of Rome, in 1527, he was forced to pay a heavy ransom by the Spaniards and fled in poverty. It is unclear where he stayed after his departure from Rome until his death in 1534, BM Marcantonio, British Museum Bohn, Babette. Grove Art Online, Oxford Art Online, Oxford University Press, subscription required Boorsch, Suzanne, in, K. L
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Raphael
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Raffaello Sanzio da Urbino, known as Raphael, was an Italian painter and architect of the High Renaissance. His work is admired for its clarity of form, ease of composition, together with Michelangelo and Leonardo da Vinci, he forms the traditional trinity of great masters of that period. Raphael was enormously productive, running a large workshop and, despite his death at 37. Many of his works are found in the Vatican Palace, where the frescoed Raphael Rooms were the central, the best known work is The School of Athens in the Vatican Stanza della Segnatura. After his early years in Rome much of his work was executed by his workshop from his drawings and he was extremely influential in his lifetime, though outside Rome his work was mostly known from his collaborative printmaking. Raphael was born in the small but artistically significant central Italian city of Urbino in the Marche region and his poem to Federico shows him as keen to show awareness of the most advanced North Italian painters, and Early Netherlandish artists as well. In the very court of Urbino he was probably more integrated into the central circle of the ruling family than most court painters. Under them, the court continued as a centre for literary culture, growing up in the circle of this small court gave Raphael the excellent manners and social skills stressed by Vasari. Castiglione moved to Urbino in 1504, when Raphael was no longer based there but frequently visited, Raphael mixed easily in the highest circles throughout his life, one of the factors that tended to give a misleading impression of effortlessness to his career. He did not receive a humanistic education however, it is unclear how easily he read Latin. His mother Màgia died in 1491 when Raphael was eight, followed on August 1,1494 by his father, Raphael was thus orphaned at eleven, his formal guardian became his only paternal uncle Bartolomeo, a priest, who subsequently engaged in litigation with his stepmother. He probably continued to live with his stepmother when not staying as an apprentice with a master and he had already shown talent, according to Vasari, who says that Raphael had been a great help to his father. A self-portrait drawing from his teenage years shows his precocity and his fathers workshop continued and, probably together with his stepmother, Raphael evidently played a part in managing it from a very early age. In Urbino, he came into contact with the works of Paolo Uccello, previously the court painter, and Luca Signorelli, according to Vasari, his father placed him in the workshop of the Umbrian master Pietro Perugino as an apprentice despite the tears of his mother. The evidence of an apprenticeship comes only from Vasari and another source, an alternative theory is that he received at least some training from Timoteo Viti, who acted as court painter in Urbino from 1495. An excess of resin in the varnish often causes cracking of areas of paint in the works of both masters, the Perugino workshop was active in both Perugia and Florence, perhaps maintaining two permanent branches. Raphael is described as a master, that is to say fully trained and his first documented work was the Baronci altarpiece for the church of Saint Nicholas of Tolentino in Città di Castello, a town halfway between Perugia and Urbino. Evangelista da Pian di Meleto, who had worked for his father, was named in the commission
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Martin Schongauer
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Martin Schongauer, also known as Martin Schön or Hübsch Martin by his contemporaries, was an Alsatian engraver and painter. He was the most important printmaker north of the Alps before Albrecht Dürer, Schongauer was born in about 1440 in Colmar, Alsace, probably the third of the four sons of Caspar Schongauer, a goldsmith from Augsburg who taught his son the art of engraving. Colmar is now in France but was part of the Holy Roman Empire. He may well have trained by Master E. S. The art historian A. Hyatt Mayor saw both their styles in different parts of a single engraving, and all the works with Schongauers M†S monogram show a fully developed style. Schongauer established at Colmar a very important school of engraving, out of which grew the Little Masters of the generation. Only a few of his paintings survive, the most notable of them being the Madonna in the Rose Garden, painted for St Martins Church, Colmar. The Musée d´Unterlinden in Colmar possesses eleven panels by him or his workshop, the miniature painting of the Death of the Virgin in the National Gallery, London is probably the work of a pupil. The main work of Schongauers life was the production of a number of beautiful engravings, which were largely sold, not only in Germany. Vasari says that Michelangelo copied one of his engravings, in the Trial of Saint Anthony and his style shows no trace of Italian influence, but a very clear and organised Gothic. His subjects are mainly religious, but include comic scenes of life such as the Peasant family going to market or the Two apprentices fighting. One hundred and sixteen engravings are generally recognised as by his hand, many of his pupils plates as well as his own are signed, M†S, as are many copies probably by artists with no connection to him. Among the most renowned of Schongauers engravings are the series of the Passion and the Death and Coronation of the Virgin, all are remarkable for their miniature-like treatment, their brilliant touch, and their chromatic force. Some, such as the Death of the Virgin and the Adoration of the Magi are richly-filled compositions of many figures and he also developed a burin technique producing deeper lines on the plate, which meant that more impressions could be taken before the plate became worn. The British Museum and other major print rooms possess fine collections of Schongauers prints, influencia de Martin Schongauer en los primitivos aragoneses, Boletin del Museo e Instituto Camon Aznar’, vol. xvii, pp. 15–39. Attribution This article incorporates text from a now in the public domain, Chisholm, Hugh, ed. Schongauer
