1.
Internet Archive
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The Internet Archive is a San Francisco–based nonprofit digital library with the stated mission of universal access to all knowledge. As of October 2016, its collection topped 15 petabytes, in addition to its archiving function, the Archive is an activist organization, advocating for a free and open Internet. Its web archive, the Wayback Machine, contains over 150 billion web captures, the Archive also oversees one of the worlds largest book digitization projects. Founded by Brewster Kahle in May 1996, the Archive is a 501 nonprofit operating in the United States. It has a budget of $10 million, derived from a variety of sources, revenue from its Web crawling services, various partnerships, grants, donations. Its headquarters are in San Francisco, California, where about 30 of its 200 employees work, Most of its staff work in its book-scanning centers. The Archive has data centers in three Californian cities, San Francisco, Redwood City, and Richmond, the Archive is a member of the International Internet Preservation Consortium and was officially designated as a library by the State of California in 2007. Brewster Kahle founded the Archive in 1996 at around the time that he began the for-profit web crawling company Alexa Internet. In October 1996, the Internet Archive had begun to archive and preserve the World Wide Web in large quantities, the archived content wasnt available to the general public until 2001, when it developed the Wayback Machine. In late 1999, the Archive expanded its collections beyond the Web archive, Now the Internet Archive includes texts, audio, moving images, and software. It hosts a number of projects, the NASA Images Archive, the contract crawling service Archive-It. According to its web site, Most societies place importance on preserving artifacts of their culture, without such artifacts, civilization has no memory and no mechanism to learn from its successes and failures. Our culture now produces more and more artifacts in digital form, the Archives mission is to help preserve those artifacts and create an Internet library for researchers, historians, and scholars. In August 2012, the Archive announced that it has added BitTorrent to its file download options for over 1.3 million existing files, on November 6,2013, the Internet Archives headquarters in San Franciscos Richmond District caught fire, destroying equipment and damaging some nearby apartments. The nonprofit Archive sought donations to cover the estimated $600,000 in damage, in November 2016, Kahle announced that the Internet Archive was building the Internet Archive of Canada, a copy of the archive to be based somewhere in the country of Canada. The announcement received widespread coverage due to the implication that the decision to build an archive in a foreign country was because of the upcoming presidency of Donald Trump. Kahle was quoted as saying that on November 9th in America and it was a firm reminder that institutions like ours, built for the long-term, need to design for change. For us, it means keeping our cultural materials safe, private and it means preparing for a Web that may face greater restrictions
2.
E-book
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An electronic book is a book publication made available in digital form, consisting of text, images, or both, readable on the flat-panel display of computers or other electronic devices. Although sometimes defined as a version of a printed book. Commercially produced and sold e-books are usually intended to be read on dedicated e-reader devices, however, almost any sophisticated computer device that features a controllable viewing screen can also be used to read e-books, including desktop computers, laptops, tablets and smartphones. In the 2000s, there was a trend of print and e-book sales moving to the Internet, where readers buy traditional paper books and e-books on websites using e-commerce systems. With e-books, users can browse through online, and then when they select and order titles. At the start of 2012 in the U. S. more e-books were published online than were distributed in hardcover, the main reasons that people are buying e-books online are due to possibly lower prices, increased comfort and a larger selection of titles. With e-books, lectronic bookmarks make referencing easier, and e-book readers may allow the user to annotate pages, although fiction and non-fiction books come in e-book formats, technical material is especially suited for e-book delivery because it can be searched for keywords. In addition, for programming books, code examples can be copied, E-book reading is increasing in the U. S. by 2014, 28% of adults had read an e-book, compared to 23% in 2013. This is increasing, because by 2014 50% of American adults had an e-reader or a tablet, E-books are also referred to as ebooks, eBooks, e-Books, e-journals, e-editions or as digital books. The devices that are designed specifically for reading e-books are called e-readers, the idea of an e-reader that would enable a reader to view books on a screen came to Bob Brown after watching his first talkie. In 1930, he wrote a book on this idea and titled it The Readies, although Brown came up with the idea intellectually in the 1930s, early commercial e-readers did not follow his model. Schuessler relates it to a DJ spinning bits of old songs to create a beat or a new song as opposed to just a remix of a familiar song. The inventor of the first e-book is not widely agreed upon and her idea behind the device was to decrease the number of books that her pupils carried to school. The first e-book may be the Index Thomisticus, a heavily annotated electronic index to the works of Thomas Aquinas, prepared by Roberto Busa beginning in 1949, although originally stored on a single computer, a distributable CD-ROM version appeared in 1989. In 2005, the Index was published online, augment ran on specialized hardware, while FRESS ran on IBM mainframes. All these systems also provided extensive hyperlinking, graphics, and other capabilities, van Dam is generally thought to have coined the term electronic book, and it was established enough to use in an article title by 1985. FRESS was used for reading extensive primary texts online, as well as for annotation and online discussions in several courses, browns faculty made extensive use of FRESS, for example the philosopher Roderick Chisholm used it to produce several of his books. Thus in the Preface to Person and Object he writes The book would not have been completed without the epoch-making File Retrieval, despite the extensive earlier history, several publications report Michael S. Hart as the inventor of the e-book
3.
