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Chronometry
The science of the measurement of time.
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Chronometry > Clock 
riveting
Chronometry; Clock
In clockmaking certain parts such as metal plates are sometimes fastened together with rivets, which are pins or pegs generally of the same metal as the parts being joined, with a ...
ring sundial
Chronometry; Clock
An altitude sundial in which the time is shown by light rays passing through a small hole in a ring, giving a spot of light on a set of hour lines on the inner surface of the ...
right ascension
Chronometry; Clock
The angle between the plane containing any celestial body and passing through the poles, and a similar plane passing through the point of the spring equinox, measured in an ...
riefler escapement
Chronometry; Clock
The development of escapements has aimed at reducing interference to the pendulum by the movement. Earlier this century, Sigmund Riefler produced a clock the pendulum of which is ...
Riefler clock
Chronometry; Clock
Sigmund Riefler of Munich became the most famous maker of regulator clocks for observatory use, continually striving for perfection of timekeeping. He invented a mercury-in-steel ...
rhomboid pendulum
Chronometry; Clock
A form of pendulum sometimes seen on turret clocks, though rarely on domestic clocks, in which the rod takes the form of a diamond-shaped frame composed of four steel strips ...
revolving-band clock
Chronometry; Clock
A clock on which time is shown by numbered bands revolving past a fixed marker. The idea possibly developed from early Gothic moving-dial clocks which similarly had a fixed ...
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