Clock

Clock

Any instrument other than a watch for measuring or indicating time, especially a mechanical or electronic device having a numbered dial and moving hands or a digital display.

Industry: Chronometry

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Clock

Equation clock

Chronometry; Clock

The challenge of devising a clock which recorded solar as well as Greenwich mean time occupied the great makers of the golden age of English clockmaking, men like Thomas Tompion and Daniel Quare. ...

The age of the moon on 1st January in any year; when this is known its age at any subsequent date in the year can be deduced. Since twelve lunations equal 354-36 days and a year equals 365. 24 days, ...

Engraving

Chronometry; Clock

Engraving was used extensively in the decoration of clocks, for dial centers, back plates, cases, hour, minute and second numerals, and the maker's name. Numerals when engraved were usually filled ...

Wheel-cutting engine

Chronometry; Clock

A wide variety of wheel-cutting engines have been made over the past three centuries, but all follow more or less the same general principle. It is generally agreed that the wheel-cutting engine ...

Rack clock

Chronometry; Clock

A clock which uses its own weight as motive power and gradually descends a toothed rack which meshes with the first wheel of the train. Winding is effected by pushing the clock to the top of the rack ...

Rack

Chronometry; Clock

A number of gear teeth cut along a bar enabling rotary motion to be converted to linear motion. Also, in striking clocks, the arm cut with ratchet-shaped teeth which count the number of blows to be ...

R-A regulator

Chronometry; Clock

Slang term for wall regulator with "R-A" on the pendulum. "R" stands for retard by turning the adjusting nut toward R to lower the pendulum bob. "A" stands for advance by turning the adjusting nut ...