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 327
rfere with operations betweenB and A, and as soon as that section of the line is clear the visual at Coperates. At the same time the through-switching relay at B operates, cuttingoff both of the taps at B, switching both sides of the line straight throughto A, and bridging out Bs calling-device key… … LONG DISTANCE AND SUBURBAN EQUIPMENT 303 of considerable length, that a transmission loss in the through circuit canbe eliminated by installing the through-switching relay and repeatingcoil at B on the pole where the cable connects to the through line. When Cs visual signal indicates that the line…
Telephone
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