. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . Fig. 217. :: .■ ^ »«i>n -ft&Sl BgjSSjjIffi w/^^^^ -^^ShB^s iS? ^^mibI ^^ Fig. 218. THE SYSTEM OF THE WESTERN ELECTRIC 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, regardless of their destination. All alike are recorded on asender. If the called number is in
. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . Fig. 217. :: .■ ^ »«i>n -ft&Sl BgjSSjjIffi w/^^^^ -^^ShB^s iS? ^^mibI ^^ Fig. 218. THE SYSTEM OF THE WESTERN ELECTRIC 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, regardless of their destination. All alike are recorded on asender. If the called number is in a manual office (as NORth office inFig. 4), it will be switched to a trunk which terminates in a plug on the. 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 appearance of a manual position equipped with a call indicator isshown in Fig. 218. The dark rectangle lying between the edge of theshelf and the row of keys is the indicator. Manual to Automatic—If the traffic to automatic offices from themanual office under consideration is large, the latter will use push-buttoncalling devices which will be operated by the A operators (Fig. 219),marked Numerical keys. A call from a subscriber will be answeredas usual with the answering plug of a pair. The A operator will press 252 A U TO MA TIC TELEPHON Y the office button which corresponds to the order-wire button used oncalls to other manual offices. This will cause a trunk indicator to displaythe number of the trunk to be used, into which
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttelephone, bookyear19
