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

hog's bristle

Chronometry; Clock

Prebalance-spring clocks sometimes had an adjustable arm carrying two hog's bristles positioned to bank the foliot or balance arms. They allowed finer adjustments of rate than were possible by ...

hodometer

Chronometry; Clock

A device which can be coupled to the wheels of a carriage to record the number of revolutions made by the wheel, from which the distance traversed along the road can be inferred.

hipp-toggle

Chronometry; Clock

A mechanism developed by Matthaus Hipp to maintain a pendulum in oscillation electrically (also called 'Hipp's butterfly switch'). The pendulum rod carries a free-swinging vein or trailer which ...

Charles McDowell, a Yorkshireman, pioneered the use of helical gearing in clocks early in the 19th century. Helical gearing allows more uniform transmission of power, even using high ratios, allowing ...

hardening, hammer

Chronometry; Clock

Brass, copper, gold, silver and certain other metals or alloys are hardened and made more resilient or springy by hammering them in a cold state on an anvil or stake. Hammer hardening produces a ...

hardening

Chronometry; Clock

The term used to describe any of the hot or cold methods of hardening metal. It is frequently followed by tempering. Some metals, like brass, can only be hardened by a cold working operation, while a ...

hanging-ball clock

Chronometry; Clock

A clock devised in the mid 17th century which enclosed a balance-controlled mechanism in a metal sphere to indicate the time by means of a band rotating on its circumference past a fixed pointer. The ...