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reconstruction of the waterpowered mechanical clock
How do atomic clocks work?
weight-driven clock works Great Clock, Rouen, Fr. Labeled diagram of a watch mainspring mechanism showing interconnected gears, the mainspring, balance wheel, winding pinion, escape wheel, and hands for hours, minutes, and seconds. Diagram of an anchor escapement mechanism showing a pendulum attached to pallets that interact with an escape wheel, illustrating how this system regulates time in pendulum clocks. clock Diagram of a verge-and-foliot escapement mechanism in a mechanical clock, showing the escape wheel, vertical verge shaft with pallets, horizontal foliot bar, and regulating weights. Diagram of a pendulum clock with labeled internal components, including the pendulum, driving weight, barrel, gears, anchor, pallet, escape wheel, and the clock face showing the hour, minute, and second hands. Diagram of a quartz watch showing labeled internal components, including gears, battery, quartz oscillator, microprocessor, circuit board, coil, magnet, and motor, overlaid with a partial clock face.
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barometer. Antique Barometer with readout. Technology measurement, mathematics, measure atmospheric pressure
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reconstruction of the waterpowered mechanical clock
reconstruction of the waterpowered mechanical clock Reconstruction of the waterpowered mechanical clock built under the direction of Su Sung, ad 1088. By John Christiansen after Joseph Needham, et al.

clock

measurement device
Written by
Jonathan D. Betts
Curator of Horology, Royal Observatory Greenwich, National Maritime Museum.
Jonathan D. Betts
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Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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clock, mechanical or electrical device other than a watch for displaying time. A clock is a machine in which a device that performs regular movements in equal intervals of time is linked to a counting mechanism that records the number of movements. All clocks, of whatever form—whether 12-hour clocks or 24-hour clocks—are made on this principle. See also atomic clock; nuclear clock. The origin of the all-mechanical escapement clock is unknown; the first such devices...

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