Woodcut is a relief printing technique in printmaking. An artist carves an image into the surface of a block of wood—typically with gouges—leaving the printing parts level with the surface while removing the non-printing parts. Areas that the artist cuts away carry no ink, while characters or images at surface level carry the ink to produce the print; the block is cut along the wood grain. The surface is covered with ink by rolling over the surface with an ink-covered roller, leaving ink upon the flat surface but not in the non-printing areas. Multiple colors can be printed by keying the paper to a frame around the woodblocks; the art of carving the woodcut can be called "xylography", but this is used in English for images alone, although that and "xylographic" are used in connection with block books, which are small books containing text and images in the same block. They became popular in Europe during the latter half of the 15th century. A single-sheet woodcut is a woodcut presented as a single image or print, as opposed to a book illustration.
Since it's origins in China, the practice of woodcut has spread across the world from Europe, to other parts of Asia, to Latin America. In both Europe and the Far East, traditionally the artist only designed the woodcut, the block-carving was left to specialist craftsmen, called block-cutters, or Formschneider in Germany, some of whom became well-known in their own right. Among these, the best-known are the 16th-century Hieronymus Andreae, Hans Lützelburger and Jost de Negker, all of whom ran workshops and operated as printers and publishers; the formschneider in turn handed the block on to specialist printers. There were further specialists; this is why woodcuts are sometimes described by museums or books as "designed by" rather than "by" an artist. The division of labour had the advantage that a trained artist could adapt to the medium easily, without needing to learn the use of woodworking tools. There were various methods of transferring the artist's drawn design onto the block for the cutter to follow.
Either the drawing would be made directly onto the block, or a drawing on paper was glued to the block. Either way, the artist's drawing was destroyed during the cutting process. Other methods were used, including tracing. In both Europe and the Far East in the early 20th century, some artists began to do the whole process themselves. In Japan, this movement was called sōsaku-hanga, as opposed to shin-hanga, a movement that retained traditional methods. In the West, many artists used the easier technique of linocut instead. Compared to intaglio techniques like etching and engraving, only low pressure is required to print; as a relief method, it is only necessary to ink the block and bring it into firm and contact with the paper or cloth to achieve an acceptable print. In Europe, a variety of woods including boxwood and several nut and fruit woods like pear or cherry were used. There are three methods of printing to consider: Stamping: Used for many fabrics and most early European woodcuts; these were printed by putting the paper/fabric on a table or other flat surface with the block on top, pressing or hammering the back of the block.
Rubbing: Apparently the most common method for Far Eastern printing on paper at all times. Used for European woodcuts and block-books in the fifteenth century, widely for cloth. Used for many Western woodcuts from about 1910 to the present; the block goes face up with the paper or fabric on top. The back is rubbed with a "hard pad, a flat piece of wood, a burnisher, or a leather frotton". A traditional Japanese tool used for this is called a baren. In Japan, complex wooden mechanisms were used to help hold the woodblock still and to apply proper pressure in the printing process; this was helpful once multiple colors were introduced and had to be applied with precision atop previous ink layers. Printing in a press: presses only seem to have been used in Asia in recent times. Printing-presses were used from about 1480 for European prints and block-books, before that for woodcut book illustrations. Simple weighted presses may have been used in Europe before the print-press, but firm evidence is lacking.
A deceased Abbess of Mechelen in 1465 had "unum instrumentum ad imprintendum scripturas et ymagines... cum 14 aliis lapideis printis"—"an instrument for printing texts and pictures... with 14 stones for printing". This is too early to be a Gutenberg-type printing press in that location. Main articles Old master print for Europe, Woodblock printing in Japan for Japan, Lubok for Russia Woodcut originated in China in antiquity as a method of printing on textiles and on paper; the earliest woodblock printed fragments to survive are from China, from the Han dynasty, are of silk printed with flowers in three colours. "In the 13th century the Chinese technique of blockprinting was transmitted to Europe." Paper arrived in Europe from China via al-Andalus later, was being manufactured in Italy by the end of the thirteenth century, in Burgundy and Germany by the end of the fourteenth. In Europe, woodcut is the oldest technique used for old master prints, developing about 1400, by using, on paper, existing techniques for printing.
