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

time measuring mechanisms

Chronometry; Clock

All time measurements, whether by differential or integrative methods, originally required the attention of a watchman. The need for such attention only ceased when, besides automatic means of ...

The presumed-unvarying flow of time is measurable differentially by observing a constant-rate process such as the movement of the sun's shadow on an equatorial sundial, or integratively by counting a ...

time and strike (T & S) clock

Chronometry; Clock

A clock that both tells the time and strikes or chimes.

tidal dial

Chronometry; Clock

A fine example of the clockmaker's ingenuity. Two sets of Roman numerals, from one to twelve, were engraved, usually in the dial arch alongside the 29 1/2 days of the moon's phase. By adjusting an ...

tic-tac escapement

Chronometry; Clock

A form of anchor escapement in which the anchor only spans one to three teeth of the escape wheel. It is fitted to French drum clocks with short pendulums swinging through a large arc. Sometimes one ...

ticket clock

Chronometry; Clock

An American invention of 1903 utilizing the spring-like properties of then celluloid sheet. Two small circular drums bear a large number of small celluloid tickets free to pivot at the point of ...

thirty-hour clock

Chronometry; Clock

A clock which requires to be wound daily, with a margin of generally something over six hours to allow for a delay in rewinding. In particular, the name is associated with longcase clocks of 30-hour ...