Clockwork
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Clockwork is the inner workings of either clocks and watches or other mechanical devices that work similarly, using a series of gears driven by a spring or a weight.
Clockwork of mechanical Prim wrist watch
Clockwork of the Holy Cross Church in Dülmen, Germany
Keys of various sizes for winding up mainsprings on clocks
Mechanism of a Wall Clock, Ansonia Co. 1904
Wind-up toy
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A wind-up toy is an automaton toy powered by a clockwork motor.
Clockwork
…adjectives wind-up and spring-powered refer to mainspring-powered clockwork devices, which include clocks and watches, kitchen timers, music boxes, and wind-up toys. The earliest known example of a clockwork set-up is the Antikythera mechanism. This device functioned as a geared analogue computer after its creation…
A wind-up toy clown, the winding key being visible on the toy's back