1.
Bastion
–
A bastion is an angular structure projecting outward from the curtain wall of a fortification, most commonly at the corners. The fully developed bastion consists of two faces and two flanks with fire from the flanks being able to protect the wall and also the adjacent bastions. It is one element in the style of fortification dominant from the mid 16th to mid 19th centuries, Bastion fortifications offered a greater degree of passive resistance and more scope for ranged defense in the age of gunpowder artillery compared with the medieval fortifications they replaced. By the middle of the 15th century, artillery pieces had become powerful enough to make the traditional medieval round tower, during the Eighty Years War Dutch military engineers developed the concepts further lengthening the faces and shortening the curtain walls of the bastions. To augment this change they placed v shaped outworks in front of the bastions, Bastions differ from medieval towers in a number of respects. Bastions are lower than towers and are normally of similar height to the adjacent curtain wall, the height of towers, although making them difficult to scale, also made them easy for artillery to destroy. A bastion would normally have a ditch in front, the side of which would be built up above the natural level then slope away gradually. This glacis shielded most of the bastion from the cannon while the distance from the base of the ditch to the top of the bastion meant it was still difficult to scale. In contrast to late medieval towers, bastions were flat sided rather than curved. This eliminated dead ground making it possible for the defenders to fire upon any point directly in front of the bastion, Bastions also cover a larger area than most towers. This allows more cannons to be mounted and provided space for the crews to operate them. Surviving examples of bastions are usually faced with masonry, unlike the wall of a tower this was just a retaining wall, cannonball were expected to pass through this and be absorbed by a greater thickness of hard-packed earth or rubble behind. The top of the bastion was exposed to fire. If a bastion was successfully stormed, it could provide the attackers with a stronghold from which to further attacks. Some bastion designs attempted to minimise this problem and this could be achieved by the use of retrenchments in which a trench was dug across the rear of the bastion, isolating it from the main rampart. Various kinds of bastions have been used throughout history, solid bastions are those that are filled up entirely, and have the ground even with the height of the rampart, without any empty space towards the centre. Void or hollow bastions are those that have a rampart, or parapet, only around their flanks and faces, so that a void space is left towards the centre. The ground is so low, that if the rampart is taken, no retrenchment can be made in the centre, but what will lie under the fire of the besieged
Bastion
–
Drawing of a bastion
Bastion
–
A bastion in the
Komárno Fortress (Slovakia).
Bastion
–
One of the bastions of the castle of
Copertino,
Italy
Bastion
–
Aerial view of bastions at the Castle Siklós,
Hungary
2.
Cannon
–
A cannon is any piece of artillery that uses gunpowder or other usually explosive-based propellants to launch a projectile, which may or may not be explosive. The word cannon is derived from languages, in which the original definition can usually be translated as tube, cane. The Greeks invented the first type—a steam cannon—designed by Archimedes during the Siege of Syracuse, ctesibius built a steam cannon in Alexandria and in the fifteenth century Leonardo da Vinci designed another, the Architonnerre, based on Archimedes work. The earliest form of artillery was developed in Song China, over time replacing siege engines. In the Middle East, the first use of the cannon is argued to be during the 1260 Battle of Ain Jalut between the Mamluk Sultanate and Mongol Empire. The first cannon in Europe were in use in the Iberian Peninsula by the mid-13th century and it was during this period, the Middle Ages, that cannon became standardised, and more effective in both the anti-infantry and siege roles. After the Middle Ages most large cannon were abandoned in favour of greater numbers of lighter, Cannon also transformed naval warfare in the early modern period, as European navies took advantage of their firepower. In World War I, the majority of fatalities were caused by artillery. Most modern cannon are similar to those used in the Second World War, Cannon was widely known as the earliest form of a gun and artillery, before early firearms were invented. The word has been used to refer to a gun since 1326 in Italy, both Cannons and Cannon are correct and in common usage, with one or the other having preference in different parts of the English-speaking world. Cannons is more common in North America and Australia, while cannon as plural is more common in the United Kingdom, Cannon in general have the form of a truncated cone with an internal cylindrical bore for holding an explosive charge and a projectile. The thickest, strongest, and closed part of the cone is located near the explosive charge, as any explosive charge will dissipate in all directions equally, the thickest portion of the cannon is useful for containing and directing this force. Field artillery cannon in Europe and the Americas were initially made most often of bronze, though later forms were constructed of cast iron and eventually steel. However, cast iron cannon have a tendency to burst without having any previous weakness or wear. The following terms refer to the components or aspects of a classical western cannon as illustrated here. In what follows, the words near, close, and behind will refer to those parts towards the thick, closed end of the piece, and far, front, in front of, and before to the thinner, open end. Bore, The hollow cylinder bored down the centre of the cannon, including the base of the bore or bottom of the bore, the diameter of the bore represents the cannons calibre. Chamber, The cylindrical, conical, or spherical recess at the nearest end of the bottom of the bore into which the gunpowder is packed
Cannon
Cannon
Cannon
–
An illustration of an "eruptor," a proto-cannon, from the 14th-century Ming Dynasty book
Huolongjing. The cannon was capable of firing proto-shells, cast-iron bombs filled with gunpowder.
Cannon
–
Earliest known representation of a firearm (a
fire lance) and a
grenade (upper right),
Dunhuang, 10th century
3.
Sveti Rok
–
Sveti Rok is a small village in the Lovinac municipality, in Lika–Senj County, Croatia. Sveti Rok has a population of 292, the majority of the population are Croats. Until 1918, Sveti Rok was part of the Austrian monarchy, the village named after Saint Roch
Sveti Rok
–
A farm near Sveti Rok and Velebit Mountain.
4.
Croatia
–
Croatia, officially the Republic of Croatia, is a sovereign state between Central Europe, Southeast Europe, and the Mediterranean. Its capital city is Zagreb, which one of the countrys primary subdivisions. Croatia covers 56,594 square kilometres and has diverse, mostly continental, Croatias Adriatic Sea coast contains more than a thousand islands. The countrys population is 4.28 million, most of whom are Croats, the Croats arrived in the area of present-day Croatia during the early part of the 7th century AD. They organised the state into two duchies by the 9th century, tomislav became the first king by 925, elevating Croatia to the status of a kingdom. The Kingdom of Croatia retained its sovereignty for nearly two centuries, reaching its peak during the rule of Kings Petar Krešimir IV and Dmitar Zvonimir, Croatia entered a personal union with Hungary in 1102. In 1527, faced with Ottoman conquest, the Croatian Parliament elected Ferdinand I of the House of Habsburg to the Croatian throne. In 1918, after World War I, Croatia was included in the unrecognized State of Slovenes, Croats and Serbs which seceded from Austria-Hungary, a fascist Croatian puppet state backed by Fascist Italy and Nazi Germany existed during World War II. After the war, Croatia became a member and a federal constituent of the Socialist Federal Republic of Yugoslavia. On 25 June 1991 Croatia declared independence, which came wholly into effect on 8 October of the same year, the Croatian War of Independence was fought successfully during the four years following the declaration. A unitary state, Croatia is a republic governed under a parliamentary system, the International Monetary Fund classified Croatia as an emerging and developing economy, and the World Bank identified it as a high-income economy. Croatia is a member of the European Union, United Nations, the Council of Europe, NATO, the World Trade Organization, the service sector dominates Croatias economy, followed by the industrial sector and agriculture. Tourism is a significant source of revenue during the summer, with Croatia ranked the 18th most popular tourist destination in the world, the state controls a part of the economy, with substantial government expenditure. The European Union is Croatias most important trading partner, since 2000, the Croatian government constantly invests in infrastructure, especially transport routes and facilities along the Pan-European corridors. Internal sources produce a significant portion of energy in Croatia, the rest is imported, the origin of the name is uncertain, but is thought to be a Gothic or Indo-Aryan term assigned to a Slavic tribe. The oldest preserved record of the Croatian ethnonym *xъrvatъ is of variable stem, the first attestation of the Latin term is attributed to a charter of Duke Trpimir from the year 852. The original is lost, and just a 1568 copy is preserved—leading to doubts over the authenticity of the claim, the oldest preserved stone inscription is the 9th-century Branimir Inscription, where Duke Branimir is styled as Dux Cruatorvm. The inscription is not believed to be dated accurately, but is likely to be from during the period of 879–892, the area known as Croatia today was inhabited throughout the prehistoric period
Croatia
–
Branimir Inscription
Croatia
–
Flag
Croatia
–
Tanais Tablet B, name Khoroáthos highlighted
Croatia
–
The
walls of Dubrovnik helped to defend the city since
Middle Ages until the
1991–1992 siege.
