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

planetary clock

Chronometry; Clock

It has been suggested that such clocks were originally devised to provide a driving mechanism for models showing the planetary system, and that telling the hours of the day was a secondary ...

planetarium

Chronometry; Clock

A mechanically operated device in which the revolutions of the Earth and the other planets around the sun are represented on a dial or dials; they may be hand-operated or clock-driven. Richard of ...

pivoted-detent escapement

Chronometry; Clock

During the 18th century, great efforts were made to develop a practical marine chronometer. John Arnold and Thomas Earnshaw, working on entirely different lines, developed the detent escapement, ...

pivot, conical

Chronometry; Clock

Cheap alarm-clock balance staffs often utilize a cone-shaped pivot. In higher-grade work the term also applies to pivots designed to run in capped jewel holes. The acting part is parallel; the ...

A gauge for measuring the diameter of clock pivots. It consists of two flat steel plates fastened together by strips of metal at their ends to form a tapered slot between the inner plate edges. The ...