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The detent escapement: from marine chronometers to wristwatches An escapement is a device in mechanical watches that transforms the energy from the unwinding of a coiled spring (the power source) into countable impulses. In particular, each swing of the balance wheel releases a tooth of the escapement s escape wheel gear, allowing the clock s gear train to advance or escape by a fixed amount. This regular periodic advancement moves the clock s hands forward at a steady rate. Without the escapement, the spring would unwind in a few seconds making the wheel turn too fast, just like a coil spring that, compressed between two fingers, is released suddenly.

City ofUnited kingdomPeter baumbergerRupert gouldThomas mudgeThomas earnshawJohnmr knudsenKari voutilainenJohn arnoldPierre leroyDerek prattMark headrickJurgen jurgensenCourtesy of the national maritime museumDanish navyMarine chronometer