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 328
n Cs visual signal indicates that the line is clear, she operatesher calling device in the usual way and the Morse relay at A operates theautomatic switches as already described. Whenever C or B calls automatically into A, the automatic cut-offrelay at A operates, due to the grounding of the… … High lOtY Fig. 257.—Quadruplex dialing on toll lines. On leaky lines better operation can be secured following telegraphpractice by installing a battery at the sending end of the line and con-necting the Morse relay at the receiving end to earth. With this arrange-ment a leak on the line will shut…
Telephone
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