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 313
he slow-acting relay B, to therelease trunk so soon as the armature of B falls back. Since the circuitthrough B is not broken, however, until the armature of the slow-actingrelay A falls back, B does not complete the circuit to the release trunkuntil the selector switches have had time to release… … Dist Frame ,§ ■■Through of her Vjsuals to Ground Res. Coil Fig. 245.—An overflow trunk from a toll switchboard to an automatic switchboard. Since the circuits, of chief operators and monitors desks, throughswitching toll cord circuits, toll test panels, etc., may be the same as anyefficient…
Telephone
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
