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

punch

Chronometry; Clock

A steel or brass rod, used to transmit pressure or a sharp blow to a required point. Punches are made for many purposes, e.g. Making centers before drilling, and for riveting, chasing, matting, ...

A wheel grooved on its circumference to retain a rope or line. The weight of an eight-day clock is usually hung from a pulley. The line passes from the barrel round the pulley and is attached to the ...

pull winding

Chronometry; Clock

Thirty-hour longcase clocks are usually arranged for pull winding on Christiaan Huygens's system. The length of rope or chain between the smaller weight and the ratchet wheel is pulled down, thus ...

projection clock

Chronometry; Clock

A form of night clock incorporating an internal light and projection lenses to throw an image of the dial and hands on a wall or other convenient surface. The idea dates back to the 18th century, and ...

precession of the equinoxes

Chronometry; Clock

The positions of the equinoxes are determined by the position of the Earth's axis, and if this was constant in direction the equinoxes would remain fixed in position in relation to the fixed stars. ...