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 183
nherent nature of manual telephony. The P.B.X. opera-tor, in many cases, became a sort of secretary to the manager. So deep-rooted is this condition that it has become the standardpractise when installing a private automatic exchange to equip the desksof important officials with manual telephones,… … CD ■ sogZ^4„E CutOutKey Fig. 159.—Secretary service (circuit). to be the almost unvarying sequel, that before long each official demandsthat his manual telephone be replaced with an automatic telephone.Thereafter he dials many calls himself, reserving for the secretary thosecases in which the…
Telephone
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