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Chronometry
The science of the measurement of time.
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Chronometry > 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 ...
recoil escapement
Chronometry; Clock
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 ...
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 ...
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 ...
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.
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