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 160
-4-3-Z 11-3 1—1—1—1—1-1 —|-| 12-0 i—i-i- |-i-1-1-1 u-Q I—I——I—r—t—i—i 14-3 Fig. 136.—Selectors (3d) trunking into 14 switches (scheme). Seventeen connectors may be connected in two ways, of which one isshown in Fig. 138. Twelve sections of selectors are divided into twoparts, six sections each for… … 2 3 4 5 6 7 8 9Number of Contacts Fig. 137.—Selectors (3d) trunking into 14 switches (terminal connections). The first five contacts are slipped in the regular way, and there areno individual trunks. Contacts 6 and 7 are not slipped. There are five toll and regular connectors, numbered 1 to 5. The…
Telephone
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