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 274
IC COMPANY 251 A general view of selector frames installed is shown in Fig. 216. Thecabling is carried overhead on runways. No attempt is made to coverany part of the mechanism except the relays. CONNECTIONS TO MANUAL Automatic to Manual.—Automatic subscribers dial complete numbersfor all calls,… … Fig. 219.—Manual position with push-button calling device. B operators position. Associated with that position is a callindicator on which the last four digits of the call number are displayedby lamps. (See Fig. 217.) The number here illustrated is 04259.The appearance of a manual position equipped…
Telephone
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