Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 376
d made to press against the commutator byspring pressure. Details of the brush holderare shown in Figs. 304 and 361. The brushholder stud or shaft is securely bolted to, butinsulated from, the rocker arm*, and connectedby flexible cables to the external circuit.The function of the rocker arm is to… … Fig. 338.—Commu tator Hub.Made of brass or iron tation. Fixedbecause there is no tendencv direct 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…
Electricity · Magnetism
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