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 335
le ofthe transformer is 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,… … Fig. 284.—Induction or Spaik Coil.For use with direct currents. THE INDUCTION COIL. 317 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 w^ound overthe primary, similar to Fig. 283..…
Electricity · Magnetism
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