Image scanner
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Commonly used in offices are variations of the desktop flatbed scanner where the document is placed on a glass window for scanning. Mechanically driven scanners that move the document are typically used for large-format documents, a rotary scanner, used for high-speed document scanning, is a type of drum scanner that uses a CCD array instead of a photomultiplier. Non-contact planetary scanners essentially photograph delicate books and documents, all these scanners produce two-dimensional images of subjects that are usually flat, but sometimes solid, 3D scanners produce information on the three-dimensional structure of solid objects. Digital cameras can be used for the same purposes as dedicated scanners, when compared to a true scanner, a camera image is subject to a degree of distortion, reflections, shadows, low contrast, and blur due to camera shake. Resolution is sufficient for less demanding applications, Digital cameras offer advantages of speed, portability and non-contact digitizing of thick documents without damaging the book spine. As of 2010 scanning technologies were combining 3D scanners with digital cameras to create full-color, in the biomedical research area, detection devices for DNA microarrays are called scanners as well. These scanners are high-resolution systems, similar to microscopes, the detection is done via CCD or a photomultiplier tube. Modern scanners are considered the successors of early telephotography and fax input devices and it used electromagnets to drive and synchronize movement of pendulums at the source and the distant location, to scan and reproduce images. It could transmit handwriting, signatures, or drawings within an area of up to 150 x 100mm, Édouard Belins Belinograph of 1913, scanned using a photocell and transmitted over ordinary phone lines, formed the basis for the AT&T Wirephoto service. In Europe, services similar to a wirephoto were called a Belino and it was used by news agencies from the 1920s to the mid-1990s, and consisted of a rotating drum with a single photodetector at a standard speed of 60 or 120 rpm. They send a linear analog AM signal through standard telephone lines to receptors. Color photos were sent as three separated RGB filtered images consecutively, but only for special events due to transmission costs, Drum scanners capture image information with photomultiplier tubes, rather than the charge-coupled device arrays found in flatbed scanners and inexpensive film scanners. Modern color drum scanners use three matched PMTs, which red, blue, and green light, respectively. Light from the artwork is split into separate red, blue. Photomultipliers offer superior dynamic range and for this reason drum scanners can extract more detail from very dark areas of a transparency than flatbed scanners using CCD sensors. The smaller dynamic range of the CCD sensors, versus photomultiplier tubes, can lead to loss of shadow detail, while mechanics vary by manufacturer, most drum scanners pass light from halogen lamps though a focusing system to illuminate both reflective and transmissive originals. The drum scanner gets its name from the clear acrylic cylinder, depending on size, it is possible to mount originals up to 20x28, but maximum size varies by manufacturer. One of the features of drum scanners is the ability to control sample area
4.
