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 339
these coils.Spark coils are usually rated according to the number of inchesFig. 290.-Sectional Winding of that the spark will iump betweenthe Secondary of a Spark Coil. ,, S x • i ji ^ the secondary termmals through the air. Thus a two inch coil means that the E. M. F. ishigh enough to cause sparks… … THE INDUCTION COIL. 321 in medical coils. The primaiy must be thoroughly insulatedfrom the secondaiy, 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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