One of the more ancient woodcuts on paper that can be seen today is The Fire Madonna, in the Cat
In monotheistic thought, God is conceived of as the supreme being, creator deity, principal object of faith. The conceptions of God, as described by theologians include the attributes of omniscience, omnipresence, as having an eternal and necessary existence. Depending on one's kind of theism, these attributes are used either in way of analogy, or in a literal sense as distinct properties. God is most held to be incorporeal. Incorporeality and corporeality of God are related to conceptions of transcendence and immanence of God, with positions of synthesis such as the "immanent transcendence". Psychoanalyst Carl Jung equated religious ideas of God with transcendental aspects of consciousness in his interpretation; some religions describe God without reference to gender, while others or their translations use sex-specific terminology. Judaism attributes only a grammatical gender to God, using terms such as "Him" or "Father" for convenience. God has been conceived as either impersonal. In theism, God is the creator and sustainer of the universe, while in deism, God is the creator, but not the sustainer, of the universe.
In pantheism, God is the universe itself. In atheism, there is an absence of belief in God. In agnosticism, the existence of God is deemed unknowable. God has been conceived as the source of all moral obligation, the "greatest conceivable existent". Many notable philosophers have developed arguments against the existence of God. Monotheists refer to their gods using names prescribed by their respective religions, with some of these names referring to certain cultural ideas about their god's identity and attributes. In the ancient Egyptian era of Atenism the earliest recorded monotheistic religion, this deity was called Aten, premised on being the one "true" Supreme Being and creator of the universe. In the Hebrew Bible and Judaism, Adonai, YHWH and other names are used as the names of God. Yahweh and Jehovah, possible vocalizations of YHWH, are used in Christianity. In the Christian doctrine of the Trinity, coexisting in three "persons", is called the Father, the Son, the Holy Spirit. In Islam, the name Allah is used, while Muslims have a multitude of titular names for God.
In Hinduism, Brahman is considered a monistic concept of God. In Chinese religion, Shangdi is conceived as the progenitor of the universe, intrinsic to it and bringing order to it. Other religions have names for the concept, for instance, Baha in the Bahá'í Faith, Waheguru in Sikhism, Sang Hyang Widhi Wasa in Balinese Hinduism, Ahura Mazda in Zoroastrianism; the many different conceptions of God, competing claims as to God's characteristics and actions, have led to the development of ideas of omnitheism, pandeism, or a perennial philosophy, which postulates that there is one underlying theological truth, of which all religions express a partial understanding, as to which "the devout in the various great world religions are in fact worshipping that one God, but through different, overlapping concepts". The earliest written form of the Germanic word God comes from the 6th-century Christian Codex Argenteus; the English word itself is derived from the Proto-Germanic * ǥuđan. The reconstructed Proto-Indo-European form * ǵhu-tó-m was based on the root * ǵhau-, which meant either "to call" or "to invoke".
The Germanic words for God were neuter—applying to both genders—but during the process of the Christianization of the Germanic peoples from their indigenous Germanic paganism, the words became a masculine syntactic form. In the English language, capitalization is used for names by which a god is known, including'God'; the capitalized form of god is not used for multiple gods or when used to refer to the generic idea of a deity. The English word God and its counterparts in other languages are used for any and all conceptions and, in spite of significant differences between religions, the term remains an English translation common to all; the same holds for Hebrew El, but in Judaism, God is given a proper name, the tetragrammaton YHWH, in origin the name of an Edomite or Midianite deity, Yahweh. In many translations of the Bible, when the word LORD is in all capitals, it signifies that the word represents the tetragrammaton. Allāh is the Arabic term with no plural used by Muslims and Arabic speaking Christians and Jews meaning "The God", while "ʾilāh" is the term used for a deity or a god in general.
