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Detent escapement

This mechanism has been used above all in marine chronometry; it is expensive and delicate, requires flawless execution and does not lend itself readily to mass production. It is therefore an excellent escapement which, if made well, delivers the greatest timekeeping accuracy. The detent escapement delivers only one impulse per oscillation to the balance (the lever escapement delivers two). This escapement is easily recognisable by its characteristic "tick-tock" noise - one loud and one soft beat.