Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 274
al brush would be^in a strong magnetic field in theordinary machine and, as a result,there would be considerabletrouble encountered in properly commutating the current. This additional brush, however, canbe connected to a coil that is located in a weak magnetic fieldand the commutation greatly… … Fig. 219
Electrical engineering
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