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 38
Fig. 30.—Note-book Sketch of Fig. 26. Fig. 31,—Repulsion BetweenLike Poles. rltff>f-««fh«rl^flfaf,VtlSR … iNfc«i Fig. 32.—Magnetic Field of theEnd of a Bar Magnet. 20 PRACTICAL ELECTRiClfY, 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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