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
ric 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 of a battery or other source of current. If iron filings be sprinkledover the card while the current is passing, they will arrange… … Fig. 114.—Right hand rule to determine the direction of magnetic field around a conductorcarrying^ current. The thumb of the right hand is placed along the conductor, pointingin the direction in which the current is flowing, then, if the fingers be partly closed, asshown in the illustration, the…
Electrical engineering
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