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 339
coils are usually ratedSSS^^^SS^S&S according to the number of inchesFig. 290.—Sectional Winding of that the spark will jump between the secondary of a bpark Coil. ,-, \ , . -i ,i i the secondary terminals throughthe air. Thus a two inch coil means that the E. M. F, ishigh enough to cause… … THE INDUCTION COIL, 321 in medical coils. The primary must be thoroughly insulatedfrom the secondary, and also the coils of the secondary fromeach other when it is wound in sections. With insufficientinsulation the induced E. M. F. is liable to cause a spark topass from the secondary to the…
Electricity · Magnetism
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