God may be given a proper name in monotheistic currents of Hinduism which emphasize the personal nature of God, with early references to his name as Krishna-Vasudeva in Bhagavata or Vishnu and Hari. Ahura Mazda is the name for God used in Zoroastrianism. "Mazda", or rather the Avestan stem-form Mazdā-, nominative Mazdå, reflects Proto-Iranian *Mazdāh. It is taken to be the proper name of the spirit, like its Sanskrit cognate medhā, means "intelligence" or "wisdom". Both the Avestan and Sanskrit words reflect Proto-Indo-Iranian *mazdhā-, from Proto-Indo-European mn̩sdʰeh1 meaning "placing one's mind", hence "wise". Waheguru is a term most used in Sikhism to refer to God, it means "Wonderful Teacher" in the Punjabi language. Vāhi means "wonderful" and guru is a term denoting "teacher". Waheguru is described by some as an experience of ecstasy, beyond all descriptions; the most common usage of the word "Waheguru" is in the greeting Sikhs use with each other: Baha, the "greates
A watch is a timepiece intended to be carried or worn by a person. It is designed to keep working despite the motions caused by the person's activities. A wristwatch is designed to be worn around the wrist, attached by a watch strap or other type of bracelet. A pocket watch is designed for a person to carry in a pocket; the study of timekeeping is known as horology. Watches progressed in the 17th century from spring-powered clocks, which appeared as early as the 14th century. During most of its history the watch was a mechanical device, driven by clockwork, powered by winding a mainspring, keeping time with an oscillating balance wheel; these are called mechanical watches. In the 1960s the electronic quartz watch was invented, powered by a battery and kept time with a vibrating quartz crystal. By the 1980s the quartz watch had taken over most of the market from the mechanical watch; this is called the quartz revolution. Developments in the 2010s include smartwatches, which are elaborate computer-like electronic devices designed to be worn on a wrist.
They incorporate timekeeping functions, but these are only a small subset of the smartwatch's facilities. In general, modern watches display the day, date and year. For mechanical watches, various extra features called "complications", such as moon-phase displays and the different types of tourbillon, are sometimes included. Most electronic quartz watches, on the other hand, include time-related features such as timers and alarm functions. Furthermore, some modern smartwatches incorporate calculators, GPS and Bluetooth technology or have heart-rate monitoring capabilities, some of them use radio clock technology to correct the time. Today, most watches in the market that are inexpensive and medium-priced, used for timekeeping, have quartz movements. However, expensive collectible watches, valued more for their elaborate craftsmanship, aesthetic appeal and glamorous design than for simple timekeeping have traditional mechanical movements though they are less accurate and more expensive than electronic ones.
As of 2018, the most expensive watch sold at auction is the Patek Philippe Henry Graves Supercomplication, the world's most complicated mechanical watch until 1989, fetching 24 million US dollars in Geneva on November 11, 2014. Watches evolved from portable spring-driven clocks. Watches were not worn in pockets until the 17th century. One account says that the word "watch" came from the Old English word woecce which meant "watchman", because it was used by town watchmen to keep track of their shifts at work. Another says that the term came from 17th century sailors, who used the new mechanisms to time the length of their shipboard watches. A great leap forward in accuracy occurred in 1657 with the addition of the balance spring to the balance wheel, an invention disputed both at the time and since between Robert Hooke and Christiaan Huygens; this innovation increased watches' accuracy enormously, reducing error from several hours per day to 10 minutes per day, resulting in the addition of the minute hand to the face from around 1680 in Britain and 1700 in France.
The increased accuracy of the balance wheel focused attention on errors caused by other parts of the movement, igniting a two-century wave of watchmaking innovation. The first thing to be improved was the escapement; the verge escapement was replaced in quality watches by the cylinder escapement, invented by Thomas Tompion in 1695 and further developed by George Graham in the 1720s. Improvements in manufacturing such as the tooth-cutting machine devised by Robert Hooke allowed some increase in the volume of watch production, although finishing and assembling was still done by hand until well into the 19th century. A major cause of error in balance wheel timepieces, caused by changes in elasticity of the balance spring from temperature changes, was solved by the bimetallic temperature compensated balance wheel invented in 1765 by Pierre Le Roy and improved by Thomas Earnshaw; the lever escapement was the single most important technological breakthrough, was invented by Thomas Mudge in 1759 and improved by Josiah Emery in 1785, although it only came into use from about 1800 onwards, chiefly in Britain.
The British had predominated in watch manufacture for much of the 17th and 18th centuries, but maintained a system of production, geared towards high-quality products for the elite. Although there was an attempt to modernise clock manufacture with mass production techniques and the application of duplicating tools and machinery by the British Watch Company in 1843, it was in the United States that this system took off. Aaron Lufkin Dennison started a factory in 1851 in Massachusetts that used interchangeable parts, by 1861 it was running a successful enterprise incorporated as the Waltham Watch Company; the concept of the wristwatch goes back to the production of the earliest watches in the 16th century. Elizabeth I of England received a wristwatch from Robert Dudley in 1571, described as an armed watch; the oldest surviving wristwatch is one given to Joséphine de Beauharnais. From the beginning, wristwatches were exclusively worn by women, while men used pocket watches up until the early 20th century.
