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accurate American anchor escapement astronomical clock astronomical dial atomic clock automata balance spring balance wheel barrel became bell brass Breguet calendar called Cathedral centre century chronometer clockmakers Company count wheel crown wheel detent escapement Dondi earliest early Earnshaw Earth electric enamelled England English engraved escape wheel factory foliot frame French fusee gearing hand hole Horological Huygens idea impulse indicated industry invented jewels John Harrison known lantern clock later Left lever escapement London longcase clock longitude makers manufacture mechanical clock ment metres minutes moon moved movement Mudge Museum Observatory original oscillator patent pendulum clock pinion pivot plate production quarter quartz quartz clocks Right ring rotated Royal shadow shelf clock shows stars stone striking train sundial swing Swiss teeth temporal hours Thomas Tompion timekeeping timepiece tion Tompion toothed tower turned turret clocks verge escapement watchmakers water clock weight winding wooden wound