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Chronometry
The science of the measurement of time.
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Chronometry > Clock 
hour wheel
Chronometry; Clock
The wheel in a clock which carries the hour hand and forms the last member of the motion train, usually rotating twice in 24 hours.
hour and half-hour striking
Chronometry; Clock
Sometimes referred to as 'French striking'. Besides striking the hour, the clock strikes once at the half-hour, usually on the hour bell.
horologium
Chronometry; Clock
The term was used in medieval manuscripts to denote any sort of timekeeper, were it a weight-driven clock or a water clock or a sundial. Consequently the researcher has to be wary ...
horizontal sundial
Chronometry; Clock
The commonest form of sundial, in which the shadow of a gnomon whose edge is parallel to the earth's axis falls on a horizontal surface. Usually this carries only the hour lines, ...
hooded clock
Chronometry; Clock
A type of wall clock in which only the movement and dial are enclosed by a hood and the weights and pendulum hang down below. This is a considerable disadvantage as the pendulum ...
hollow column clock
Chronometry; Clock
E. & G. Bartholomew, casemakers at Bristol, Connecticut, introduced the hollow column Connecticut shelf clock for 30-hour wooden movements c. 1830. This Empire-style case had a ...
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