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

Jumper

Chronometry; Clock

A spring-loaded arm, a type of click, shaped to hold the teeth of a star wheel stationary between movements, although allowing the wheel to rotate in either direction.

Jockele clock

Chronometry; Clock

The usual size for the movement of a Black Forest clock is about 6 1/4in. High, 4 1/4in. Broad and 5 1/2in. Deep. About 1760 a smaller version was made nicknamed Schottenuhr, and about 1790 Jakob ...

Jewelling

Chronometry; Clock

One of the early improvements in clock making was the replacement of brass pivot holes with pierced jewels. Precision timekeepers were jewelled with natural ruby or sapphire; in work of lower ...

Japanning

Chronometry; Clock

A pseudo-oriental form of decoration simulating Chinese or Japanese lacquer work. Japanning was extensively employed for decorating longcase clocks throughout much of the 18th century. Black with ...

Like most astronomical and horological conventions in Japan before the advent of the Europeans, sundials were probably imported during the Asuka period (6th century AD) from T'ang China. The sundial ...

Hairspring

Chronometry; Clock

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

Lathe

Chronometry; Clock

A machine in which metal, wood or other material is mounted horizontally, rotated, and cut or turned. Material to be revolved in a lathe is mounted either between the centres of the lathe or fixed to ...