St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 102
urse, a receiver and transmitter areconnedled at each end, together with bells, etc., forsignaling. 124. Induction Coils in Telephone Work. As theresistance of long telephone lines is great, a high elecftric-al pressure, or E.M.F., is desired. While the currentfrom one or two cells is sufficient to… … Fig. 134- lOO HOW THU TELEPHONE TRANSMITS SPEECH.
Electricity
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