Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 41
of thecommutator. Hence, if the short circuiting brush be a positive brush,no harm will be done by three other positive brushes touching at theother points. If these other brushes be broad enough to bridge acrosstwo commutator bars, they may effect commutation, that is, threerounds instead of one… … Fig. 277.—Showing effect of removing two of the brushes in fig. 275. If no spark difficultiesoccur in collecting the current with only two brushes, the arrangement will work satis-factorily, but the heat losses will be greater than with four brushes. Ques. How many paths are possible in parallel?…
Electrical engineering
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