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 38
—— -—— spisi&rf m … Fig. 31.—Repulsion BetweenLike Poles. Fig. 32.—Magnetic Field of theYnd of a Bar Magnet. 20 PRACTICAL ELECTRICITY. Many other possible combinations of magnets to produce thesemagnetic figures will occur to the student. A thoroughknowledge of the direction of lines of force, as depicted by
Electricity · Magnetism
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