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 38
Fig. 28.—Two Parallel Bar Magnets, Unlike Poles Adjacent. porarily at least, study each one in detail as it is made, andreproduce the same by a sketch at the time it is being made. … * / • , » \ v . / / | I \ \ % / / \ \^; >-y i \ 4 ■ NH *• / Fig. 30.—Note-book Sketch of Fig. 26.
Electricity · Magnetism
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