5.
Italian language
–
By most measures, Italian, together with Sardinian, is the closest to Latin of the Romance languages. Italian is a language in Italy, Switzerland, San Marino, Vatican City. Italian is spoken by minorities in places such as France, Montenegro, Bosnia & Herzegovina, Crimea and Tunisia and by large expatriate communities in the Americas. Many speakers are native bilinguals of both standardized Italian and other regional languages, Italian is the fourth most studied language in the world. Italian is a major European language, being one of the languages of the Organisation for Security and Cooperation in Europe. It is the third most widely spoken first language in the European Union with 65 million native speakers, including Italian speakers in non-EU European countries and on other continents, the total number of speakers is around 85 million. Italian is the working language of the Holy See, serving as the lingua franca in the Roman Catholic hierarchy as well as the official language of the Sovereign Military Order of Malta. Italian is known as the language of music because of its use in musical terminology and its influence is also widespread in the arts and in the luxury goods market. Italian has been reported as the fourth or fifth most frequently taught foreign language in the world, Italian was adopted by the state after the Unification of Italy, having previously been a literary language based on Tuscan as spoken mostly by the upper class of Florentine society. Its development was influenced by other Italian languages and to some minor extent. Its vowels are the second-closest to Latin after Sardinian, unlike most other Romance languages, Italian retains Latins contrast between short and long consonants. As in most Romance languages, stress is distinctive, however, Italian as a language used in Italy and some surrounding regions has a longer history. What would come to be thought of as Italian was first formalized in the early 14th century through the works of Tuscan writer Dante Alighieri, written in his native Florentine. Dante is still credited with standardizing the Italian language, and thus the dialect of Florence became the basis for what would become the language of Italy. Italian was also one of the recognised languages in the Austro-Hungarian Empire. Italy has always had a dialect for each city, because the cities. Those dialects now have considerable variety, as Tuscan-derived Italian came to be used throughout Italy, features of local speech were naturally adopted, producing various versions of Regional Italian. Even in the case of Northern Italian languages, however, scholars are not to overstate the effects of outsiders on the natural indigenous developments of the languages
Italian language
–
Dante Alighieri (above) and
Petrarch (below) were influential in establishing their
Tuscan dialect as the most prominent literary language in all of
Italy in the
Late Middle Ages
Italian language
–
The geographic distribution of the Italian language in the world: large Italian-speaking communities are shown in green; light blue indicates areas where the Italian language was used officially during the Italian colonial period.
Italian language
Italian language
–
Pietro Bembo was an influential figure in the development of the Italian language from the Tuscan dialect, as a literary medium, codifying the language for standard modern usage
6.
Cage (enclosure)
–
A cage is an enclosure often made of mesh, bars or wires, used to confine, contain or protect something or someone. A cage can serve many purposes, including keeping an animal in captivity, capturing, in history, prisoners were sometimes kept in a cage. They would sometimes be chained up inside into uncomfortable positions to intensify suffering, cages have been usually been used to capture or trapping a certain life form. For this reason, theyve been known as a hunting accessory, cages are often used now as a source to confine animals. These provide as a habitat to the animal, and since theyve advanced so greatly, captive breeds of birds, rodents, reptiles, and even larger animals have also been known to be confined in a cage as a domesticated animal. Captivity is a purpose of the cage. Cages also serve a purpose as a tool, often used to seize an animal. This is a common and illegal purpose of the cage, as poaching is illegal itself and these type of cages are used to trap an animal, or hold them for a certain period of time. U. S. President Theodore Roosevelt used a cage himself to capture a bear, hutch Birdcage Cat enclosure Gibbet Fancy mouse
Cage (enclosure)
–
A cage designed to contain small animals
Cage (enclosure)
–
The hand of a
marmoset caged at a
butterfly park
Cage (enclosure)
–
A legal rabbit hunting trap
7.
Cylinder (geometry)
–
In its simplest form, a cylinder is the surface formed by the points at a fixed distance from a given straight line called the axis of the cylinder. It is one of the most basic curvilinear geometric shapes, commonly the word cylinder is understood to refer to a finite section of a right circular cylinder having a finite height with circular ends perpendicular to the axis as shown in the figure. If the ends are open, it is called an open cylinder, if the ends are closed by flat surfaces it is called a solid cylinder. The formulae for the area and the volume of such a cylinder have been known since deep antiquity. The area of the side is known as the lateral area. An open cylinder does not include either top or bottom elements, the surface area of a closed cylinder is made up the sum of all three components, top, bottom and side. Its surface area is A = 2πr2 + 2πrh = 2πr = πd=L+2B, for a given volume, the closed cylinder with the smallest surface area has h = 2r. Equivalently, for a surface area, the closed cylinder with the largest volume has h = 2r. Cylindric sections are the intersections of cylinders with planes, for a right circular cylinder, there are four possibilities. A plane tangent to the cylinder meets the cylinder in a straight line segment. Moved while parallel to itself, the plane either does not intersect the cylinder or intersects it in two line segments. All other planes intersect the cylinder in an ellipse or, when they are perpendicular to the axis of the cylinder, a cylinder whose cross section is an ellipse, parabola, or hyperbola is called an elliptic cylinder, parabolic cylinder, or hyperbolic cylinder respectively. Elliptic cylinders are also known as cylindroids, but that name is ambiguous, as it can also refer to the Plücker conoid. The volume of a cylinder with height h is V = ∫0 h A d x = ∫0 h π a b d x = π a b ∫0 h d x = π a b h. Even more general than the cylinder is the generalized cylinder. The cylinder is a degenerate quadric because at least one of the coordinates does not appear in the equation, an oblique cylinder has the top and bottom surfaces displaced from one another. There are other unusual types of cylinders. Let the height be h, internal radius r, and external radius R, the volume is given by V = π h
Cylinder (geometry)
–
Tycho Brahe Planetarium building, Copenhagen, its roof being an example of a cylindric section
Cylinder (geometry)
–
A right circular cylinder with radius r and height h.
Cylinder (geometry)
–
In
projective geometry, a cylinder is simply a cone whose
apex is at infinity, which corresponds visually to a cylinder in perspective appearing to be a cone towards the sky.
8.
Riprap
–
It is made from a variety of rock types, commonly granite or limestone, and occasionally concrete rubble from building and paving demolition. It can be used on any waterway or water containment where there is potential for water erosion, underwater, rock armour caps submerged tunnels to protect against accidental anchor strikes or sinking debris. Ciria-CUR - Rock Manual - The use of rock in hydraulic engineering, allsop - Breakwaters, coastal structures and coastlines
Riprap
–
Riprap lining a
lake shore
Riprap
–
Concrete rubble used as riprap along the
San Francisco Bay shoreline
Riprap
–
Riprap stairway
Riprap
–
Crews replacing riprap at
Galveston Seawall after a 1915 hurricane
9.
