St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 113
Fig. 150. Fig. 151. with a solid iron core, on which are wound two coils, theone, P, being the primary, and the other, S, the secondary.Fig. 151 shows the general appearance of one make oftransformer. The operation of this apparatus, as alreadymentioned, is to reduce the high pressure…
Electricity
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