Wristwatches were first worn by military men towards the end of the 19th century, when the importance of synchronizing maneuvers during war, without revealing the plan to the enemy through signaling, was recognized. The Garstin Company of London patented a "Watch Wristlet" design in 1893, but they were producing similar designs from the 1880s
The Germanic peoples are an Indo-European ethnolinguistic group of Northern European origin identified by their use of the Germanic languages. Their history stretches from the 2nd millennium BCE up to the present day. Proto-Germanic peoples are believed to have emerged during the Nordic Bronze Age, which developed out of the Battle Axe culture in southern Scandinavia. During the Iron Age various Germanic tribes began a southward expansion at the expense of Celtic peoples, which led to centuries of sporadic violent conflict with ancient Rome, it is from Roman authors. The decisive victory of Arminius at the Battle of the Teutoburg Forest in 9 CE is believed to have prevented the eventual Romanization of the Germanic peoples, has therefore been considered a turning point in world history. Germanic tribes settled the entire Roman frontier along the Rhine and the Danube, some established close relations with the Romans serving as royal tutors and mercenaries, sometimes rising to the highest offices in the Roman military.
Meanwhile, Germanic tribes expanded into Eastern Europe, where the Goths subdued the local Iranian nomads and came to dominate the Pontic Steppe launching sea expeditions into the Balkans and Anatolia as far as Cyprus. The westward expansion of the Huns into Europe in the late 4th century CE pushed many Germanic tribes into the Western Roman Empire, their vacated lands were filled by Slavs. Much of these territories were reclaimed in following centuries. Other tribes became known as the Anglo-Saxons. With the collapse of the Western Roman Empire, a series of Germanic kingdoms emerged, of which, Francia gained a dominant position; this kingdom formed the Holy Roman Empire under the leadership of Charlemagne, recognized by Pope Leo III in 800 CE. Meanwhile, North Germanic seafarers referred to as Vikings, embarked on a massive expansion which led to the establishment of the Duchy of Normandy, Kievan Rus' and their settlement of the British Isles and the North Atlantic Ocean as far as North America.
With the North Germanic abandonment of their native religion in the 11th century, nearly all Germanic peoples had been converted to Christianity. In about 222 BCE, the first use of the Latin term "Germani" appears in the Fasti Capitolini inscription de Galleis Insvbribvs et Germ; this may be referring to Gaul or related people. The term Germani shows up again written by Poseidonios, but is a quotation inserted by the author Athenaios who wrote much later. Somewhat the first surviving detailed discussions of Germani and Germania are those of Julius Caesar, whose memoirs are based on first-hand experience. From Caesar's perspective, Germania was a geographical area of land on the east bank of the Rhine opposite Gaul, which Caesar left outside direct Roman control; this word provides the etymological origin of the modern concept of "Germanic" languages and Germany as a geographical abstraction. For some classical authors Germania included regions of Sarmatia, as well as an area under Roman control on the west bank of the Rhine.
Additionally, in the south there were Celtic peoples still living east of the Rhine and north of the Alps. Caesar and others noted differences of culture which could be found on the east of the Rhine, but the theme of all these cultural references was that this was a wild and dangerous region, less civilized than Gaul, a place that required additional military vigilance. Caesar used the term Germani for a specific tribal grouping in northeastern Belgic Gaul, west of the Rhine, the largest part of whom were the Eburones, he made clear. These are the so-called Germani Cisrhenani, whom Caesar believed to be related to the peoples east of the Rhine, descended from immigrants into Gaul. Tacitus suggests that this was the original meaning of the word "Germani" – as the name of a single tribal nation west of the Rhine, ancestral to the Tungri, not the name of a whole race as it came to mean, he suggested that two large Belgic tribes neighbouring Caesar's Germani, the Nervii and the Treveri, liked to call themselves Germanic in his time, in order not to be associated with Gaulish indolence.
