Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 336
utilized in induction coils constructed togenerate very high electromotive forces, capable of overcomingthe resistance of the air and causing sparks to pass across airgaps. The induction coil, or Rhumkorff^s inductorium, Fig.284, is a step-up-transformer since, by induction, it raises thevoltage of… … Condenser Fig. 285.—Diagram of Connections of a Spark Coil. around which is wound the cylindrical primary coil, com-posed of several layers of heavy wire, while a secondary coilcomposed of thousands of turns of fine wire, is wound overthe primary, similar to Fig. 283. The inner or primary coilis…
Electricity · Magnetism
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