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

reflecting circle

Chronometry; Clock

An elaborated form of the sextant used for measuring the large angles required in the determination of longitude by the method of lunar distances.

red stuff

Chronometry; Clock

A refined red oxide of iron which is used for polishing gold, silver, brass and steel work. It is sold in various grades of fineness; the coarse, hard type, bluish-purple in color, is known as ...

The recoil escapement most commonly found in pendulum clocks, first used in the last quarter of the 17th century. In an anchor escapement from a 19th-century bracket clock, the escape wheel rotates ...

reamer

Chronometry; Clock

Reamers are similar tools to broaches though not made in such small sizes. They have a number of spiral or straight longitudinal flutes to form the cutting edges, and are made for either hand or ...

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.