a clock driven or controlled by electricity. The common method of regulating clocks by electricity is to attach to each a device, consisting of an electro-magnet attached to a clockwork, which will cause the clock to be wound at frequent intervals, so that the motive power by which it is run will not vary. Some electric clocks are so connected with a central timepiece that the hands are adjusted at frequent intervals to agree with those of the regulating clock; but the most successful plan is to have all the clocks in the system operated from the regulating clock. In such a system there is but one complete clock, and all of the others are simply dials, with such wheelwork attached as is necessary to give the proper motion to the hour and minute hands. See CLOCK.