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 147
ich shows the exist-ence of a reverse electromotive force in a motor. Ans. The apparatus required consists of a small motor,battery, and ammeter. They should be connected in one cir-cuit and the deflection of the ammeter observed when the arma-ture is held stationary, and when it rotates with… … Fig. 399.—Fairbanks-Morse field coil and pole piece. The field coils are wound upon ironforms, each layer treated with insulating compound. Afterward they are removed fromthe forms and baked hard and dry and finally wrapped with insulating materials ; allbut the three smaller sizes are wrapped with…
Electrical engineering
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