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

The striking system known by the German term Sürrerwerk ('whizzing work') has been recorded in Italian and German clocks during the 18th and 19th centuries, and variants of the device are known from ...

Surprise piece

Chronometry; Clock

A plate attached to the quarter-snail and free to move forward as the star wheel is advanced. It prevents the wrong quarter being struck by a repeating clock, close to the hour.

Stutzuhr

Chronometry; Clock

The German verb stutzen means to cut down in size, and as applied to a clock it implies one not made to stand independently, like a longcase clock, but needing a pillar, piece of furniture or ...

Rotten stone

Chronometry; Clock

A natural friable stone, resulting from the decomposition of a siliceous limestone, which is a powerful abrasive. It is obtained either in crushed form, when it is mixed with oil to form a polishing ...

Rotating pendulum

Chronometry; Clock

A feature found on both keywound and quartz (battery) anniversary clocks. characterised by decorative balls in crystal or metal finish.

Rope line

Chronometry; Clock

Rope is often used to drive early lantern-frame clocks and has a special open weave which is not easily damaged by the spiked pulley. Clock rope is still available in various thicknesses.

Roman striking

Chronometry; Clock

Joseph Knibb designed clocks of long-running duration, and to reduce the power requirements of the striking train, he devised a system of striking which utilised one bell for the Roman numeral I and ...