Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 105
will be switched into or out of the propercircuit relation with the line, and the receiver, transmitter and bat-tery at each end. Throwing any switch will connect both primaryand secondary coils simultaneously. When all of the switches arein their normal positions, the coil connected at the end of…
Telephone
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