. The Bell System technical journal . as NewYork and Chicago, while the latter, a general view of which is shown inFig. 6, is^used in smaller cities such as Pittsburgh and Kansas City. *A Transmission System for Teletypewriter Exchange Service, R. E. Pierceand E. W. Bemis, this issue of the Bell System Technical Journal, and ElectricalEngineering, v. 55, September 1936, pp. 961-70. TELETYPEWRITER EXCHANGE SYSTEM 507 Fundamentally, a manual switchboard consists of two parts: the(tMininations for subscribers lines and inter-toll trunks, and the switch-iiii; facilities used by the operators in in
. The Bell System technical journal . as NewYork and Chicago, while the latter, a general view of which is shown inFig. 6, is^used in smaller cities such as Pittsburgh and Kansas City. *A Transmission System for Teletypewriter Exchange Service, R. E. Pierceand E. W. Bemis, this issue of the Bell System Technical Journal, and ElectricalEngineering, v. 55, September 1936, pp. 961-70. TELETYPEWRITER EXCHANGE SYSTEM 507 Fundamentally, a manual switchboard consists of two parts: the(tMininations for subscribers lines and inter-toll trunks, and the switch-iiii; facilities used by the operators in interconnecting^ the lines andtrunks. The line and trunk terminations are in the form of multiplejacks and lamps located in the jack field and are accessible to alloperators. The switching facilities, or cords, together with the meansfor communication to subscribers or other operators, are individual toeach operator and are, in general, located at the keyshelf. Althoughthe design of the switching equipment and the multiple are to some. Fig. 1—No. 1 Teletypewriter Switchboard at New York, N. Y. extent dependent upon each other, the principal factors influencingthe design are, for the purpose of discussion, considered independently. The No. 1 Teletypewriter Switchboard Position EquipmentNo. 1 Teletypewriter Switchboard position consists essen- tially of a teletypewriter for the operators use in sending and receivingthe instructions for establishing the connections, together with anumber of cords for making the various interconnections between theline terminations. The number of these cords necessary for theefficient functioning of an operator is the most important factorgoverning the width of the position, a primary consideration in thedesign of a switchboard. 508 BELL SYSTEM TECHNICAL JOURNAL The number of cords per operator is dependent on the average timerequired to set up and disconnect each call (known as the averagework time per call) and the average communication time per
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