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 462
quirements of a conduit system? Ans. Perfect drainage; conductor inaccessible from surfaceto anything except the contact shoes; good insulation of the ELECTRIC RAILWAYS 2,553 conductors; provisions for expansion and contraction; acces-sibility for repairs. Motors.—The severe operating conditions of… … Fig. 3,515.—Direct current railway motor, casing open; as shown, the essential working partsof the motor consists of an armature A, with a commutator at B; the brushes C C, whichserve to carry the current from the trolley line into and out of the armature; and the fourpoles between which the…
Electrical engineering
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