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 63
VENTILATING.DUCTS Pigs. 1,738 to 1,744.—Evolutionof the squirrel cage armature.The early experiments of Arago,Herschel, Babbage and Bailydemonstrated that a mass ofcopper oranyconductingmetal,if placed in a revolving mag-netic field, will be urged to re-volve in the direction of therevolving field.…
Electrical engineering
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