Chronometry

Chronometry

The science of the measurement of time.

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Chronometry > 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 ...

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 ...

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 ...

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 ...

pivot hole

Chronometry; Clock

The bearing in which a pivot runs.

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 ...