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 326
l adjusting of impulses due to line leakages is readilytaken care of by the switchboard attendant at A, by adjusting the Morserelay to suit the amount of leakage on the line at the time. When C wishes to call a party at A, she throws her calling-device keyand if the line from B to A is not busy, Cs… … Fig. 255.—Simplex controlling circuit. 1. If B is calling A, the simplex tie at B will be open at Bs calling key. 2. If A has called B, or if B has called A manually, so that there is aplug inserted in the line jack at A, the ring of the jack will be connectedto earth through the third conductor of…
Telephone
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