Regulator
The small steel hand or lever to the shorter end of which the curb pins are attached, and which by moving from side to side practically shortens the hairspring. (See Curb Pins.) 2. A standard clock having a compensating pendulum and used for timing watches and clocks.
REID, THOMAS. Born in 1750 and died in 1834. He was a celebrated Scotch horologist and the author of a treaties on watch and clockmaking.