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 282
placesnegative battery on wire 45, leading to the key-set switch bank (Fig. 225)contact *S-84, which is the individual contact in a certain vertical row, andis for the purpose of stopping the wiper of the secondary selector at theproper trunk. The control relay also connects ground from the… … S5First Selector trot Relay Ui,i,u F* Vert Mag. Rot.Mag.
Telephone
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