Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 376
n alternatorsbecause there is no tendency to spark at the brushes, as indirect current machines, and copper is a much better con-ductor. In very low voltage dy-namos copper brushes are used toadvantage. 334. Armature Core Insula-tion.—The armature cores of alllarge generators are slotted forthe… … Fig. 338.—Coramu tator Hub.Made of brass or iron Fig. 339.—Forged Copper Com-mutator Bar. 358 PRACTICAL ELECTRICITY. HUB slots and formed rings or segments of the same material arcused upon the ends of the cores. The quality of the insulationand the care required in insulating increases directly…
Electricity · Magnetism
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