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Peter Paul Rubens
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Sir Peter Paul Rubens was a Flemish/Netherlandish draughtsman and painter. He is widely considered as the most notable artist of Flemish Baroque art school, the catalogue of his works by Michael Jaffé lists 1,403 pieces, excluding numerous copies made in his workshop. His commissioned works were mostly history paintings, which included religious and mythological subjects and he painted portraits, especially of friends, and self-portraits, and in later life painted several landscapes. Rubens designed tapestries and prints, as well as his own house and he also oversaw the ephemeral decorations of the royal entry into Antwerp by the Cardinal-Infante Ferdinand in 1635. His drawings are mostly extremely forceful but not overly detailed and he also made great use of oil sketches as preparatory studies. For altarpieces he painted on slate to reduce reflection problems. Rubens was born in the city of Siegen to Jan Rubens and he was named in honour of Saint-Peter and Paul, because he was born on their solemnety. His father, a Calvinist, and mother fled Antwerp for Cologne in 1568, after increased religious turmoil and persecution of Protestants during the rule of the Spanish Netherlands by the Duke of Alba. Jan Rubens became the adviser of Anna of Saxony, the second wife of William I of Orange. Following Jan Rubens imprisonment for the affair, Peter Paul Rubens was born in 1577, the family returned to Cologne the next year. In 1589, two years after his fathers death, Rubens moved with his mother Maria Pypelincks to Antwerp, religion figured prominently in much of his work and Rubens later became one of the leading voices of the Catholic Counter-Reformation style of painting. In Antwerp, Rubens received a Renaissance humanist education, studying Latin, by fourteen he began his artistic apprenticeship with Tobias Verhaeght. Subsequently, he studied under two of the leading painters of the time, the late Mannerist artists Adam van Noort. Much of his earliest training involved copying earlier works, such as woodcuts by Hans Holbein the Younger. Rubens completed his education in 1598, at time he entered the Guild of St. Luke as an independent master. In 1600 Rubens travelled to Italy and he stopped first in Venice, where he saw paintings by Titian, Veronese, and Tintoretto, before settling in Mantua at the court of Duke Vincenzo I Gonzaga. The colouring and compositions of Veronese and Tintoretto had an effect on Rubenss painting. With financial support from the Duke, Rubens travelled to Rome by way of Florence in 1601, there, he studied classical Greek and Roman art and copied works of the Italian masters
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Physical model
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Physical model is a smaller or larger physical copy of an object. The object being modelled may be small or large, the geometry of the model and the object it represents are often similar in the sense that one is a rescaling of the other, in such cases the scale is an important characteristic. However, in cases the similarity is only approximate or even intentionally distorted. Sometimes the distortion is systematic with e. g. a fixed scale horizontally, physical models allow visualization, from examining the model, of information about the thing the model represents. A model can be an object such as an architectural model of a building. Uses of a model include visualization of internal relationships within the structure or external relationships of the structure to the environment. Other uses of models in this sense are as toys, instrumented physical models are the most effective way of investigating fluid flows such as around hydraulic structures. These models are scaled in terms of geometry and important forces, for example using Froude number or Reynolds number scaling. A physical model of something large is usually smaller, and of something very small is larger, a physical model of something that can move, like a vehicle or machine, may be completely static, or have parts that can be moved manually, or be powered. A physical model may show inner parts that are not visible. The purpose of a model on a smaller scale may be to have a better overview, for testing purposes. A physical model of an animal shows the physical composition without it walking or flying away, and without danger. A soft model of an animal is popular among children and some adults as cuddly toy. some models can be used in different ways as of like prototypes for cars. A model of a person may e. g. be a doll, a statue, and in fiction a robotic humanoid, e. g. the mechas in the movie A. I. A model is a 3D alternative for a 2D representation such as a drawing or photograph, or in the case of a globe, scale model Mathematical model Model organism Model nation Metamodeling Model airplane Model car Model railway Model rocket Model house
Chisholm, Hugh, ed. (1911). "Line engraving". Encyclopædia Britannica. 16 (11th ed.). Cambridge University Press. pp. 721–4.
Chisholm, Hugh, ed. (1911).