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

crystal

Chronometry; Clock

Flat or convex piece of glass that covers the dial. Usually fitted into a brass bezel.

A modified form of universal-ring dial in which the ring is divided into two equal semicircular portions placed back to back. The division is made at the '12' marks, so that the semicircles face due ...

coup-perdu escapement

Chronometry; Clock

This escapement is sometimes found in high-quality French clocks; it enables a seconds hand to jump full seconds with a pendulum which beats half-seconds. This is usually achieved by a form of ...

contrate wheel

Chronometry; Clock

A wheel cut with teeth on one face which mesh with a pinion at 90? used in verge clocks to drive the vertical escape pinion. The contrate wheel is also found in platform-escapement carriage clocks, ...

cornice

Chronometry; Clock

Topmost molding of a clock case. The 833-W is a great example of a well-defined cornice.

constant-force escapement

Chronometry; Clock

Also known as 'remontoire escapement', and having many differing designs. These escapements achieve a uniform impulse by the use of the driving force to wind an auxiliary spring or weight during a ...

conical pendulum

Chronometry; Clock

A pendulum with a bob describing a horizontal circle, used in some Victorian novelty clocks and also to control the driving mechanism of equatorially mounted telescopes. The pendulum is normally ...