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

In France in 1793, the Revolutionary government ordered decimalisation of the systems of measurement, including time. The new time, which divided the days into ten hours, the hours into 100 minutes ...

Dead-beat escapement

Chronometry; Clock

The dead-beat escapement is attributed to George Graham and was introduced c. 1730. This escapement gives excellent results over long periods when fitted to well-made clocks. The locking faces form ...

Day ring

Chronometry; Clock

Divided ring on a lunar dial that indicates the days in the 29 1/2 day lunar cycle.

Cylinder escapement

Chronometry; Clock

Sometimes called the 'horizontal escapement', a form of which was patented by Thomas Tompion in 1695 and subsequently perfected by George Graham. It will be found in many platform escapements fitted ...

Cushion top

Chronometry; Clock

The name given to the shaped tops of hoods of longcse clocks towards the end of the 17th century, when carved cresting went out of fashion. Cushion tops appeared in a variety of shapes, such as a ...

Atmos clock

Chronometry; Clock

The ancestor of the Atmos clock is the famous James Cox perpetual-motion clock c. 1760, now in the Victoria and Albert Museum, London. In 1913 J. E. Reutter considered by what means a perpetual clock ...

Astronomical clock

Chronometry; Clock

Public astronomical clocks were made in the late 14th and early 15th centuries. Most were inside cathedrals or churches, but some were outside and on public buildings. They represented a working ...