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 113
ich it was reached. But imme-diately a first selector is taken and it supplies talking battery currentto the two telephones. When both of them hang up their receivers, thefirst selector and the lineswitch return to normal. Thus the reverting-call switch is used only long enough to ring the bells—it… … Rises®. j^J^n <-***. 0. N.5 SAMPL E BANK COMBINATIONS: d:~js l^and 33^Bells Across the Line or Both from-Lto Earth75 IGand50^ dells Across the Line or Both from-L to Earth Any Other j^fj tlau Be Hade] 3Rings 50^ Bell on - L and50~Bell e>n+L(Earth)* {4Rings, SO^Bel/on -L and 66^ dell on+L…
Telephone
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