Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 424
426 ELEMENTARY ELECTRICITY and in such cases the coils are wound with round double-cotton covered wire with few turns per layer, so that thevoltage between the layers is kept within safe limits. Thecore is built up of steel sheets 0.0014 inch thick. In thelarger sizes, space blocks are placed every…
Electricity
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