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 278
tisfactorily is suggested by the elementary magneto connected in the circuit, indicatingan alternating current of low frequency, but not necessarily of low pressure. accordingly said to be polarized, and the direction of movementof the latter depends on the direction of the current around… … C -< »-• C .2 fe- D.* o o g ***** O n polarity is strengthened, whilethat at nf is destroyed, the polefor the time being south. Theright hand pole of the armaturewill thus be attracted and theleft hand pole repelled. Simi-larly, when the current reverses,as in fig. 3,247, the polarity ofM and M…
Electrical engineering
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