Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 175
handed, is another reason for assumingthat a current has direction. The direction of current in anyvertical wire can thus be determined by a single magneticneedle, by noting the general direction its N-pole points whenpresented near to the wire. If the N-jiole points clockwise as you look down upon… … rroisthereon indicate dircptionof Currents Field of Fore Fig. 134.—A Magnetic Body Free to Move, etc., ^| 43. Exp. 50: Figs. 132 and 133 show a plan view of the position of theneedles on a horizontal piece of cardboard, with a verticalwire passedthrough it, when the current flows in opposite…
Electricity · Magnetism
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