Caesar described this group of tribes both as Germani. Gauls are associated with Celtic languages, the term Germani is associated with Germanic languages, but Caesar did not discuss languages in detail; the geographer Ptolemy described the place where these people lived as Germania, which according to his accounts was bordered by the Rhine and Danube Rivers, but he circumscribed into Greater Germania an area which included Jutland and an enormous island known as Scandia. While saying that the Germani had ancestry across the Rhine, Caesar did not describe these tribes as recent immigrants, saying that they had defended themselves some generations earlier from the invading Cimbri and Teutones, it has been claimed, for example by Maurits Gysseling, that the place names of this region show evidence of an early presence of Germanic languages, as early as the 2nd century BCE. The Celtic culture and language were however influential als
A vise or vice is a mechanical apparatus used to secure an object to allow work to be performed on it. Vises have two parallel jaws, one fixed and the other movable, threaded in and out by a screw and lever. Woodworking vises are attached to a workbench flush with its work surface, their jaws are made of wood or metal, the latter faced with wood, called cheeks, to avoid marring the work. The movable jaw may include a retractable 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 buttress. Traditional workbench vises are 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. One common variety of face vise is the leg vise, which has a long extension down to the floor, with a provision to adjust the spacing of the bottom of the leg, to keep the clamping surfaces of the jaws parallel though the work to be clamped may be of various thicknesses.
An engineer's vise known as a metalworking vise or machinist's vise, is used to clamp metal instead of wood. It is used to hold metal when cutting, it is sometimes made of cast steel or malleable cast iron. However, most heavy duty vises are 65,000 psi ductile iron; some vises have a cast iron body but a steel channel bar. Cast iron is popular because it is 30,000 psi grey iron, rigid and inexpensive; the jaws are separate and replaceable engraved with serrated or diamond teeth. Soft jaw covers made of aluminum, wood or plastic may be used to protect delicate work; the jaw opening of an engineer's vise is always the same size as the jaw width, if not bigger. An engineer's vise is bolted onto the top surface of a workbench, with the face of the fixed jaws just forward of its front edge; the vise may include other features such as a small anvil on the back of its body. Most engineer's vises have a swivel base; some engineer's vises marketed as "Homeowner Grade" are not made of steel or cast iron, but of pot metal or a low grade of iron with a tensile strength of under 10 ksi.
Most homeowner's bench vises have an exposed screw. Machine vises are mounted on grinding machines and milling machines. Abrasive chop saws have a special type of machine vise built into the saw; some hobbyists use a machine vise as a bench vise because of small size. A vacuum vise is a hobbyist's tool used to hold circuit boards, model airplanes and other small work, they are mounted with a suction cup and have an articulated joint in the middle to allow the vise to pivot and swivel. Jewelers use vacuum vises to hold jewelry. Pipe vises are a plumber's tool used to hold pipes in place for threading and cutting. There are two main styles: yoke; the yoke type vise uses a screw to clamp down the pipe, the chain style uses a chain for securing the pipe. Clamp-on vises are very light-duty bench vises, they have smooth jaws for wood and light metalworking, but some have serrated jaws for getting a better grip on metal. Some unique vises combine these features in a rotating design, they help to secure an object while working on the object.
Vises that combine the functions of a pipe vise with a metalworker's vise do exist, are quite common. Some vises have a rotating design to provide both pipe jaws; these are used by plumbers. Other kinds of vise include: Hand vises Compound slide vises are more complex machine vises, they allow precision in the placement of the work. Cross vises, which can be adjusted using leadscrews in the Y axes. Compare router table. Off-center vises Angle vises Sine vises, which use gauge blocks to set up a accurate angle Rotary vises Suction vices Diemakers' vise Saw vices – used for sharpening hand saws Pin vises Jewellers' vises and by contrast Fly tying vise, used to secure fishing hook in fly tying Leg vises, which are attached to a bench but supported from the ground so as to be stable under the heavy use imposed by a blacksmith's work Trailer hitch vice Shaker broom vise Rigging vise, otherwise known as a triangle vise or splicing vise, which has three jaws. Used to close thimbles and splice rope and wire rope.
