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 26
presented, theothers are easily imagined. The first function of the selector (to select the level) must be com-pletely under the control of the subscriber. The second (to hunt anidle trunk) should be completely self-acting, for it is of no interest to thesubscriber which trunk or connector he gets.… … 10-Selectors per Group10-Connectors, per Group One Level of Switch BanksSymbol Meaning Wiper .Bank Bank Bank WiperFig. 10.—Thousand-line system. idle selector. He then pulls 8 on his calling device, in response towhich the selector lifts its wipers to the eighth level. Then, in a verybrief time,…
Telephone
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