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 336
Co-ndenser Fig. 285.—Diagram of Connections of a Spark Coil. … Fig. 286.^Students Induction Coil as aSpark Coil. 285. The current from the battery flows through the soft ironpivoted armature. A, free to move, to the stationary contactpost, C, the armature being held in contact with the point, C,by the spring, S. From C the current circulates around theprimary…
Electricity · Magnetism
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