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Chronometry
The science of the measurement of time.
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Chronometry > Clock 
dial clock
Chronometry; Clock
During the latter half of the 18th century the English dial clock appeared, a descendant of the so-called 'Act of Parliament' or 'tavern' clock. Originally timekeepers only, ...
detent
Chronometry; Clock
A catch which is moved into the path of a wheel. In the Harrison maintaining power, the detent is the pawl which is pivoted to the plates and engages the maintaining-power ...
detached-lever escapement
Chronometry; Clock
This escapement, which has finally ousted all others in mechanical balance-controlled timekeepers, was first invented in the mid 18th century, although its merits were not fully ...
depthing tool
Chronometry; Clock
A tool to determine the correct distance apart and depth of engagement of wheel teeth and pinions. It has a pair of parallel runners between the centers of which two wheels, or ...
declination
Chronometry; Clock
The angular distance of the sun, moon or other heavenly body north or south of the celestial equator. Because of the inclination of the Earth's axis to the plane of its orbit, the ...
decimal clock
Chronometry; 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 ...
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