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 351
auto- 325 326 A UTOMA TIC TELEPHONY matic service is inaugurated, and be instructed in the use of the dial,so that after the hour on which he is informed that the cut-over is totake place he will understand that he is to use the calling device for secur-ing his connections and will be in possession… … Fig. 275.—A lineswitch unit (100 lines) with toothpicks in the line and cut-off relays,tied together ready to be pulled out at the cut-over signal. cutting the lines of inserting similar insulators in the manual centraloffice. The circuit of the individual master switches are temporarilyopened, the…
Telephone
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