Artillery
–
Artillery is a class of large military weapons built to fire munitions far beyond the range and power of infantrys small arms. Early artillery development focused on the ability to breach fortifications, and led to heavy, as technology improved, lighter, more mobile field artillery developed for battlefield use. This development continues today, modern self-propelled artillery vehicles are highly mobile weapons of great versatility providing the largest share of an armys total firepower, in its earliest sense, the word artillery referred to any group of soldiers primarily armed with some form of manufactured weapon or armour. In common speech, the artillery is often used to refer to individual devices, along with their accessories and fittings. However, there is no generally recognised generic term for a gun, howitzer, mortar, and so forth, the United States uses artillery piece, the projectiles fired are typically either shot or shell. Shell is a widely used term for a projectile, which is a component of munitions. By association, artillery may also refer to the arm of service that customarily operates such engines, in the 20th Century technology based target acquisition devices, such as radar, and systems, such as sound ranging and flash spotting, emerged to acquire targets, primarily for artillery. These are usually operated by one or more of the artillery arms, Artillery originated for use against ground targets—against infantry, cavalry and other artillery. An early specialist development was coastal artillery for use against enemy ships, the early 20th Century saw the development of a new class of artillery for use against aircraft, anti-aircraft guns. Artillery is arguably the most lethal form of land-based armament currently employed, the majority of combat deaths in the Napoleonic Wars, World War I, and World War II were caused by artillery. In 1944, Joseph Stalin said in a speech that artillery was the God of War, although not called as such, machines performing the role recognizable as artillery have been employed in warfare since antiquity. The first references in the historical tradition begin at Syracuse in 399 BC. From the Middle Ages through most of the era, artillery pieces on land were moved by horse-drawn gun carriages. In the contemporary era, the artillery and crew rely on wheeled or tracked vehicles as transportation, Artillery used by naval forces has changed significantly also, with missiles replacing guns in surface warfare. The engineering designs of the means of delivery have likewise changed significantly over time, in some armies, the weapon of artillery is the projectile, not the equipment that fires it. The process of delivering fire onto the target is called gunnery, the actions involved in operating the piece are collectively called serving the gun by the detachment or gun crew, constituting either direct or indirect artillery fire. The term gunner is used in armed forces for the soldiers and sailors with the primary function of using artillery. The gunners and their guns are usually grouped in teams called either crews or detachments, several such crews and teams with other functions are combined into a unit of artillery, usually called a battery, although sometimes called a company
Artillery
–
French naval piece of the late 19th century
Artillery
–
French soldiers in the
Franco-Prussian War 1870–71.
Artillery
–
British 64 Pounder Rifled Muzzle-Loaded (RML) Gun on a Moncrieff disappearing mount, at Scaur Hill Fort,
Bermuda. This is a part of a fixed battery, meant to protect against over-land attack and to serve as coastal artillery.
Artillery
–
7-person gun crew firing a US
M777 Light Towed Howitzer,
War in Afghanistan, 2009.
10.
Leonardo da Vinci
–
He has been variously called the father of palaeontology, ichnology, and architecture, and is widely considered one of the greatest painters of all time. Sometimes credited with the inventions of the parachute, helicopter and tank, many historians and scholars regard Leonardo as the prime exemplar of the Universal Genius or Renaissance Man, an individual of unquenchable curiosity and feverishly inventive imagination. Much of his working life was spent in the service of Ludovico il Moro in Milan. He later worked in Rome, Bologna and Venice, and he spent his last years in France at the home awarded to him by Francis I of France, Leonardo was, and is, renowned primarily as a painter. Among his works, the Mona Lisa is the most famous and most parodied portrait, Leonardos drawing of the Vitruvian Man is also regarded as a cultural icon, being reproduced on items as varied as the euro coin, textbooks, and T-shirts. Perhaps fifteen of his paintings have survived, Leonardo is revered for his technological ingenuity. He conceptualised flying machines, a type of armoured fighting vehicle, concentrated power, an adding machine. Some of his inventions, however, such as an automated bobbin winder. A number of Leonardos most practical inventions are nowadays displayed as working models at the Museum of Vinci. He made substantial discoveries in anatomy, civil engineering, geology, optics, and hydrodynamics, today, Leonardo is widely considered one of the most diversely talented individuals ever to have lived. Leonardo was born on 15 April 1452 at the hour of the night in the Tuscan hill town of Vinci. He was the son of the wealthy Messer Piero Fruosino di Antonio da Vinci, a Florentine legal notary, and Caterina. Leonardo had no surname in the modern sense – da Vinci simply meaning of Vinci, his birth name was Lionardo di ser Piero da Vinci, meaning Leonardo. The inclusion of the title ser indicated that Leonardos father was a gentleman, little is known about Leonardos early life. He spent his first five years in the hamlet of Anchiano in the home of his mother and his father had married a sixteen-year-old girl named Albiera Amadori, who loved Leonardo but died young in 1465 without children. When Leonardo was sixteen, his father married again to twenty-year-old Francesca Lanfredini, pieros legitimate heirs were born from his third wife Margherita di Guglielmo and his fourth and final wife, Lucrezia Cortigiani. Leonardo received an education in Latin, geometry and mathematics. In later life, Leonardo recorded only two childhood incidents, one, which he regarded as an omen, was when a kite dropped from the sky and hovered over his cradle, its tail feathers brushing his face
Leonardo da Vinci
–
Portrait of Leonardo
Leonardo da Vinci
–
Leonardo's childhood home in
Anchiano
Leonardo da Vinci
–
Leonardo's earliest known drawing, the Arno Valley (1473),
Uffizi
Leonardo da Vinci
–
The Baptism of Christ (1472–75)—
Uffizi, by Verrocchio and Leonardo
11.
Milan
–
Milan is a city in Italy, capital of the Lombardy region, and the most populous metropolitan area and the second most populous comune in Italy. The population of the city proper is 1,351,000, Milan has a population of about 8,500,000 people. It is the industrial and financial centre of Italy and one of global significance. In terms of GDP, it has the largest economy among European non-capital cities, Milan is considered part of the Blue Banana and lies at the heart of one of the Four Motors for Europe. Milan is an Alpha leading global city, with strengths in the arts, commerce, design, education, entertainment, fashion, finance, healthcare, media, services, research, and tourism. Its business district hosts Italys Stock Exchange and the headquarters of the largest national and international banks, the city is a major world fashion and design capital, well known for several international events and fairs, including Milan Fashion Week and the Milan Furniture Fair. The city hosts numerous cultural institutions, academies and universities, with 11% of the national total enrolled students, Milans museums, theatres and landmarks attract over 9 million visitors annually. Milan – after Naples – is the second Italian city with the highest number of accredited stars from the Michelin Guide, the city hosted the Universal Exposition in 1906 and 2015. Milan is home to two of Europes major football teams, A. C. Milan and F. C. Internazionale, the etymology of Milan is uncertain. One theory holds that the Latin name Mediolanum comes from the Latin words medio, however, some scholars believe lanum comes from the Celtic root lan, meaning an enclosure or demarcated territory in which Celtic communities used to build shrines. Hence, Mediolanum could signify the central town or sanctuary of a Celtic tribe, indeed, the name Mediolanum is borne by about sixty Gallo-Roman sites in France, e. g. Saintes and Évreux. Alciato credits Ambrose for his account, around 400 BC, the Celtic Insubres settled Milan and the surrounding region. In 222 BC, the Romans conquered the settlement, renaming it Mediolanum, Milan was eventually declared the capital of the Western Roman Empire by Emperor Diocletian in 286 AD. Diocletian chose to stay in the Eastern Roman Empire and his colleague Maximianus ruled the Western one, immediately Maximian built several monuments, such as a large circus 470 m ×85 m, the Thermae Herculeae, a large complex of imperial palaces and several other buildings. With the Edict of Milan of 313, Emperor Constantine I guaranteed freedom of religion for Christians, after the city was besieged by the Visigoths in 402, the imperial residence was moved to Ravenna. In 452, the Huns overran the city, in 539, the Ostrogoths conquered and destroyed Milan during the Gothic War against Byzantine Emperor Justinian I. In the summer of 569, a Teutonic tribe, the Lombards, conquered Milan, some Roman structures remained in use in Milan under Lombard rule. Milan surrendered to the Franks in 774 when Charlemagne took the title of King of the Lombards, the Iron Crown of Lombardy dates from this period
Milan
–
Milan Cathedral,
La Scala opera house and
Porta Nuova business district
Milan
Milan
Milan
12.
