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 62
e Squirrel Cage Armature.—In the earlyexperiments with rotating magnetic fields, copper discs were used:in fact, it was then discovered that a mass of copper or any con-■■:g metal, if placed in a rotatin will be u /.ion of the field.Ferraris used a copper cylinder as in figs. 1,710 and 1,738,which… … NO DEFINITE PATH PROVIDED FORINDUCED CURRENTS
Electrical engineering
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