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 182
, Fig. 144, and may be wound right or left- ELECTR OMA GNETISM. 163 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 are in the…
Electricity · Magnetism
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