Escapement

Escapement

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The mechanism interacting with the balance wheel to extract energy from the powering source (the coil spring, mainspring, in a classic wristwatch) so as to turn the various wheels and thus the various dials or hands of a watch or clock.

An escapement drives the timekeeping element, usually a pendulum or balance wheel, in a clock or watch. It is powered by a gear train which is typically turned by a coiled spring or weight.