Congreve clock
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A Congreve clock is a type of clock that uses a ball rolling along a zigzag track to regulate the time. It was invented by Sir William Congreve in 1808. The ball takes between 15 seconds and one minut
A rolling ball clock from 1820 in the British Museum.
Congreve Rolling Ball Clock
Escapement
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An escapement is a mechanical linkage in mechanical watches and clocks that gives impulses to the timekeeping element and periodically releases the gear train to move forward, advancing the clock's ha
Congreve clock
…time. It was invented by Sir William Congreve in 1808. The ball takes between 15 seconds and one minute to run down the zigzag track, where it trips the escapement which in turn reverses the tilt of the tray and at the same time causes the hands of the clock to move forward. Thus the angle of the plate reverses…
Original drawing (c. 1637) of Galileo's pendulum clock and escapement
Pin wheel escapement of South Mymms tower clock
First detent escapement by Pierre Le Roy 1748
Earnshaw's detent escapement, used widely in chronometers