A zinc and steel compensation pendulum for a regulator clock having a dead-beat escapement is of fairly simple construction. For a seconds pendulum the central rod is of steel, 5/16 in. thick, and measures 45 in. from the bottom of the thread for the rating nut to the point of suspension. Over this rod, and restiug on the rating nut, is a zinc tube 26in. long andfrom 1/2 in. to3/16 in. thick. This tube slides freely over the rod. Outside the zinc tube, aud depending from its top end, is an outer steel tube (bicycle tube) 23in. long. At its lower end an outside collar is fixed, on which the bob rests. This is of lead, cast with a central hole having a shoulder in its centre. The upper part of the hole just frees the steel tube, and the shoulder rests on the collar. The lower part of the hole is large enough to clear the collar. Tuns the boh is supported at its centre and expands as much up as down. Its length is 9 in. and its shape cylindrical. For a 14-lb. bob 2i in. diameter will be suitable; for a I7-lb. bob 2 1/2 in. will do.