Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 172
Fig. 127.—-A Current-Carrying Wire Attracting Iron Filings.. the filings when the current isflowing, and the attraction willbe equal on all sides of the wire,Fig. 127. When the circuit isbroken the filings drop off of thewire. Eiectroniagnetism, as distin- Fig. 128.—Graphical Magnetic Field…
Electricity · Magnetism
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