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 86
US 69 ment, the interrupter relay is de-energized and the vertical motion ceases.Following this the wipers are moved onto the first trunk of theselected level. As long as the private wiper finds grounded contacts, the mutualvibration of the rotary magnet and the interrupter relay will… … Fig. 66.—Vortical wiper and bank, operated. The next switch ahead soon grounds the release trunk, so that whenthe line relay and release relay of this selector fall back, the switchingrelay will be held energized. If there is a free trunk in the first level of the group, the rotary actionstarts at…
Telephone
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