Patent
–
A patent is a set of exclusive rights granted by a sovereign state to an inventor or assignee for a limited period of time in exchange for detailed public disclosure of an invention. An invention is a solution to a technological problem and is a product or a process. Patents are a form of intellectual property, the procedure for granting patents, requirements placed on the patentee, and the extent of the exclusive rights vary widely between countries according to national laws and international agreements. Typically, however, a patent application must include one or more claims that define the invention. A patent may include many claims, each of which defines a specific property right and these claims must meet relevant patentability requirements, such as novelty, usefulness, and non-obviousness. Nevertheless, there are variations on what is patentable subject matter from country to country, the word patent originates from the Latin patere, which means to lay open. More directly, it is a version of the term letters patent. Similar grants included land patents, which were land grants by early state governments in the USA, and printing patents, a precursor of modern copyright. In modern usage, the term patent usually refers to the granted to anyone who invents any new, useful. The additional qualification utility patent is used to distinguish the primary meaning from these other types of patents. Particular species of patents for inventions include biological patents, business method patents, chemical patents, the period of protection was 10 years. These were mostly in the field of glass making, as Venetians emigrated, they sought similar patent protection in their new homes. This led to the diffusion of patent systems to other countries, by the 16th century, the English Crown would habitually abuse the granting of letters patent for monopolies. After public outcry, King James I of England was forced to revoke all existing monopolies, the Statute became the foundation for later developments in patent law in England and elsewhere. Important developments in patent law emerged during the 18th century through a process of judicial interpretation of the law. During the reign of Queen Anne, patent applications were required to supply a complete specification of the principles of operation of the invention for public access. Influenced by the philosophy of John Locke, the granting of patents began to be viewed as a form of property right. The English legal system became the foundation for patent law in countries with a common law heritage, including the United States, New Zealand, in the Thirteen Colonies, inventors could obtain patents through petition to a given colonys legislature
Patent
–
U.S patent
Patent
–
James Puckle 's 1718
early autocannon was one of the first inventions required to provide a specification for a patent.
Patent
–
The plate of the Martin
ejector seat of a military aircraft, stating that the design is covered by multiple patents in Britain, South Africa, Canada and "others".
Dübendorf Museum of Military Aviation.
13.
Erosion
–
In earth science, erosion is the action of surface processes that remove soil, rock, or dissolved material from one location on the Earths crust, then transport it away to another location. Eroded sediment or solutes may be transported just a few millimetres, the rates at which such processes act control how fast a surface is eroded. Feedbacks are also possible between rates of erosion and the amount of eroded material that is carried by, for example. Processes of erosion that produce sediment or solutes from a place contrast with those of deposition, while erosion is a natural process, human activities have increased by 10-40 times the rate at which erosion is occurring globally. At well-known agriculture sites such as the Appalachian Mountains, intensive farming practices have caused erosion up to 100x the speed of the rate of erosion in the region. Excessive erosion causes both on-site and off-site problems, on-site impacts include decreases in agricultural productivity and ecological collapse, both because of loss of the nutrient-rich upper soil layers. In some cases, the end result is desertification. Off-site effects include sedimentation of waterways and eutrophication of bodies, as well as sediment-related damage to roads. Intensive agriculture, deforestation, roads, anthropogenic climate change and urban sprawl are amongst the most significant human activities in regard to their effect on stimulating erosion, however, there are many prevention and remediation practices that can curtail or limit erosion of vulnerable soils. Rainfall, and the surface runoff which may result from rainfall, produces four types of soil erosion, splash erosion, sheet erosion, rill erosion. Splash erosion is generally seen as the first and least severe stage in the erosion process. In splash erosion, the impact of a falling raindrop creates a crater in the soil. The distance these soil particles travel can be as much as 0.6 m vertically and 1.5 m horizontally on level ground. If the soil is saturated, or if the rate is greater than the rate at which water can infiltrate into the soil. If the runoff has sufficient flow energy, it will transport loosened soil particles down the slope, sheet erosion is the transport of loosened soil particles by overland flow. Rill erosion refers to the development of small, ephemeral concentrated flow paths which function as both sediment source and sediment delivery systems for erosion on hillslopes, generally, where water erosion rates on disturbed upland areas are greatest, rills are active. Flow depths in rills are typically of the order of a few centimetres or less and this means that rills exhibit hydraulic physics very different from water flowing through the deeper, wider channels of streams and rivers. Gully erosion occurs when water accumulates and rapidly flows in narrow channels during or immediately after heavy rains or melting snow
Erosion
–
An actively eroding
rill on an
intensively-farmed field in
eastern Germany
Erosion
–
A
natural arch produced by the wind erosion of differentially weathered rock in Jebel Kharaz,
Jordan.
Erosion
–
A wave-like sea cliff produced by
coastal erosion, in Jinshitan Coastal National Geopark,
Dalian,
Liaoning Province,
China.
Erosion
–
Soil and water being
splashed by the impact of a single
raindrop.
14.
Noise barrier
–
A noise barrier is an exterior structure designed to protect inhabitants of sensitive land use areas from noise pollution. Noise barriers are the most effective method of mitigating roadway, railway, extensive use of noise barriers began in the United States after noise regulations were introduced in the early 1970s. Noise barriers have been built in the United States since the mid-twentieth century, i-680 in Milpitas, California was the first noise barrier. In the late 1960s, analytic acoustical technology emerged to mathematically evaluate the efficacy of a noise barrier design adjacent to a specific roadway, by the 1990s, noise barriers that included use of transparent materials were being designed in Denmark and other western European countries. Below, a researcher collects data to calibrate a roadway noise model for Foothill Expressway, the best of these early computer models considered the effects of roadway geometry, topography, vehicle volumes, vehicle speeds, truck mix, roadway surface type, and micro-meteorology. Possibly the earliest published work that scientifically designed a specific noise barrier was the study for the Foothill Expressway in Los Altos, numerous case studies across the U. S. soon addressed dozens of different existing and planned highways. Most were commissioned by state departments and conducted by one of the four research groups mentioned above. With passage of the Noise Control Act of 1972, demand for noise barrier design soared from a host of noise regulation spinoff. By the late 1970s, more than a dozen research groups in the U. S. were applying similar computer modeling technology, as of 2006, this technology is considered a standard in the evaluation of noise pollution from highways. The nature and accuracy of the models used is nearly identical to the original 1970s versions of the technology. The acoustical science of noise barrier design is based upon treating an airway or railway as a line source, the theory is based upon blockage of sound ray travel toward a particular receptor, however, diffraction of sound must be addressed. Sound waves bend when they pass an edge, such as the apex of a noise barrier, barriers that block line of sight of a highway or other source will therefore block more sound. Further complicating matters is the phenomenon of refraction, the bending of sound rays in the presence of an inhomogeneous atmosphere, wind shear and thermocline produce such inhomogeneities. The sound sources modeled must include engine noise, tire noise, the noise barrier may be constructed on private land, on a public right-of-way, or on other public land. Because sound levels are measured using a scale, a reduction of nine decibels is equivalent to elimination of approximately 86 percent of the unwanted sound power. Several different materials may be used for sound barriers and these materials can include masonry, earthwork, steel, concrete, wood, plastics, insulating wool, or composites. Walls that are made of absorptive material mitigate sound differently than hard surfaces, a wall with porous surface material and sound-dampening content material can be absorptive where little or no noise is reflected back towards the source or elsewhere. Hard surfaces such as masonry or concrete are considered to be reflective where most of the noise is reflected back towards the noise source, Noise barriers can be effective tools for noise pollution abatement, but certain locations and topographies are not suitable for use of noise barriers
Noise barrier
–
The
sound tube in
Melbourne,
Australia, designed to reduce roadway noise without detracting from the area's aesthetics.
Noise barrier
–
Acoustical
scientist measures sound in noise barrier design study,
Santa Clara County, California.
