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 197
the north pole. THE DYNAMO: CURRENT COMMUTATION 177 Ques. Describe in detail the action of the four coilswound around the ring as in fig. 184. Ans. According to the laws of electromagnetic induction,pressures are set up at the ends of the coils such as tend toproduce currents in the directions… … 3£0 Fig. 185.—Gramme ring armature with four coils. The electromotive force induced in coilsA, A reaches the zero point at the instant that of coils B, B is at a maximum; hence,sine curve No. 1, beginning at zero, and No. 2, at the maximum, show the pressure changesfor A, A and B, B, respectively.…
Electrical engineering
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