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 80
will be connected straightthrough the selector when the lines are extended. The release relayhelps to control the release-magnet circuit and prepares the impulsingcircuit from the line relay to the vertical magnet. The series relay Se co-operates with the off-normal springs ONS toinitiate the… … Fig. 63.—Circuit of selector switch. The switching relay SwRy switches the lines from the line relay tothe line wipers — W and + W, extends the release trunk to the next switchahead and controls the ground connection of the line relay so as to takecharge of the release of the switch. Normally the…
Telephone
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