Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 58
r^^>%& ^^^ … iiiiiiiiii ii i iiiiiiiiiiiii|l|||!l|TTfu*-K--,-M--v-K-v^^JJ bell is switched out of circuit and the transmitter, receiver and impulsesprings are connected across the line. Each time the impulse cam breaks the contact between the impulsesprings, it opens the line for an instant, thus causing one…
Telephone
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