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 149
thod used by the American Automatic Tele-phone Company is shown in Fig. 124. A, B and C represent threeshelves or groups of first selectors and only five trunks are shown out-going from each shelf. The first trunk is individual, as from shelf Aa single trunk runs to second selector a; from shelf B,… … c\ \ \ \ Fig. 124.—Individual trunks with common group. pled to all the shelves, each trunk ending in a connector, indicated bythe word common. The method of individual trunks used by the Automatic ElectricCompany is shown in Fig. 125. It consists essentially of one or moreindividual trunks and a…
Telephone
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