Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 34
at which it is 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 tefloated on a cork in a jar of wrater, and it will be equallyattracted by the piece of iron. 22. Magnetic Lines of Force.—The magnetic… … 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 fit II magnet, midway betweenits two poles. The nee- x^die takes up a…
Electricity · Magnetism
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