Noise barrier
–
Noise barrier earth berm along
California State Route 12,
Sonoma County, California
Noise barrier
–
This noise abatement wall in The Netherlands has a transparent section at the driver's eye-level to reduce the visual impact for road users.
15.
Silt
–
Silt is granular material of a size between sand and clay, whose mineral origin is quartz and feldspar. Silt may occur as a soil or as sediment mixed in suspension with water in a body of such as a river. It may also exist as soil deposited at the bottom of a water body, Silt has a moderate specific area with a typically non-sticky, plastic feel. Silt usually has a floury feel when dry, and a slippery feel when wet, Silt can be visually observed with a hand lens. Silt is created by a variety of physical processes capable of splitting the generally sand-sized quartz crystals of primary rocks by exploiting deficiencies in their lattice and these involve chemical weathering of rock and regolith, and a number of physical weathering processes such as frost shattering and haloclasty. The main process is abrasion through transport, including fluvial comminution, aeolian attrition and it is in semi-arid environments that substantial quantities of silt are produced. Silt is sometimes known as rock flour or stone dust, especially produced by glacial action. Mineralogically, silt is composed mainly of quartz and feldspar, sedimentary rock composed mainly of silt is known as siltstone. Liquefaction created by an earthquake is silt suspended in water that is hydrodynamically forced up from below ground level. In the Udden–Wentworth scale, silt particles range between 0.0039 and 0.0625 mm, larger than clay but smaller than sand particles, ISO14688 grades silts between 0.002 mm and 0.063 mm. In actuality, silt is chemically distinct from clay, and unlike clay, grains of silt are approximately the size in all dimensions, furthermore. Clays are formed from thin plate-shaped particles held together by electrostatic forces, according to the U. S. Department of Agriculture Soil Texture Classification system, the sand-silt distinction is made at the 0.05 mm particle size. The USDA system has been adopted by the Food and Agriculture Organization, in the Unified Soil Classification System and the AASHTO Soil Classification system, the sand-silt distinction is made at the 0.075 mm particle size. Silts and clays are distinguished mechanically by their plasticity, Silt is easily transported in water or other liquid and is fine enough to be carried long distances by air in the form of dust. Thick deposits of silty material resulting from deposition by aeolian processes are called loess. Silt and clay contribute to turbidity in water, Silt is transported by streams or by water currents in the ocean. When silt appears as a pollutant in water the phenomenon is known as siltation, Silt, deposited by annual floods along the Nile River, created the rich, fertile soil that sustained the Ancient Egyptian civilization. In south east Bangladesh, in the Noakhali district, cross dams were built in the 1960s whereby silt gradually started forming new land called chars, the district of Noakhali has gained more than 28 square miles of land in the past 50 years
Silt
–
A silted lake located in
Eichhorst,
Germany
16.
Fish screen
–
They are intended to supply debris-free water without harming aquatic life. However, many fish are killed or injured on screens or elsewhere in the intake structures, Fish screens may be positive barriers or behavioral barriers. Most behavioral barriers are experimental and of unproven effectiveness, positive barriers are often effective at keeping aquatic organisms from entering a cooling system, but may also kill them by impinging them on the screens. Some fish screens are designed to protect a species of fish and are not necessarily effective at protecting other fish species. Some screens are capable of protecting more than one species or type of life, additionally, some screens may effectively protect juvenile and adult fish, but not fish eggs and larvae. Maintenance costs can be significant, including repairs, removing trash, for some low volume, non-industrial water diversion applications, there are screens available that have no moving parts, do not require electricity, and have very little need for maintenance. Many power plants and other industries in the U. S. continue to use screens that impinge fish, for example, the cooling system at the Indian Point Energy Center in New York kills over a billion fish eggs and larvae annually. At the Bay Shore Power Plant in Ohio,46 million fish were killed over an 18-month period, organisms that pass through the screens are killed or stressed as they become entrained in the cooling system. 208 million fish eggs and over 2 billion small and larval fish were entrained at the Bay Shore plant over the same 18 months, EPA estimates that billions of fish and other organisms are killed each year in cooling water intakes. Some existing unscreened diversions whose construction pre-dates fish-screen mandates are allowed to continue operating by grandfather rule, the U. S. Clean Water Act requires EPA to issue regulations on industrial cooling water intake structures. The agency issued regulations for new facilities in 2001, and for existing facilities in 2014. Fish ladder Fish weir Cooling Water Intakes - U. S. EPA regulatory program Farmers Screen, The Installation Process - Time lapse video of a small modular fish screen being installed in Idaho
Fish screen
–
Fish screen at Redlands Canal, near
Grand Junction, Colorado
Fish screen
–
Diagram of typical vertical traveling screens used with industrial cooling water intake structures
Fish screen
–
The
Indian Point Energy Center in New York. Over a billion fish eggs and larvae are killed in its cooling system each year.
Fish screen
–
Fisheries science
17.
Retaining wall
–
A retaining wall is a structure designed and constructed to resist the lateral pressure of soil, when there is a desired change in ground elevation that exceeds the angle of repose of the soil. A basement wall is one kind of retaining wall. But the term refers to a cantilever retaining wall, which is a freestanding structure without lateral support at its top. These are cantilevered from a footing and rise above the grade on one side to retain a level grade on the opposite side. The walls must resist the pressures generated by loose soils or, in some cases. Every retaining wall supports a “wedge” of soil, the wedge is defined as the soil which extends beyond the failure plane of the soil type present at the wall site, and can be calculated once the soil friction angle is known. As the setback of the wall increases, the size of the wedge is reduced. This reduction lowers the pressure on the retaining wall, the most important consideration in proper design and installation of retaining walls is to recognize and counteract the tendency of the retained material to move downslope due to gravity. Lateral earth pressures are zero at the top of the wall, earth pressures will push the wall forward or overturn it if not properly addressed. Also, any groundwater behind the wall that is not dissipated by a system causes hydrostatic pressure on the wall. The total pressure or thrust may be assumed to act at one-third from the lowest depth for lengthwise stretches of uniform height. Unless the wall is designed to retain water, It is important to have proper drainage behind the wall in order to limit the pressure to the design value. Drainage materials will reduce or eliminate the pressure and improve the stability of the material behind the wall. Drystone retaining walls are normally self-draining.5 against lateral sliding and overturning, gravity walls depend on their mass to resist pressure from behind and may have a batter setback to improve stability by leaning back toward the retained soil. For short landscaping walls, they are made from mortarless stone or segmental concrete units. Dry-stacked gravity walls are somewhat flexible and do not require a rigid footing, earlier in the 20th century, taller retaining walls were often gravity walls made from large masses of concrete or stone. Cantilevered retaining walls are made from a stem of steel-reinforced. These walls cantilever loads to a large, structural footing, converting horizontal pressures from behind the wall to vertical pressures on the ground below, sometimes cantilevered walls are buttressed on the front, or include a counterfort on the back, to improve their strength resisting high loads
Retaining wall
–
A
gravity -type
stone retaining wall
Retaining wall
Retaining wall
–
Various types of retaining walls
Retaining wall
–
Construction types of gravity retaining walls
18.
Batter (walls)
–
Batter in construction is a receding slope of a wall, structure, or earthwork. A wall sloping in the direction is said to overhang. The term is used with buildings and non-building structures to identify when a wall is built with an inward slope. A battered corner is an architectural feature using batters, a batter is sometimes used in foundations, retaining walls, dry stone walls, dams, lighthouses, and fortifications. The batter angle is typically described as a ratio of the offset and height or a degree angle
Batter (walls)
–
The walls of this octagonal, stone pavilion in India are battered.
Batter (walls)
–
A batter frame is used to guide the construction of a battered stone wall.
Batter (walls)
–
Batter describes the intentional inclination of these
pilings.
Batter (walls)
–
Battered buttresses reinforce this wall.
19.
