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. 145.Solenoid. Fig. 146.—Polarity of the Helix.The whirls of one turn unite with those of the next. the turns constituting the field, or total number of lines offorce passing through the helix. This diagram shows the di-rection of current through the helix, the direction of the 164 PRACTICAL…
Electricity · Magnetism
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