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 133
n the direction of the arrow n. it be above or below the needle, and 2, on the direction in whichthe current flows through the wire. To keep these movements in mind numerous rules have beensuggested, of which the following will be found convenient: Corkscrew Rule.—If the direction of travel of a… … Tneri/jbuw Fig. 113.—Experiment showing direction of lines of force in the magnetic field surrounding aconductor carrying an electric current. A piece of copper wire is pierced through thecenter of a sheet of cardboard, and carried vertically for two or three feet then bentaround to the terminals…
Electrical engineering
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