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

A flat circular plate fitted to a wheel- or pinion-cutting machine, or to a lathe spindle or dividing accessory for a lathe or other machine. On the plate a number of concentric circles are marked, ...

Dividing

Chronometry; Clock

This term refers to dividing the length, diameter or circumference of circles as required, by means of dividers or dividing plate, or by other means. Clockmakers use dividing plates to produce ...

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 utilise 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 ...

Pivot gauge

Chronometry; Clock

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 ...