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 136
Tigs. 1,930 and 1,937.—Core and shell types of three phase transformer. In the core typefig. 1,936, there are three cores A. B, and C. joined by the yokes D and D. This formsathree phase magnetic circuit, since the instantaneous sum of the fluxes is zero. Eachcore is wound with a primary coil P.…
Electrical engineering
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