Digital camera
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A digital camera or digicam is a camera that produces digital images that can be stored in a computer, displayed on a screen and printed. Most cameras sold today are digital, and digital cameras are incorporated into many devices ranging from PDAs, Digital and movie cameras share an optical system, typically using a lens with a variable diaphragm to focus light onto an image pickup device. The diaphragm and shutter admit the correct amount of light to the imager, just as with film, however, unlike film cameras, digital cameras can display images on a screen immediately after being recorded, and store and delete images from memory. Many digital cameras can also record moving videos with sound, some digital cameras can crop and stitch pictures and perform other elementary image editing. The history of the camera began with Eugene F. Lally of the Jet Propulsion Laboratory. His 1961 idea was to take pictures of the planets and stars while travelling through space to give information about the astronauts position, unfortunately, as with Texas Instruments employee Willis Adcocks filmless camera in 1972, the technology had yet to catch up with the concept. Steven Sasson as an engineer at Eastman Kodak invented and built the first electronic camera using a charge-coupled device image sensor in 1975, earlier ones used a camera tube, later ones digitized the signal. Early uses were military and scientific, followed by medical. In the mid to late 1990s digital cameras became common among consumers, by the mid-2000s digital cameras had largely replaced film cameras, and higher-end cell phones had an integrated digital camera. By the beginning of the 2010s, almost all smartphones had a digital camera. The two major types of image sensor are CCD and CMOS. A CCD sensor has one amplifier for all the pixels, while each pixel in a CMOS active-pixel sensor has its own amplifier, compared to CCDs, CMOS sensors use less power. Cameras with a small sensor use a back-side-illuminated CMOS sensor, overall final image quality is more dependent on the image processing capability of the camera, than on sensor type. The resolution of a camera is often limited by the image sensor that turns light into that discrete signals. The brighter the image at a point on the sensor. Depending on the structure of the sensor, a color filter array may be used. The number of pixels in the sensor determines the cameras pixel count, in a typical sensor, the pixel count is the product of the number of rows and the number of columns. For example, a 1,000 by 1,000 pixel sensor would have 1,000,000 pixels, final quality of an image depends on all optical transformations in the chain of producing the image
5.
India
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India, officially the Republic of India, is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and it is bounded by the Indian Ocean on the south, the Arabian Sea on the southwest, and the Bay of Bengal on the southeast. It shares land borders with Pakistan to the west, China, Nepal, and Bhutan to the northeast, in the Indian Ocean, India is in the vicinity of Sri Lanka and the Maldives. Indias Andaman and Nicobar Islands share a border with Thailand. The Indian subcontinent was home to the urban Indus Valley Civilisation of the 3rd millennium BCE, in the following millennium, the oldest scriptures associated with Hinduism began to be composed. Social stratification, based on caste, emerged in the first millennium BCE, early political consolidations took place under the Maurya and Gupta empires, the later peninsular Middle Kingdoms influenced cultures as far as southeast Asia. In the medieval era, Judaism, Zoroastrianism, Christianity, and Islam arrived, much of the north fell to the Delhi sultanate, the south was united under the Vijayanagara Empire. The economy expanded in the 17th century in the Mughal empire, in the mid-18th century, the subcontinent came under British East India Company rule, and in the mid-19th under British crown rule. A nationalist movement emerged in the late 19th century, which later, under Mahatma Gandhi, was noted for nonviolent resistance, in 2015, the Indian economy was the worlds seventh largest by nominal GDP and third largest by purchasing power parity. Following market-based economic reforms in 1991, India became one of the major economies and is considered a newly industrialised country. However, it continues to face the challenges of poverty, corruption, malnutrition, a nuclear weapons state and regional power, it has the third largest standing army in the world and ranks sixth in military expenditure among nations. India is a constitutional republic governed under a parliamentary system. It is a pluralistic, multilingual and multi-ethnic society and is home to a diversity of wildlife in a variety of protected habitats. The name India is derived from Indus, which originates from the Old Persian word Hindu, the latter term stems from the Sanskrit word Sindhu, which was the historical local appellation for the Indus River. The ancient Greeks referred to the Indians as Indoi, which translates as The people of the Indus, the geographical term Bharat, which is recognised by the Constitution of India as an official name for the country, is used by many Indian languages in its variations. Scholars believe it to be named after the Vedic tribe of Bharatas in the second millennium B. C. E and it is also traditionally associated with the rule of the legendary emperor Bharata. Gaṇarājya is the Sanskrit/Hindi term for republic dating back to the ancient times, hindustan is a Persian name for India dating back to the 3rd century B. C. E. It was introduced into India by the Mughals and widely used since then and its meaning varied, referring to a region that encompassed northern India and Pakistan or India in its entirety
6.
