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

Warning piece

Chronometry; Clock

A projection on the lifting piece of a striking clock which intercepts a pin in the warning wheel and holds the striking train ready until the exact hour of striking.

Warning wheel

Chronometry; Clock

Usually the penultimate wheel in a striking train, carrying a pin which locks the striking train after release, until the lifting piece falls at the hour and the clock strikes.

A clock with multiple dials, which indicates the time in various parts of the world, all the dials being driven in synchronisation from one master-clock movement. The universal clock is also known as ...

Universal ring sundial

Chronometry; Clock

A ring dial is for use in a fixed latitude, but the universal ring dial can be used over a wide range of latitudes. It consists of three rings and a strip with slider. A flat vertical brass ring, ...

Universal-time dial

Chronometry; Clock

For some time clockmakers have attempted to show the comparative time in different parts of the world; this became really important after the invention of the electric telegraph. A clock by Thomas ...

Up and down dial

Chronometry; Clock

A subsidiary dial, usually in the twelve o'clock position on a marine chronometer or precision pocket watch, which indicates the degree to which the mainspring is wound at the time of observation. It ...

Turret-clock pendulum

Chronometry; Clock

Early turret clocks used wrought-iron pendulum rods, which were forged bars of rectangular section. The rating nuts were wing nuts formed from a long thin rod wound into spirals. Wooden rods were in ...