Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 107
range without sparking and at constant output. 96 WIRING DIAGRAMS OF ELECTRICAL APPARATUS ooo y oo \ i pO ^ Fig. 149.—Multiple voltage speed control. Switch connected to 1 gives the speed corre-sponding to 220 volts, and connected to 2, that corresponding to 110 volts. The field strengthremaining… … Fig. 151.—Series-parallel speed control. Switch 1 closed; motors in series; speed-1; switchesa and b closed; 1 open; motors in parallel; speed-2. D. C. MOTORS AND SPEED CONTROL 97
Electric wiring
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