Practical calculation of dynamo-electric machines; a manual for electrical and mechanical engineers and a text-book for students of electrical engineering: continuous current machinery; (1902)
Wiener, Alfred Eugene · New York, Electrical world and engineer · leaf 221
the resistance of carbon, combination brushesconsisting either in copper brushes provided with carbon tips,Fig. 109, or in carbon brushes sliding upon the commutatorand having, in turn, copper brushes resting against themselves,Fig. no, are sometimes employed, and in case of very heavy D YNA MO-ELE… … COMBINATIONBRUSH COPPER BRUSH Fig. in.—Arrangement of Copper and Combination Brushes for Collectionof Large Currents. sparkless running of the machines. With the latter arrange-ment, the tension on the combination brushes should exceedthat on the copper brushes sufficiently to enable them to…
Electric machinery -- Design and construction · Electric machinery -- Direct current
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