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 204
Fig. 172.—Current Anti-Clockwise—N-Polarity. ELECTROMA GNETS. 185 … 173.—Current Clock-wise—S-Polarity. are bent out of their natural direction and converge into thesteel. There are now more lines of force passing throughthe space occupied by the steel than when this space wasoccupied by air alone. The carpahilityof any substance for conducting mag-netic lines of…
Electricity · Magnetism
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