The outlines of physics: an elementary text-book (1897)
Nichols, E. L. (Edward Leamington), 1854-1937 · New York, The Macmillan Company; London, Macmillan & Co., Ltd. · leaf 346
at O, and the circuit is closed again.This process goes on indefinitely so long as current isallowed to flow, inter-rupting the currentthrough the primarycoil many times asecond. Each time the cir-cuit closes, a magneticfield is formed whichembraces both the pri-mary and the second-ary coils, and… … Fig. 300.
Physics
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