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Often power for the device is stored within it via a winding device that applies mechanical stress to an energy-storage mechanism such as a spring, thus involving some form of escapement; in other cases, hand power may be utilized as it is applied. The use of wheels, whether linked by friction or gear teeth, to redirect motion or gain speed or torque, is typical; many clockworks have been constructed primarily to serve as visible or implicit tours de force of mechanical ingenuity in this area.

The most common examples are mechanical clocks - hence the name. Others include:

• Toys - often as a simple mechanical motor, or to create automata.
• Babbage's difference and analytical engines, and simpler mechanical calculators.
• Astronomical models, such as orrerys whose history spans hundreds of years.
• Music boxes, which were very popular during the 19th century and at the beginning of the 20th.
• Almost all phonographThe phonograph or gramophone was the most common device for playing recorded sound from the 1870s through the 1980s. Usage of these terms is somewhat different in British English and American English; see usage note below. In more modern usage, this devics built before the 1930sCenturies: 19th century 20th century 21st century Decades: 1880s 1890s 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s Years: 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 Events and trends Technology Jet engine invented Link Trainer invented Sc.
• Low-powered electrical equipment, such as a radioFor other uses see: radio (disambiguation Radio is a technology that allows the transmission of signals by modulation of electromagnetic waves with frequencies below those of light. Radio waves Radio waves are a form of electromagnetic radiation, and are, where an energy-storing spring accounting for much of the size and weight of the device spins a much smaller electric generatorA generator refers to several things: an electrical generator the generating set of a group In computer science, particularly in the Python programming language, a generator is a type of continuation that can be used as an iterator.; such equipment is very popular in certain Third World situations where batteriesIn science and technology, a battery is a device that stores energy and makes it available in an electrical form. Although such storage in an electrostatic form is practical in some specialized uses, batteries usually consist of electrochemical devices su and mains power (house current) may be scarce.

See also

• Antikythera mechanismThe Antikythera mechanism is an ancient artifact believed to be an early clockwork mechanism. It was discovered in a shipwreck off the Greek island of Antikythera, between Kythera and Crete, and has been dated to about 87 BC. The wreck was discovered in 1
• wind-upWind-up has two distinct meanings: as an adjective, referring to mechanisms, such as clocks, music boxes and clockwork toys, which have a spring that needs to be wound up to store power for operation; and as a noun, referring to the torsion that exists in

Clockwork is also the name of a one-man band. See this external link