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 204
Fig. 172.—Current Anti-Clockwise—N-Polaritv . ELECTIiOMAdXETS. 185 … j 3.—Current Clock-wise—S-Polarity. are Lent out of their natural direction and converge into theBteel. There are now more lines of force passing throughthe space occupied by the steel than when this space wasoccupied by air alone. The capabilityof any substance for conducting mag-netic lines of…
Electricity · Magnetism
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