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 320
Fig. 271.—Direction of Momentary Induced Currents in theSecondary Circuit. each make and break of the primary. Whether the circuitsare wound in flat spirals or in cylindrical coils, Fig. 271, thesame principles apply. The induction coil, •^ 300, is con-structed on this principle.287. Third…
Electricity · Magnetism
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