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

Quartz

Chronometry; Clock

Electronic transistorised movements that work on battery energy and require no winding or plug-in electricity. A tiny quartz crystal, vibrating at a high frequency, allows the clock mechanism to ...

In its simplest form, a quarter-circle of metal, ivory or wood, with a pair of sights along its upper edge, a scale of degrees inside its curved edge, and a light plumb-bob on a string hanging from ...

Punch, bell

Chronometry; Clock

A self-centering punch, with a centre punch point at one end, designed to slide down a tube or sleeve which has a cone- or bell-shaped mouth. With the bell mouth placed directly over the end of a ...

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 centres before drilling, and for riveting, chasing, matting, ...

Pulley

Chronometry; Clock

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 ...