Chronometry

Chronometry

The science of the measurement of time.

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Chronometry > Clock

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 ...

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 ...

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 ...

cup sundial

Chronometry; Clock

A form of scaphe dial, namely a dial with a hollowed-out surface. The term can be applied to a chalice dial, but it more often refers to dials with hour lines engraved in a ...

cross-beat escapement

Chronometry; Clock

This 16th-century escapement was an early attempt to improve on the verge. The friction caused by the necessity of coupling the two pallet staffs by gearing or cranks must reduce ...