China
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China, officially the Peoples Republic of China, is a unitary sovereign state in East Asia and the worlds most populous country, with a population of over 1.381 billion. The state is governed by the Communist Party of China and its capital is Beijing, the countrys major urban areas include Shanghai, Guangzhou, Beijing, Chongqing, Shenzhen, Tianjin and Hong Kong. China is a power and a major regional power within Asia. Chinas landscape is vast and diverse, ranging from forest steppes, the Himalaya, Karakoram, Pamir and Tian Shan mountain ranges separate China from much of South and Central Asia. The Yangtze and Yellow Rivers, the third and sixth longest in the world, respectively, Chinas coastline along the Pacific Ocean is 14,500 kilometers long and is bounded by the Bohai, Yellow, East China and South China seas. China emerged as one of the worlds earliest civilizations in the basin of the Yellow River in the North China Plain. For millennia, Chinas political system was based on hereditary monarchies known as dynasties, in 1912, the Republic of China replaced the last dynasty and ruled the Chinese mainland until 1949, when it was defeated by the communist Peoples Liberation Army in the Chinese Civil War. The Communist Party established the Peoples Republic of China in Beijing on 1 October 1949, both the ROC and PRC continue to claim to be the legitimate government of all China, though the latter has more recognition in the world and controls more territory. China had the largest economy in the world for much of the last two years, during which it has seen cycles of prosperity and decline. Since the introduction of reforms in 1978, China has become one of the worlds fastest-growing major economies. As of 2016, it is the worlds second-largest economy by nominal GDP, China is also the worlds largest exporter and second-largest importer of goods. China is a nuclear weapons state and has the worlds largest standing army. The PRC is a member of the United Nations, as it replaced the ROC as a permanent member of the U. N. Security Council in 1971. China is also a member of numerous formal and informal multilateral organizations, including the WTO, APEC, BRICS, the Shanghai Cooperation Organization, the BCIM, the English name China is first attested in Richard Edens 1555 translation of the 1516 journal of the Portuguese explorer Duarte Barbosa. The demonym, that is, the name for the people, Portuguese China is thought to derive from Persian Chīn, and perhaps ultimately from Sanskrit Cīna. Cīna was first used in early Hindu scripture, including the Mahābhārata, there are, however, other suggestions for the derivation of China. The official name of the state is the Peoples Republic of China. The shorter form is China Zhōngguó, from zhōng and guó and it was then applied to the area around Luoyi during the Eastern Zhou and then to Chinas Central Plain before being used as an occasional synonym for the state under the Qing
7.
Copyright
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Copyright is a legal right created by the law of a country that grants the creator of an original work exclusive rights for its use and distribution. This is usually only for a limited time, the exclusive rights are not absolute but limited by limitations and exceptions to copyright law, including fair use. A major limitation on copyright is that copyright protects only the expression of ideas. Copyright is a form of property, applicable to certain forms of creative work. Some, but not all jurisdictions require fixing copyrighted works in a tangible form and it is often shared among multiple authors, each of whom holds a set of rights to use or license the work, and who are commonly referred to as rights holders. These rights frequently include reproduction, control over derivative works, distribution, public performance, copyrights are considered territorial rights, which means that they do not extend beyond the territory of a specific jurisdiction. While many aspects of copyright laws have been standardized through international copyright agreements. Typically, the duration of a copyright spans the authors life plus 50 to 100 years, some countries require certain copyright formalities to establishing copyright, but most recognize copyright in any completed work, without formal registration. Generally, copyright is enforced as a matter, though some jurisdictions do apply criminal sanctions. Most jurisdictions recognize copyright limitations, allowing fair exceptions to the exclusivity of copyright. Copyright came about with the invention of the press and with wider literacy. As a legal concept, its origins in Britain were from a reaction to printers monopolies at the beginning of the 18th century, Copyright laws allow products of creative human activities, such as literary and artistic production, to be preferentially exploited and thus incentivized. Different cultural attitudes, social organizations, economic models and legal frameworks are seen to account for why copyright emerged in Europe and not, for example, however, with copyright laws, intellectual production comes to be seen as a product of an individual, with attendant rights. The most significant point is that patent and copyright laws support the expansion of the range of human activities that can be commodified. This parallels the ways in which led to the commodification of many aspects of social life that earlier had no monetary or economic value per se. Often seen as the first real copyright law, the 1709 British Statute of Anne gave the rights for a fixed period. The act also alluded to individual rights of the artist and it began, Whereas Printers, Booksellers, and other Persons, have of late frequently taken the Liberty of Printing. Books, and other Writings, without the Consent of the Authors. to their very great Detriment, and too often to the Ruin of them and their Families
8.
