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

Add a new term

Contributors in Clock

Become a Contributors

Clock

Rating nut

Chronometry; Clock

The knurled nut supporting the pendulum bob. To bring a losing clock to time, the pendulum bob is raised by rotating the rating nut clockwise. Conversely, to bring a gaining clock to time, the ...

Ratchet wheel

Chronometry; Clock

A wheel cut with teeth like a saw and used in conjunction with a click or pawl to make rotation possible in one direction only.

Ratchet

Chronometry; Clock

A mechanism allowing rotation in one direction only. A ratchet wheel having teeth of saw-tooth shape engaged by a click is used to prevent a mainspring unwinding.

A small toothed wheel driven by a gear. In clock gear trains a pinion is usually the smaller driven member, and normally has less than 20 teeth, which are termed 'leaves'. The hypocycloidal form is ...

Pinch-waisted

Chronometry; Clock

Traditional clock style with the crown and case wider than the part of the clock enclosing the pendulum.

Pillar-and-scroll clock

Chronometry; Clock

A shelf clock attributed to Eli Terry, having a column on each side, a scroll-cut pediment and three finials on top.

Pillar sundial

Chronometry; Clock

The pillar dial is an altitude dial, sometimes called a 'column' or 'cylinder' dial; the old name was 'chilindre'. It consists of a vertical pillar, usually of constant cross-section, mounted on a ...