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 158
rs as shown inFig. 136. Eight sections of selectors scatter their traffic over the wholenumber, except that connector No. 14 is not yet installed. Connectors1 and 2 are for toll service, although they may be used for local calls aswell. They are called combined toll and local connectors. Thetoll… … Fig 134.—Selector trunking (one level). Sections grouped by 3s and 6s. But when seized by a local selector, it acts like other (regular) connectors. The first eight contacts on the selector banks are slipped. The lasttwo are straight. The tenth contact alone leads to the toll connectors,so that a…
Telephone
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