St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 86
turns of wire there are HOW THE INDUCTION COIIv WORKS. 83 in the two coils. (See Transformers.) Tlie secondarycurrent is an alternating one; that is, it flows in onediredtion for an instant and then immediately reverses itsdiredlion. The rapidity of the alternations depends uponthe speed of the… … 106. Uses of Induction Coils. Gas-jets can belighted at a distance with the spark from a coil, by ex-tending wires from the secondary coil to the jet. Powdercan be iired at a distance, and other things performed,when a high voltage current is needed. Its use in medi-cine has been noted. It is…
Electricity
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