A vise is sometimes misused as a makeshift press. Sometimes people will hit it with a hammer; this will void the warranty of the vise and destroy it and is covered in the instruction manuals for vises. Another way to misuse a vise is by pulling back too against the movable face. Parallels Vise grip
A lathe is a machine that rotates a workpiece about an axis of rotation to perform various operations such as cutting, knurling, deformation and turning, with tools that are applied to the workpiece to create an object with symmetry about that axis. Lathes are used in woodturning, metal spinning, thermal spraying, parts reclamation, glass-working. Lathes can be used to shape the best-known design being the Potter's wheel. Most suitably equipped metalworking lathes can be used to produce most solids of revolution, plane surfaces and screw threads or helices. Ornamental lathes can produce three-dimensional solids of incredible complexity; the workpiece is held in place by either one or two centers, at least one of which can be moved horizontally to accommodate varying workpiece lengths. Other work-holding methods include clamping the work about the axis of rotation using a chuck or collet, or to a faceplate, using clamps or dogs. Examples of objects that can be produced on a lathe include screws, gun barrels, cue sticks, table legs, baseball bats, musical instruments and much more.
The lathe is an ancient tool, with tenuous evidence for its existence at a Mycenaean Greek site, dating back as far as the 13th or 14th century BC. Clear evidence of turned artifacts have been found from the 6th century BC: fragments of a wooden bowl in an Etruscan tomb in Northern Italy as well as two flat wooden dishes with decorative turned rims from modern Turkey. During the Warring States period in China, ca 400 BCE, the ancient Chinese used rotary lathes to sharpen tools and weapons on an industrial scale; the first known painting showing a lathe dates to the 3rd century BC in ancient Egypt. The lathe was important to the Industrial Revolution, it is known as the mother of machine tools, as it was the first machine tool that led to the invention of other machine tools. The first documented, all-metal slide rest lathe was invented by Jacques de Vaucanson around 1751, it was described in the Encyclopédie. An important early lathe in the UK was the horizontal boring machine, installed in 1772 in the Royal Arsenal in Woolwich.
It was horse-powered and allowed for the production of much more accurate and stronger cannon used with success in the American Revolutionary War in the late 18th century. One of the key characteristics of this machine was that the workpiece was turning as opposed to the tool, making it technically a lathe. Henry Maudslay who developed many improvements to the lathe worked at the Royal Arsenal from 1783 being exposed to this machine in the Verbruggen workshop. A detailed description of Vaucanson's lathe was published decades before Maudslay perfected his version, it is that Maudslay was not aware of Vaucanson's work, since his first versions of the slide rest had many errors that were not present in the Vaucanson lathe. During the Industrial Revolution, mechanized power generated by water wheels or steam engines was transmitted to the lathe via line shafting, allowing faster and easier work. Metalworking lathes evolved into heavier machines with more rigid parts. Between the late 19th and mid-20th centuries, individual electric motors at each lathe replaced line shafting as the power source.
Beginning in the 1950s, servomechanisms were applied to the control of lathes and other machine tools via numerical control, coupled with computers to yield computerized numerical control. Today manually controlled and CNC lathes coexist in the manufacturing industries. A lathe may or may not have legs known as a nugget, which sit on the floor and elevate the lathe bed to a working height. A lathe may sit on a workbench or table, not requiring a stand. All lathes have a bed, a horizontal beam. Woodturning lathes specialized for turning large bowls have no bed or tail stock a free-standing headstock and a cantilevered tool rest. At one end of the bed is a headstock; the headstock contains high-precision spinning bearings. Rotating within the bearings is a horizontal axle, with an axis parallel to the bed, called the spindle. Spindles are hollow and have exterior threads and/or an interior Morse taper on the "inboard" by which work-holding accessories may be mounted to the spindle. Spindles may have exterior threads and/or an interior taper at their "outboard" end, and/or may have a hand-wheel or other accessory mechanism on their outboard end.