Subsidence
–
Subsidence is the motion of a surface as it shifts downward relative to a datum such as sea level. The opposite of subsidence is uplift, which results in an increase in elevation, ground subsidence is of concern to geologists, geotechnical engineers and surveyors. Subsidence frequently causes problems in karst terrains, where dissolution of limestone by fluid flow in the subsurface causes the creation of voids. If the roof of these voids becomes too weak, it can collapse and this type of subsidence can result in sinkholes which can be many hundreds of meters deep. Several types of mining, and specifically methods which intentionally cause the extracted void to collapse will result in surface subsidence. Mining-induced subsidence is relatively predictable in its magnitude, manifestation and extent, mining-induced subsidence is nearly always very localized to the surface above the mined area, plus a margin around the outside. Where mining activity is planned, mining-induced subsidence can be successfully managed if there is co-operation from all of the stakeholders and this is accomplished through a combination of careful mine planning, the taking of preventive measures, and the carrying out of repairs post-mining. If natural gas is extracted from a gas field the initial pressure in the field will drop over the years. The gas pressure also supports the soil layers above the field, if the pressure drops, the soil pressure increases and this leads to subsidence at the ground level. Since exploitation of the Slochteren gas field started in the late 1960s the ground level over a 250 km² area has dropped by a current maximum of 30 cm, the Geospatial Information Authority of Japan reported immediate subsidence caused by the 2011 Tōhoku earthquake. In Northern Japan, subsidence of 0.50 m was observed on the coast of the Pacific Ocean in Miyako, Tōhoku, while Rikuzentakata, in the south at Sōma, Fukushima,0.29 m was observed. The maximum amount of subsidence was 1.2 m, coupled with horizontal diastrophism of up to 5.3 m on the Oshika Peninsula in Miyagi Prefecture, the habitation of lowlands, such as coastal or delta plains, requires drainage. The resulting aeration of the leads to the oxidation of its organic components, such as peat. This applies especially when water levels are periodically adapted to subsidence, in order to maintain desired unsaturated zone depths. In addition to this, drained soils consolidate as a result of increased effective stress, in this way, land subsidence has the potential of becoming self-perpetuating, having rates up to 5 cm/yr. Water management used to be tuned primarily to such as crop optimisation but, to varying extents. When differential stresses exist in the Earth, these can be accommodated either by geological faulting in the brittle crust, or by flow in the hotter. Where faults occur, absolute subsidence may occur in the wall of normal faults
Subsidence
–
Subsided house, called
The Crooked House, the result of 19th century mining subsidence.
Subsidence
–
A
road destroyed by subsidence and
shear, near
Castleton,
Derbyshire.
Subsidence
–
San Joaquin Valley subsidence
20.
Cut (earthmoving)
–
In civil engineering, a cut or cutting is where soil or rock material from a hill or mountain is cut out to make way for a canal, road or railway line. In cut and fill construction it keeps the route straight and/or flat, contrary to the general meaning of cutting, a cutting in construction is mechanically excavated or blasted out with explosives. Some cuts are make on one side of a slope, others directly through the middle or top of a hill, generally, a cut is open at the top. A cut is the opposite of an embankment, cuts are typically used to reduce the length and the grade of a route. Cuts can be created by multiple passes of a shovel, grader, scraper or excavator, or by blasting, one unusual means of creating a cut is to remove the roof of a tunnel through daylighting. Material removed from cuts is ideally balanced by material needed for fills along the same route, the word is also used in the same sense in mining, as in an open cut mine. The term cutting appears in the 19th century literature to designate rock cuts developed to moderate grades of railway lines, railway Ages Comprehensive Railroad Dictionary defines a cut as a passage cut for the roadway through an obstacle of rock or dirt. There are at least two types of cut, sidehill cut and through cut, the former permits passage of a transportation route alongside of or around a hill, where the slope is transverse to the roadway. A sidehill cut can be formed by means of sidecasting, i. e. cutting on the high side balanced by moving the material to build up the low side to achieve a flat surface for the route. In contrast, through cuts, where the adjacent grade is higher on both sides of the route, require removal of material from the area since it cannot be dumped alongside the route. S. Route 23 in Kentucky Cut-and-cover Embankment Trench Dashrath Manjhi Flying arch, use of a dummy arch bridge to stabilise cutting walls against landslip
Cut (earthmoving)
–
Road cutting
Cut (earthmoving)
–
Talerddig cutting through the
Cambrian Mountains,
Wales in 2001. Created as part of the
Newtown and Machynlleth Railway, with a depth of 120 feet (37 m), it was the deepest cutting in the world at the time of its opening in the early 1860s. The original near-vertical sides have since been trimmed back
Cut (earthmoving)
–
Open-cut station of the
New York City Subway
Cut (earthmoving)
–
Excavation of Olive Mount, Liverpool. Watercolour by T.T.Bury (1833) The cutting was 20 ft (6.1 m) wide and 70 ft (21.3 m) deep. Construction required the removal of 480,000 cubic yards of sandstone.
21.
Dominus Estate
–
Dominus Estate, is a California wine estate producing Bordeaux style blends, owned by Christian Moueix. The winery is located in Yountville within the Napa Valley AVA, yount, the founder of Yountville, planted in 1836 the first vines of the valley on the location of Napanook vineyard. Daniel Baron became general manager of Dominus in the 1980s, Moueix, also in charge of production at Château Pétrus and president of Établissements Jean-Pierre Moueix, became the sole owner of Dominus Estate when Lail and Smith sold their shares in 1995. Napanook, the second wine, was first released in 1996. The architects first U. S. project, it was constructed from stone-filled gabions to provide protection from scorching heat by day, the annual production is 7,500 to 12,000 cases which includes both Dominus and Napanook
Dominus Estate
–
A bottle of 2002 Dominus.
22.
Napa County, California
–
Napa County is a county located north of San Pablo Bay in the northern portion of the U. S. state of California. As of the 2010 census, the population was 136,484, the county seat is the City of Napa. Napa County was one of the counties of California, created in 1850 at the time of statehood. Parts of the territory were given to Lake County in 1861. Napa County comprises the Napa, CA Metropolitan Statistical Area, which is included in the San Jose-San Francisco-Oakland. It is one of four North Bay counties, in prehistoric times, the valley was inhabited by the Patwin Native Americans, with possible habitation by Wappo tribes in the northwestern foothills. Most villages are thought to have been constructed near the floodplains of watercourses that drain the valley and their food consisted of wild roots, acorns, small animals, earthworms, grasshoppers, and bread made from crushed California buckeye kernels. In winter they would construct huts made of tree branches, in summer they camped near rivers and streams. In winter months, they were clad in wild animal skins. The maximum prehistoric population is not to have exceeded 5000 persons. In 1776, a fort was erected by the Spanish Governor, Felipe de Neve a short distance northwest of Napa, francis Castro and Father Jose Altimura were the first Europeans to explore the Napa Valley in 1823. When the first white settlers arrived in the early 1830s, there were six tribes in the valley speaking different dialects, the Mayacomos tribe lived in the area where Calistoga was founded. The Callajomans were in the area near where the town of St. Helena now stands, further south, the Kymus dwelt in the middle part of the valley. The Napa and Ulcus tribes occupied part of the area where the City of Napa now exists while the Soscol tribe occupied the portion that now makes up the end of the valley. Many of the native peoples died during an epidemic in 1838. Settlers also killed several over claims of cattle theft, during the era between 1836 and 1846, when California was a province of independent Mexico, the following 13 ranchos were granted in Napa County, George C. Yount was a settler in Napa County and is believed to be the first Anglo-Saxon resident in the county. In 1836 Yount obtained the Mexican grant Rancho Caymus where he built what is said to be the first log house in California, soon afterward, he built a sawmill and grain mill, and was the first person to plant a vineyard in the county
Napa County, California
Napa County, California
Napa County, California
Napa County, California
23.
