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

An 18th-century bracket or shelf clock, made almost throughout the century, recognized from the shape of its case and the bronze ornament. The case usually incorporated mirrors, or else was made of ...

Roman numerals

Chronometry; Clock

Roman letters used as numerals on clock dials, such as I, II, III, IV, etc. On older clocks, four was often represented by IIII, an old Roman numeral for IV. It is said that this form better balances ...

Roman dial

Chronometry; Clock

A dial with Roman numerals (I, II, III) frequently used in traditional style carriage, mantel, wall, tabletop, and anniversary clocks.

rolling-leaf pinion

Chronometry; Clock

To reduce friction, lantern pinions are sometimes made with the leaves pivoted to allow them to rotate.

rolling-ball clock

Chronometry; Clock

The principle of the rolling-ball clock was defined by Galileo: a ball rolling down a constant slope takes the same time to cover the same distance at any part of the slope. This principle was first ...

roller

Chronometry; Clock

In the lever escapement, the cylindrical metal piece mounted on the balance staff and carrying the impulse pin; it also performs the safety action. In English work, the single table roller with ...

rococo

Chronometry; Clock

The decorative style which succeeded baroque during the first half of the 18th century. Compared with the monumental symmetry of baroque ornament, the asymmetrical shapes of rococo are lighter, more ...