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 85
s com-pleted and the corresponding vertical-chain relay is energized. This 68 A U TOM A TIC TELEPHON Y relay places a ground on the corresponding contact in the vertical bank,which contact the vertical wiper will engage when the line wipers standopposite the level which is busy. The vertical bank… … Fig. 65.—Vertical wiper and bank, normal. When the switch is seized, the line relay and release relay operate asusual, grounding the release trunk and preparing the vertical-magnetcircuit. The calling device of the telephone makes the line relay vibrate andthus to cause the vertical magnet to lift…
Telephone
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