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 280
will release the connector and supply the busy tone to the callingsubscriber. The ringing relay, R-28, is wired in the usual manner exceptthat its sleeve contact is wired through a resistance r-1 to negative battery,to hold up the cut-off relay while ringing. To Primary Selectorsand First Selectors… … Fig. 223.—Relation between distributors and keyset switches. The frequency selector, S-7, is a flat rotary-type switch. The select-ing wiper is W-S-70 but there are two other wipers, W-S- 700, for thepurpose of restoring the switch to normal, by propelling it around theand W-S-7, which has for its…
Telephone
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