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 98
se coils undergoing commuta-tion. They are large, because the maximum transformer actionoccurs in them, that is, in the coils short circuited by the brushes. 1,356 HAWKINS ELECTRICITY Ques. Why do the local armature currents causesparking? Ans. Because of the sudden interruption of the large… … Fig. 1.879.—Field of Sprague single phase compensated repulsion motor. The frame is of theskeleton form which exposes the core, giving effective heat radiation. The single phasefield winding is of the distributed concentric type. To facilitate connection to circuits ofeither 110 or 2l0 volts, four…
Electrical engineering
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