Paper cutter
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A paper cutter is a tool often found in offices and classrooms, designed to cut a large set of paper at once with a straight edge. Paper cutters, similar to those of today, were patented in 1844 and 1852 by Guillaume Massiquot and they have been around since the late 1830s, when, in 1837, Thirault built a model with a fixed blade to a flat surface. Since the middle of the 19th century considerable improvements have made by Fomm and Krause of Germany, Furnival in England. Paper cutters vary in size, usually from about 30 centimetres in length on each side for work to 841 millimetres in design workshops. The surface will usually have a grid either painted or inscribed on it, often in half-inch increments, at the very least, it must have a flat edge against which the user may line up the paper at right-angles before passing it under the blade. It is usually heavy, so that it will remain steady while in use. On the right-hand edge is a long, curved blade, often referred to as a knife. Larger versions have a compression coil spring as part of the attachment mechanism that pulls the knife against the stationary edge as the knife is drawn down to cut the paper. The other end of the unit is a handle. The stationary right edge of the base is also steel, with an exposed, when the knife is pulled down to cut paper, the action resembles that of a pair of scissors, only instead of two knives moving against each other, one is stationary. The combination of a blade mounted to a base produces clean and straight cuts. Paper cutters are used for cutting thin sheet metal, cardboard. The blade on a cutter is made of steel which makes it almost impossible to break. A variant design uses a blade mounted on a sliding shuttle attached to a rail. This type of paper cutter is known as a paper cutter. Advantages of this design include being able to make cuts, perforations or just score the paper without cutting. It is also almost impossible for the user to cut him/herself and this makes it safer for home use. Higher-end versions of rotary paper cutters are used for paper cutting and are popular for cutting down photographs
9.
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
10.
First Amendment to the United States Constitution
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It was adopted on December 15,1791, as one of the ten amendments that constitute the Bill of Rights. The Bill of Rights was originally proposed to assuage Anti-Federalist opposition to Constitutional ratification, initially, the First Amendment applied only to laws enacted by the Congress, and many of its provisions were interpreted more narrowly than they are today. Beginning with Gitlow v. New York, the Supreme Court applied the First Amendment to states—a process known as incorporation—through the Due Process Clause of the Fourteenth Amendment. The Supreme Court overturned English common law precedent to increase the burden of proof for defamation and libel suits, commercial speech, however, is less protected by the First Amendment than political speech, and is therefore subject to greater regulation. The Free Press Clause protects publication of information and opinions, in Near v. Minnesota and New York Times v. United States, the Supreme Court ruled that the First Amendment protected against prior restraint—pre-publication censorship—in almost all cases. The Petition Clause protects the right to all branches and agencies of government for action. In addition to the right of assembly guaranteed by this clause, eight of the other thirteen states made similar pledges. However, these declarations were generally considered mere admonitions to state legislatures, after a brief debate, Masons proposal was defeated by a unanimous vote of the state delegations. For the constitution to be ratified, however, nine of the thirteen states were required to approve it in state conventions, opposition to ratification was partly based on the Constitutions lack of adequate guarantees for civil liberties. Constitution was eventually ratified by all thirteen states and this language was greatly condensed by Congress, and passed the House and Senate with almost no recorded debate, complicating future discussion of the Amendments intent. The First Amendment, along with the rest of the Bill of Rights, was submitted to the states for ratification on September 25,1789, and adopted on December 15,1791. In Reynolds v. United States the Supreme Court used these words to declare that it may be accepted almost as a declaration of the scope. Congress was deprived of all power over mere opinion, but was left free to reach actions which were in violation of social duties or subversive of good order. In these two sentences is found the distinction between what properly belongs to the church and what to the State. Originally, the First Amendment applied only to the federal government, Massachusetts, for example, was officially Congregationalist until the 1830s. Neither can pass laws which aid one religion, aid all religions, in the words of Jefferson, the clause against establishment of religion by law was intended to erect a wall of separation between church and State. That wall must be high and impregnable. We could not approve the slightest breach, in Torcaso v. Watkins, the Supreme Court ruled that the Constitution prohibits states and the federal government from requiring any kind of religious test for public office
11.
