International Library of Technology · Scranton, International Textbook Co. · leaf 499
either the effect of variations in thecurrent on the magnetizing force of the field may be neu-tralized or the effective E. M. F. of the armature may bealtered to suit the conditions. The former result may beobtained by placing an adjustable resistance in parallel withthe magnetizing coil, as… … Fig. 1195. seen that the current divides between the two branches ofthis part of the circuit, and by varying the resistance R theproportion of the whole current that flows through themagnetizing coil 5i^may be varied as required. The method of varying the effective E. M. F. that is usedin the…
Electrical engineering
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