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

hairspring

Chronometry; Clock

A slender hair-like coil that controls the regular movement of the balance wheel in a clock.

The older Hague clocks of the 17th century, of which only a few examples are known, contain a small rectangular movement, controlled by a short pendulum and verge escapement. The movement is attached ...

gridiron pendulum

Chronometry; Clock

It was apparent to John Harrison that the greatest error to be counteracted in pendulum clocks fitted with a good escapement was that due to expansion or contraction of the pendulum rod in heat or ...

greenwich time

Chronometry; Clock

Greenwich Mean Time or its modified form, British Summer Time, is the legal standard time of the United Kingdom. Greenwich Royal Observatory was set up in 1675, and one of its main objectives was to ...

great wheel

Chronometry; Clock

The first and usually largest wheel in a clock train. The wheel mounted on the line or spring barrel in going-barrel clocks, or on the fusee arbor in fusee clocks.

great and small hours

Chronometry; Clock

Sets of hour lines on German sundials of the 16th and 17th centuries are sometimes entitled 'Grosse Uhr' and 'Kleine Uhr'. These terms refer to the Italian (1 - 24) and the normal 2 X 12 equal-hour ...

gravity clock

Chronometry; Clock

Any clock which is driven by its own weight. The earliest appeared in the mid 17th century. They had a bracket in the form of an arm attached to the wall, the hand holding a chain on which the clock, ...