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

Caesium clock

Chronometry; Clock

The first caesium atomic clock was built in 1955 by Dr. Louis Essen and J. V. L. Parry of the National Physical Laborator. Earlier work in the United States had resulted in the National Bureau of ...

Calendar aperture

Chronometry; Clock

A slot in a dial which shows the day of the month engraved on a flat ring or annulus, toothed on the inner edge and moved every 24 hours by a pin in a 24-hour wheel geared to the hour wheel.

The function of a calendar work is to indicate the date, and in some clocks the day and month. A wheel rotating once in 24 hours carries a pin which engages with ratchet teeth on the calendar wheel ...

Calendar clock

Chronometry; Clock

Between 1860 and 1875 several patents were granted for mechanisms indicating the day of the week, the day of the month and the month of the year on a seperate dial below the time dial in the same ...

Cadrature

Chronometry; Clock

Another term for motion work, the mechanism lying immediately behind the dial outside the front plate, transmitting the rotation of the movement to the hands. The term may also include parts of the ...

Lyre clock

Chronometry; Clock

A form of banjo clock with a lyre shape, generally made of mahogany. It frequently has acanthus leaves coarsely carved on the centre panel, a base piece below the framed or panelled door and ...