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 34
s attracted by a magnet, and then sus-pending the magnet and permitting the iron to occupy theprevious position of the magnet ; or the magnet may befloated on a cork in a jar of water, and it will be equallyattracted by the piece of iron. 22. Magnetic Lines of Force.—The magnetic force ema-nates in… … ■Exploring the Magnetic Field. small dipping needle, as in Fig. 21, or a magnetised sewingneedle suspended by a thread from its centre, as in Fig. 22,may be used. With the bar magnet flat on the table, placethe exploring needle a short distance above the } f I f f \ magnet, midway betweenits two…
Electricity · Magnetism
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