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 182
d to a floating batteryand is free to move. ELECTROMA GNETISM. 1C3 handed. The polarity can be reversed by re-winding in theopposite direction and passing the current, as indicated inFig. 144, or by simply sending the current through the helixin the opposite direction.A solenoid is a coil of… … Fig. 144.—Direction of the Field of aHelix. of thread. The spirals of ahelix or solenoid are equivalent in their magnetic action to asmany circular currents as there are convolutions of wire, sincetheir axes lie in the same straight line. The magnetic whirlsof each turn inside the helix arc in the…
Electricity · Magnetism
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