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 233
it Fig. 187 Fig. 188 234. The Commutator.—The commutator usually consistsof a number of similar wedge-shaped pieces of copper clampedbetween two rings, as shown in Figs. 189 and 190, and in-sulated from each other by mica or other insulating materialwhose wearing qualities are practically the same…
Electrical engineering
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