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 138
PERMEABILITY =§ H / … Figs. 120 and 121.—Illustrating the effect of introducing an iron core into a solenoid. _ In theupper figure, the air space or air core surrounded by the solenoid offers considerableresistance to the passage of magnetic lines, allowing only a small number to pass through.If a piece of iron be…
Electrical engineering
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