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

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 head of suitable ...

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 ring. Such dials are ...

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 easterly direction when ...

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 maintained by ...

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 pendulum with ...

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 connected horizontally ...

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 pointer, and was first ...