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 318
3. By altering the strength of the currentin the primary circuit. 4. By rapidly reversing the direction ofthe current in the primary circuit. o. By moving the iron core when a currentis flowing through the primary circuit. A momentary induced current which flows in the oppositedirection to that of… … Fig. 266.—Students Ex-perimental Induc-tion Coil. D.
Electricity · Magnetism
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