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- · New York, T. Audel · leaf 173
inutes, themain switch should be opened, otherwise the machine may beseriously injured. 592 HAWKINS ELECTRICITY Oues. How does an excessive current injure a dynamo? Ans. By causing it to overheat which destroys the insulationof the armature, commutator, etc. Lubrication.—The shaft bearings of… … Fig. 683.—Imaginative view of a shaft showing its rough granular structure. In operationthese minute irregularities interlock and act as a retarding force, or frictional resistance.Hence, the necessity for lubrication—a lubricant presents a thin intervening film againstwhich the surfaces rub. with…
Electrical engineering
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