Clockwork
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Clockwork refers to the inner workings of either mechanical devices called clocks and watches or other mechanisms that work similarly, using a series of gears driven by a spring or weight.
Clockwork of mechanical Prim wrist watch
Keys of various sizes for winding up mainsprings on clocks
Mechanism of a Wall Clock, Ansonia Co. 1904
Movement of a grandfather clock with striking mechanism
Clock
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A clock or chronometer is a device that measures and displays time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month, and the year. Devices operating on several physical processes have been used over the millennia.
An analog pendulum clock made around 18th century
Casio F-91W digital watch, one of the most popular watches ever
Simple horizontal sundial
The flow of sand in an hourglass can be used to keep track of elapsed time.