. The Bell System technical journal . Fig. 10—ielephotooraph. Received 10 by 1432 inches with 100 lines per by courtes>- of the Associated Press. 566 SYSTliM TJ-:CHNICAL JOURNAL. A NEW TELEPHOTOGRAPH SYSTEM 567 of the circuit. Since these sudden variations in net loss producenoticeable changes in shade of the received picture, means similar tothose employed with the earlier Bell System telephotograph equipmenthave been made available to prevent these relays from operatingwhile a picture is being transmitted. Simple types of control unitsactuated by signals transmitted
. The Bell System technical journal . Fig. 10—ielephotooraph. Received 10 by 1432 inches with 100 lines per by courtes>- of the Associated Press. 566 SYSTliM TJ-:CHNICAL JOURNAL. A NEW TELEPHOTOGRAPH SYSTEM 567 of the circuit. Since these sudden variations in net loss producenoticeable changes in shade of the received picture, means similar tothose employed with the earlier Bell System telephotograph equipmenthave been made available to prevent these relays from operatingwhile a picture is being transmitted. Simple types of control unitsactuated by signals transmitted over a control circuit are connectedto each regulating repeater associated with the picture circuit. Thiscontrol circuit consists of two one-way d-c. channels obtained bycompositing the telephotograph circuit and extended to each tele-photograph station over simplexcd loop arrangements. The controlcircuit is also arranged to perform other functions such as effectingone-way transmission of the 2-wire circuits during a picture trans-mission. The operation of the control circuit normally is performedautomatically at the sending telephotograph station. Inasmuch as the transmission requirements for th
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