California
–
California is the most populous state in the United States and the third most extensive by area. Located on the western coast of the U. S, California is bordered by the other U. S. states of Oregon, Nevada, and Arizona and shares an international border with the Mexican state of Baja California. Los Angeles is Californias most populous city, and the second largest after New York City. The Los Angeles Area and the San Francisco Bay Area are the nations second- and fifth-most populous urban regions, California also has the nations most populous county, Los Angeles County, and its largest county by area, San Bernardino County. The Central Valley, an agricultural area, dominates the states center. What is now California was first settled by various Native American tribes before being explored by a number of European expeditions during the 16th and 17th centuries, the Spanish Empire then claimed it as part of Alta California in their New Spain colony. The area became a part of Mexico in 1821 following its war for independence. The western portion of Alta California then was organized as the State of California, the California Gold Rush starting in 1848 led to dramatic social and demographic changes, with large-scale emigration from the east and abroad with an accompanying economic boom. If it were a country, California would be the 6th largest economy in the world, fifty-eight percent of the states economy is centered on finance, government, real estate services, technology, and professional, scientific and technical business services. Although it accounts for only 1.5 percent of the states economy, the story of Calafia is recorded in a 1510 work The Adventures of Esplandián, written as a sequel to Amadis de Gaula by Spanish adventure writer Garci Rodríguez de Montalvo. The kingdom of Queen Calafia, according to Montalvo, was said to be a land inhabited by griffins and other strange beasts. This conventional wisdom that California was an island, with maps drawn to reflect this belief, shortened forms of the states name include CA, Cal. Calif. and US-CA. Settled by successive waves of arrivals during the last 10,000 years, various estimates of the native population range from 100,000 to 300,000. The Indigenous peoples of California included more than 70 distinct groups of Native Americans, ranging from large, settled populations living on the coast to groups in the interior. California groups also were diverse in their organization with bands, tribes, villages. Trade, intermarriage and military alliances fostered many social and economic relationships among the diverse groups, the first European effort to explore the coast as far north as the Russian River was a Spanish sailing expedition, led by Portuguese captain Juan Rodríguez Cabrillo, in 1542. Some 37 years later English explorer Francis Drake also explored and claimed a portion of the California coast in 1579. Spanish traders made unintended visits with the Manila galleons on their trips from the Philippines beginning in 1565
California
–
A forest of redwood trees in
Redwood National Park
California
–
Flag
California
–
Mount Shasta
California
–
Aerial view of the
California Central Valley
24.
Geotextile
–
Geotextiles are permeable fabrics which, when used in association with soil, have the ability to separate, filter, reinforce, protect, or drain. Typically made from polypropylene or polyester, geotextile fabrics come in three forms, woven, needle punched, or heat bonded. Geotextile composites have been introduced and products such as geogrids and meshes have been developed, Geotextiles were originally intended to be an alternative to granular soil filters. The original, and still used, term for geotextiles is filter fabrics. He used different styles of woven monofilament fabrics, all characterized by a high percentage open area. He discussed the need for both adequate permeability and soil retention, along with adequate strength and proper elongation and set the tone for geotextile use in filtration situations. Usually geotextiles are placed at the surface to strengthen the soil. Geotextiles are also used for sand dune armoring to protect upland coastal property from storm surge, wave action, a large sand-filled container within the dune system prevents storm erosion from proceeding beyond the SFC. Using a sloped unit rather than a single tube eliminates damaging scour, erosion control manuals comment on the effectiveness of sloped, stepped shapes in mitigating shoreline erosion damage from storms. Geotextile sand-filled units provide a soft armoring solution for upland property protection, Geotextiles are used as matting to stabilize flow in stream channels and swales. Geotextiles can improve soil strength at a lower cost than conventional soil nailing, in addition, geotextiles allow planting on steep slopes, further securing the slope. Geotextiles have been used to protect the fossil footprints of Laetoli in Tanzania from erosion, rain. In building demolition, geotextile fabrics in combination with wire fencing can contain explosive debris. Coir geotextiles are popular for erosion control, slope stabilization and bioengineering, coir geotextiles last approximately 3 to 5 years depending on the fabric weight. The product degrades into humus, enriching the soil, hard landscape materials Sediment control Koerner, R. M. Designing With Geosynthetics, 6th Edition, Xlibris Publishing Co.914 pgs. Geotextiles, From Design to Applications, Woodhead Publishing Co, john, N. W. M. Geotextiles, Blackie Publishing Ltd
Geotextile
–
Examples of geotextiles
Geotextile
–
A
silt fence on a construction site.
25.
Trapezoid
–
The parallel sides are called the bases of the trapezoid and the other two sides are called the legs or the lateral sides. A scalene trapezoid is a trapezoid with no sides of equal measure, the first recorded use of the Greek word translated trapezoid was by Marinus Proclus in his Commentary on the first book of Euclids Elements. This article uses the term trapezoid in the sense that is current in the United States, in many other languages using a word derived from the Greek for this figure, the form closest to trapezium is used. A right trapezoid has two adjacent right angles, right trapezoids are used in the trapezoidal rule for estimating areas under a curve. An acute trapezoid has two adjacent acute angles on its longer base edge, while an obtuse trapezoid has one acute, an acute trapezoid is also an isosceles trapezoid, if its sides have the same length, and the base angles have the same measure. An obtuse trapezoid with two pairs of sides is a parallelogram. A parallelogram has central 2-fold rotational symmetry, a Saccheri quadrilateral is similar to a trapezoid in the hyperbolic plane, with two adjacent right angles, while it is a rectangle in the Euclidean plane. A Lambert quadrilateral in the plane has 3 right angles. A tangential trapezoid is a trapezoid that has an incircle, there is some disagreement whether parallelograms, which have two pairs of parallel sides, should be regarded as trapezoids. Some define a trapezoid as a quadrilateral having one pair of parallel sides. Others define a trapezoid as a quadrilateral with at least one pair of parallel sides, the latter definition is consistent with its uses in higher mathematics such as calculus. The former definition would make such concepts as the trapezoidal approximation to a definite integral ill-defined and this article uses the inclusive definition and considers parallelograms as special cases of a trapezoid. This is also advocated in the taxonomy of quadrilaterals, under the inclusive definition, all parallelograms are trapezoids. Rectangles have mirror symmetry on mid-edges, rhombuses have mirror symmetry on vertices, while squares have mirror symmetry on both mid-edges and vertices. Four lengths a, c, b, d can constitute the sides of a non-parallelogram trapezoid with a and b parallel only when | d − c | < | b − a | < d + c. The quadrilateral is a parallelogram when d − c = b − a =0, the angle between a side and a diagonal is equal to the angle between the opposite side and the same diagonal. The diagonals cut each other in mutually the same ratio, the diagonals cut the quadrilateral into four triangles of which one opposite pair are similar. The diagonals cut the quadrilateral into four triangles of which one pair have equal areas
Trapezoid
–
The
Temple of Dendur in the
Metropolitan Museum of Art in
New York City
Trapezoid
–
Trapezoid
Trapezoid
–
Example of a trapeziform
pronotum outlined on a spurge bug
26.