Spindles are impart motion to the workpiece. The spindle is driven either by foot power from a treadle and flywheel or by a belt or gear drive to a power source. In most modern lathes this power source is an integral electric motor either in the headstock, to the left of the headstock, or beneath the headstock, concealed in the stand. In addition to the spindle and its bearings, the headstock contains parts to convert the motor speed into various spindle speeds. Various types of speed-changing mechanism achieve this, from a cone pulley or step pulley, to a cone pulley with back gear, to an entire gear train similar to that of a manual-shift auto transmission; some motors have electronic rheostat-type speed controls, which obviates cone gears. The counterpoint to the headstock is the tailstock, sometimes referred to as the loose head, as it can be positioned at any convenient point on the bed by
Religion is a cultural system of designated behaviors and practices, worldviews, sanctified places, ethics, or organizations, that relates humanity to supernatural, transcendental, or spiritual elements. However, there is no scholarly consensus over what constitutes a religion. Different religions may or may not contain various elements ranging from the divine, sacred things, faith, a supernatural being or supernatural beings or "some sort of ultimacy and transcendence that will provide norms and power for the rest of life". Religious practices may include rituals, commemoration or veneration, festivals, trances, funerary services, matrimonial services, prayer, art, public service, or other aspects of human culture. Religions have sacred histories and narratives, which may be preserved in sacred scriptures, symbols and holy places, that aim to give a meaning to life. Religions may contain symbolic stories, which are sometimes said by followers to be true, that have the side purpose of explaining the origin of life, the universe, other things.
Traditionally, faith, in addition to reason, has been considered a source of religious beliefs. There are an estimated 10,000 distinct religions worldwide, but about 84% of the world's population is affiliated with one of the five largest religion groups, namely Christianity, Hinduism, Buddhism or forms of folk religion; the religiously unaffiliated demographic includes those who do not identify with any particular religion and agnostics. While the religiously unaffiliated have grown globally, many of the religiously unaffiliated still have various religious beliefs; the study of religion encompasses a wide variety of academic disciplines, including theology, comparative religion and social scientific studies. Theories of religion offer various explanations for the origins and workings of religion, including the ontological foundations of religious being and belief. Religion is derived from the ultimate origins of which are obscure. One possible interpretation traced to Cicero, connects lego read, i.e. re with lego in the sense of choose, go over again or consider carefully.
The definition of religio by Cicero is cultum deorum, "the proper performance of rites in veneration of the gods." Julius Caesar used religio to mean "obligation of an oath" when discussing captured soldiers making an oath to their captors. The Roman naturalist Pliny the Elder used the term religio on elephants in that they venerate the sun and the moon. Modern scholars such as Tom Harpur and Joseph Campbell favor the derivation from ligare bind, connect from a prefixed re-ligare, i.e. re + ligare or to reconnect, made prominent by St. Augustine, following the interpretation given by Lactantius in Divinae institutiones, IV, 28; the medieval usage alternates with order in designating bonded communities like those of monastic orders: "we hear of the'religion' of the Golden Fleece, of a knight'of the religion of Avys'". In the ancient and medieval world, the etymological Latin root religio was understood as an individual virtue of worship in mundane contexts. In general, religio referred to broad social obligations towards anything including family, neighbors and towards God.
Religio was most used by the ancient Romans not in the context of a relation towards gods, but as a range of general emotions such as hesitation, anxiety, fear. The term was closely related to other terms like scrupulus which meant "very precisely" and some Roman authors related the term superstitio, which meant too much fear or anxiety or shame, to religio at times; when religio came into English around the 1200s as religion, it took the meaning of "life bound by monastic vows" or monastic orders. The compartmentalized concept of religion, where religious things were separated from worldly things, was not used before the 1500s; the concept of religion was first used in the 1500s to distinguish the domain of the church and the domain of civil authorities. In the ancient Greece, the Greek term threskeia was loosely translated into Latin as religio in late antiquity; the term was sparsely used in classical Greece but became more used in the writings of Josephus in the first century CE. It was used in mundane contexts and could mean multiple things from respectful fear to excessive or harmfully distracting practices of others.
It was contrasted with the Greek word deisidaimonia which meant too much fear. The modern concept of religion, as an abstraction that entails distinct sets of beliefs or doctrines, is a recent invention in the English language; such usage began with texts from the 17th century due to events such the splitting of Christendom during the Protestant Reformation and globalization in the age of exploration, which involved contact with numerous foreign cultures with non-European languages. Some argue that regardless of its definition, it is not appropriate to apply the term religion to non-Western cultures. Others argue that using religion on non-western cultures distorts what people believe; the concept of religion was formed in the 16th and 17th centuries, despite the fact that ancient sacred texts like the Bible, the Quran, others did not have a word or a concept of religion in the original languages and neither did the peopl