Book
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A book is a set of written, printed, illustrated, or blank sheets, made of paper, parchment, or other materials, fastened together to hinge at one side, with text and/or images printed in ink. A single sheet within a book is a leaf, and each side of a leaf is a page, a set of text-filled or illustrated pages produced in electronic format for reading on a computer screen, smartphone or e-reader device is known as an electronic book, or e-book. The term books may refer the body of works of literature. In library and information science, a book is called a monograph, to distinguish it from serial periodicals such as magazines, journals, in novels and sometimes other types of books, a book may be divided into several large sections, also called books. An avid reader or collector of books or a lover is a bibliophile or colloquially. A shop where books are bought and sold is a bookshop or bookstore, Books are also sold in some department stores, drugstores and newspaper vendors. Books can also be borrowed from libraries, google has estimated that as of 2010, approximately 130,000,000 distinct titles had been published. In some wealthier nations, printed books are giving way to the usage of electronic or e-books, the word book comes from Old English bōc, which in turn comes from the Germanic root *bōk-, cognate to beech. Similarly, in Slavic languages буква is cognate with beech, in Russian and in Serbian and Macedonian, the word букварь or буквар refers specifically to a primary school textbook that helps young children master the techniques of reading and writing. It is thus conjectured that the earliest Indo-European writings may have been carved on beech wood, similarly, the Latin word codex, meaning a book in the modern sense, originally meant block of wood. When writing systems were created in ancient civilizations, a variety of objects, such as stone, clay, tree bark, metal sheets, the study of such inscriptions forms a major part of history. The study of inscriptions is known as epigraphy, the Ancient Egyptians would often write on papyrus, a plant grown along the Nile River. At first the words were not separated from other and there was no punctuation. Texts were written right to left, left to right. The technical term for that last type of writing is boustrophedon, a tablet might be defined as a physically robust writing medium, suitable for casual transport and writing. See also stylus, the instrument used to write on a tablet, clay tablets were flattened and mostly dry pieces of clay that could be easily carried, and impressed with a stylus. They were used as a medium, especially for writing in cuneiform, throughout the Bronze Age. Tablets were used by traders to record sales of such as bushels of grain
12.
Vise
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A vise or vice is a mechanical apparatus used to secure an object to allow work to be performed on it. Vises have two jaws, one fixed and the other movable, threaded in and out by a screw. Woodworking vises are attached to a workbench, typically flush with its work surface and their jaws are made of wood or metal, the latter usually faced with wood, called cheeks, to avoid marring the work. The movable jaw may include a dog to hold work against a bench dog. Quick-release vises employ a split nut that allows the screw to engage or disengage with a half-turn of the handle, when disengaged the movable jaw may be moved in or out throughout its entire range of motion, vastly speeding up the process of adjustment. Common thread types are Acme and buttress, traditional workbench vises are commonly either face vises, attached to the front of the workbench, near the left end or end vises, attached to or forming part of the right end of the bench. An engineers vise, also known as a metalworking vise or machinists vise, is used to clamp metal instead of wood and it is used to hold metal when filing or cutting. It is sometimes made of cast steel or malleable cast iron, however, most heavy duty vises are 55,000 psi cast steel or 65,000 psi ductile iron. Some vises have a cast iron body but a steel channel bar, cast iron is popular because it is typically 30 ksi grey iron which is rigid, strong and inexpensive. The jaws are separate and replaceable, usually engraved with serrated or diamond teeth. Soft jaw covers made of aluminum, copper, wood or plastic may be used to protect delicate work, the jaw opening of an engineers vise is almost always the same size as the jaw width, if not bigger. An engineers vise is bolted onto the top surface of a workbench, the vise may include other features such as a small anvil on the back of its body. Most engineers vises have a swivel base, some engineers vises marketed as Homeowner Grade are not made of steel or cast iron, but of pot metal or a very low grade of iron, typically with a tensile strength of under 10 ksi. Most homeowners bench vises have an exposed screw, machine vises are mounted on drill presses, grinding machines and milling machines. Abrasive chop saws have a type of machine vise built into the saw. Some hobbyists use a machine vise as a bench vise because of the low cost, a vacuum vise is a hobbyists tool, commonly used to hold circuit boards, model airplanes and other small work. They are mounted with a cup and often have an articulated joint in the middle to allow the vise to pivot. Jewelers also use vacuum vises to hold jewelry, pipe vises are a plumbers tool, often used to hold pipes in place for threading and cutting
