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

Augsburg clock

Chronometry; Clock

Augsburg clockmakers specialised in automata which performed as the clock went, or when it struck, or indicated the time by slowly revolving and pointing to the hours on a dial. These clocks were ...

Atomic clock

Chronometry; Clock

Atomic and molecular vibrations constitute the most regular of motions in nature, but most are at such a high frequency as to be unusable as time standards. Radio-frequency techniques are used to ...

Act of parliament clock

Chronometry; Clock

A British act of parliament passed in 1797 levied a tax of five shillings per annum on all clocks and is said to have caused a decline in their manufacture. Rather than maintain a domestic clock ...

30-hour train

Chronometry; Clock

The 30-hour train has one wheel and pinion fewer than the eight-day clock. In the common 30-hour longcase train, the motion wheels are driven directly from the great-wheel arbor. Many 30-hour ...

The Japanese system of dividing the day, which was similar to that used in Europe in the Middle Ages, continued in use until 1873. The daylight period, including a considerable amount of twilight, ...

Adjustable sundial

Chronometry; Clock

This usually consists of a horizontal dial with a small number of concentric hour scales, each for use in a single latitude, with a gnomon whose inclination can be varied. Dials of this type were ...