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 330
jo Composite m Rmger CRr4M hc.R.^i Fig. 258.—Toll line with composite dialing. circuit from LR-1 over one line wire to LR-2, and another from LR-3 toLR-4. Each may be used separately without regard to the other. Figure 259 shows the composite arranged to be called either manuallyor automatically.… … Fig. 259.—Composite dialing circuits. apparatus. At the left center are the selector banks by means of whichthe toll line can be called automatically. This is used if this is a tollswitching office as described under the head Toll Switching Office.In the upper right-hand corner is the toll line…
Telephone
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