Fort Stedman
–
The Battle of Fort Stedman, also known as the Battle of Hares Hill, was fought on March 25,1865, during the final days of the American Civil War. The Union Army fortification in the lines around Petersburg, Virginia, was attacked in a pre-dawn Confederate assault by troops led by Maj. Gen. John B. The attack was the last serious attempt by Confederate troops to break the Siege of Petersburg, after an initial success, Gordons men were driven back by Union troops of the IX Corps commanded by Maj. Gen. John G. Parke. Johnston, jointly defeat Sherman, and then go after Grant, third, on March 6, however, Gordon was summoned back to headquarters and Lee told him that there seemed to be but one thing that we could do—fight. It could only be if we fought and failed. Stedman, a Union colonel from Connecticut who had killed in the vicinity in August 1864. It was one of the closest spots to the Confederate works, there were fewer wooden chevaux de frise obstructions protecting it, Military Railroad was less than a mile behind the fort. Lee had also ordered the division of Maj. Gen. George Pickett of the First Corps to move from its north of the James River in time to join the action. Rooney Lees cavalry division was designated to exploit the expected infantry breakthrough, parkes 3rd Division, under Brig. Gen. John F. Hartranft, was in reserve behind the lines. While Maj. Gen. George G. Meade was away at City Point with Grant, Parke was the commander of the Army of the Potomac. Gordons attack started at 4,15 a. m, lead parties of sharpshooters and engineers masquerading as deserting soldiers headed out to overwhelm Union pickets and to remove obstructions that would delay the infantry advance. They were followed by three groups of 100 men assigned to storm the Union works and stream back into the Union rear area and these men relied on surprise and speed—they carried unloaded muskets so that no one could accidentally fire and alert the enemy. The main thrust was between Batteries XI and X, with one group moving north for Battery XI and the two for X and Stedman. Assuming that he had sealed the breach in the line. He suddenly realized that the men he was ordering were Confederates and they realized he was a Union general and he was taken back across no mans land and surrendered his sword personally to Gordon. Gordon soon arrived at Fort Stedman and found his attack had so far exceeded his most sanguine expectations, within minutes, Batteries X, XI, and XII and Fort Stedman had been seized, opening a gap nearly 1,000 feet long in the Union line. Confederate artillerists under Lt. Col. Robert M. Stribling used the guns in Stedman. The attack began having difficulty at Battery IX to the north, where the Union troops formed a battle line, Gordon turned his attention to the southern flank of his attack and Fort Haskell, against which he launched his division under Clement Evans
Fort Stedman
–
1865 photograph at Fort Stedman by
Timothy H. O'Sullivan.
Fort Stedman
–
Fort Stedman, 2009.
Fort Stedman
–
Maj. Gen.
John B. Gordon
Fort Stedman
–
Maj. Gen.
John G. Parke
27.
Wicker
–
Wicker is a kind of furniture woven from any one of a variety of cane-like materials, including rattan, willow, reed and bamboo. As such, it is not a material, but a technique. The word wicker is believed to be of Scandinavian origin, wika which means to bend in Swedish, Wicker is traditionally made of material of plant origin, but plastic fibers are now also used. Wicker is light yet sturdy, making it suitable for furniture that will be moved often like porch, a variety of plants are used such as reeds, grasses, creepers, and thin tree branches. Rushwork and wickerwork are terms used in England, Wicker has been documented as far back as ancient Egypt, made from indigenous reed and swamp grasses. Middle-class families could afford a few pieces, such as small tables. However, archaeologists working on the tombs of the wealthy pharaohs have uncovered a variety of wicker items, including chests, baskets, wig boxes. Wicker even found use in the Achaemenid Empire on the battlefield, the popularity of wicker passed from ancient Egypt and Persia to ancient Rome. Wicker baskets were used to carry items in Pompeii, furniture was manufactured out of wicker in the Roman style. It has been proposed that the use of wicker in the Iron Age may have influenced the development of the woven patterns used in Celtic art. By the 16th and 17th centuries, wicker was quite common in European countries like Portugal, Spain, Wicker received a boost during the Age of Exploration, when international sea traders returned from southeast Asia with a species of palm called rattan. Rattan is stronger than traditional European wicker materials, although the stem can be separated so the softer inner core can be used for wicker. The 19th century brought immense popularity for wicker in Europe, England and it was used outdoors as well as indoors. People in the Victorian Era believed it to be more sanitary than upholstered furniture and it was inexpensive, resisted harsh weather and was adaptable to many styles. In the United States, Cyrus Wakefield began constructing rattan furniture in the 1850s and he first used rattan that had been offloaded from ships, where it was used as ballast, but as his designs became well-known, he began importing the material himself. In recent times, its aesthetic was influenced heavily by the Arts and Crafts movement at the turn of the 20th century, Wicker is still a popular material. Antique wicker products are sought after by collectors. Reproductions of furniture and accent pieces are sold for indoor and outdoor use
Wicker
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A handmade wickerwork
cat tree
Wicker
Wicker
Wicker
28.
Fortification
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Fortifications are military constructions or buildings designed for the defense of territories in warfare, and also used to solidify rule in a region during peace time. Humans have constructed defensive works for many thousands of years, in a variety of increasingly complex designs, the term is derived from the Latin fortis and facere. From very early history to modern times, walls have been a necessity for cities to survive in a changing world of invasion. Some settlements in the Indus Valley Civilization were the first small cities to be fortified, in ancient Greece, large stone walls had been built in Mycenaean Greece, such as the ancient site of Mycenae. A Greek Phrourion was a collection of buildings used as a military garrison. These construction mainly served the purpose of a tower, to guard certain roads, passes. Though smaller than a fortress, they acted as a border guard rather than a real strongpoint to watch. The art of setting out a camp or constructing a fortification traditionally has been called castramentation since the time of the Roman legions. Fortification is usually divided into two branches, permanent fortification and field fortification, there is also an intermediate branch known as semi-permanent fortification. Castles are fortifications which are regarded as being distinct from the fort or fortress in that they are a residence of a monarch or noble. Roman forts and hill forts were the antecedents of castles in Europe. The Early Middle Ages saw the creation of towns built around castles. Medieval-style fortifications were made obsolete by the arrival of cannons in the 14th century. Fortifications in the age of black powder evolved into much lower structures with greater use of ditches and earth ramparts that would absorb, Walls exposed to direct cannon fire were very vulnerable, so were sunk into ditches fronted by earth slopes. The arrival of explosive shells in the 19th century led to yet another stage in the evolution of fortification, steel-and-concrete fortifications were common during the 19th and early 20th centuries. However the advances in warfare since World War I have made large-scale fortifications obsolete in most situations. Demilitarized zones along borders are arguably another type of fortification, although a passive kind, many military installations are known as forts, although they are not always fortified. Larger forts may be called fortresses, smaller ones were known as fortalices
Fortification
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Krak des Chevaliers is one of the best-preserved Crusader
castles.
Fortification
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Bourtange star fort, restored to 1750 situation,
Groningen (province),
Netherlands.
Fortification
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The well preserved
Bulgarian medieval fort
Baba Vida.
Fortification
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Fortifications on the Iraq-Iran Border, viewed from the
ISS, 2014
29.
Ammunition
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Ammunition is the general term used for the material fired, scattered, dropped or detonated from any weapon. The term ammunition can be traced back to the mid 17th century, broadly speaking, ammunition refers to both expendable weapons and the component parts of other weapons that create the effect on a target. Nearly all weapons will require some form of ammunition to operate, the word comes from the French la munition, which refers to the material used for war. The terms ammunition and munitions are used interchangeably, although the term munition now usually refers to both the actual weapons system alongside the ammunition required to operate it. The purpose of ammunition is to project a force against a target to have an effect. The most iconic example of ammunition is the cartridge, which all components required to deliver the weapon effect in a single package. Ammunition comes in a range of sizes and types and is often designed to work only in specific weapons systems. However, there are internationally recognized standards for certain types that enable their use across different weapons. There are also types of ammunition that are designed to have a specialized effect on a target, such as armor-piercing shells and tracer ammunition. Ammunition is commonly colored in a manner to assist in the identification. A round is a cartridge containing a projectile, propellant, primer. A shell is a form of ammunition that is fired by a large cannon or artillery piece. Before the mid-19th century, these shells were made of solid materials. However, since that time, they are often filled with high-explosives. A shot refers to a release of a weapons system. This may involve firing just one round or piece of ammunition, a dud refers to loaded ammunition that fails to function as intended, typically failing to detonate on landing. However, it can refer to ammunition that fails to fire inside the weapon, known as a misfire, or when the ammunition only partially functions. Dud ammunition, which is classified as an ordnance, is regarded as highly dangerous
Ammunition
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A belt of
0.50 caliber ammunition loaded to an
M2 Browning. Every fifth round with a red tip is an M20 (armour piercing incendiary tracer).
Ammunition
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Box of ammunition from first half of the 20th century. From the
Museo del Objeto del Objeto collection
Ammunition
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Cannonballs from the
American Civil War
Ammunition
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Female ordnance workers inspecting cartridge cases in
Los Angeles, 1943
