A clock, or other timepiece, used as a standard of correct time. See Astronomical clock (a), under Clock.
A weight-driven pendulum clock with the emphasis on accuracy of timekeeping rather than on ornament. Regulators are usually in the form of a longcase clock, with a temperature compensation facility for the pendulum, a deadbeat escapement, and no striking mechanism. Workshop regulators were made by the clock-maker for his own use, to set other clocks by. Table regulators are spring-driven with a deadbeat escapement and a regulator dial - one with minutes marked on the edge of the main dial and two smaller, separate dials for hours and seconds. See vienna regulator