St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 117
rgely used by telephone companiesfor charging storage batteries, and for transforming fromdiredt to alternating current, for ringing telephone bells.Eletftro-cautery, eledtroplating, and eledlric heating alsogive use to dynamotors. CHAPTER XIX. HOW ELECTRIC CURRENTS ARE DISTRIBT7TED FORUSE. 138.… … room to another, conduSlors must be used. To keep thecurrent from passing into the earth before it reaches itsdestination insulators must be used. The form of condudt-ors and insulators used will depend upon the current and
Electricity
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