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 385
e magnetsof all switches draw a heavy current momentarily; the same is true oflineswitches and master switches. To give an indication, should thecurrent flow last too long, a system of release-signal supervision andground-battery supervision is employed. It involves a dash-pot relaywhich is slow to… … SolenoidRinglnt No. 1 Fig. 288.—Solenoid ringing interrupter circuit. only the pilot lamp and the shelf leads. Two leads are carried along toall the boards, the tell-tale wire and the wire for the time-limit apparatuson the first board only. When a selector releases, its release magnet draws…
Telephone
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