Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1068
ying the speedin revolutions per second by the number of pairs of poles.The number of cycles is usually spoken of as the frequencyof the alternator. The Dynamo 1039 The usual frequencies are forpower 25^ for motor cir-cuits;, and arc lamps ^^, and for incandescent lighting 133. The Direct Current… … Fig. 432 »SIMPLE D. C. GENERATOR. THE ARMATURE HAS MADE HALF AREVOLUTION, BUT BRUSH M IS STILL POSITIVE is called the positive brush. In wire CD the current flowsfrom C to D^ making P the negative brush. After half a revolution the wire CD is over where ABwaSj and is now delivering the current…
