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 275
ir. The A operator will press 252 A U TO MA TIC TELEPHON Y the office button which corresponds to the order-wire button used oncalls to other manual offices. This will cause a trunk indicator to displaythe number of the trunk to be used, into which the operator will insertthe calling plug of the… … Fig. 220.—Cordless B board. If the traffic to automatic is small, or the manual office under con-sideration is soon to be changed to automatic, the A operators willnot do the calling, but it will be done by B operators located at acordless B board in the automatic office (Fig. 220). The call…
Telephone
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
