down tothe lower button. The earliest movement of which any considerable numberwere sent out was that of the rotary winding from a three-pole motor, as shown in Fig. 137. Each of these magnetspools is of two ohms, with twelve ohms resistance, placedin parallel with the winding of each set of magnet… … Fig. 137 402 THE MODERN CLOCK. tures in the drum. There are three magnets marked O,P and X; each magnet has its own brush marked O, Pand X. When an armature approaches a magnet (see Fig.137) the brush makes contact with a point of the com-mutator, and remains in contact until the magnet has doneits…
Clocks and watches
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