. The Bell System technical journal . Fig. 17—Installation of step-by-step dial equipment showing selectors mounted on iron framework. 24 BELL SYSTEM TECHNICAL JOURNAL Panel Dial System In the largest cities and the smaller municipalities around themmaking up the large metropolitan centers, a much greater degree ofcomplexity is encountered in switching the calls due to the largenumber of offices of varying types to which calls are destined and due. Fig. 18—Typical panel selector frame. Capacity 30 selectors in front and 30selectors in rear. Motor driving mechanism is at the bottom of frame and
. The Bell System technical journal . Fig. 17—Installation of step-by-step dial equipment showing selectors mounted on iron framework. 24 BELL SYSTEM TECHNICAL JOURNAL Panel Dial System In the largest cities and the smaller municipalities around themmaking up the large metropolitan centers, a much greater degree ofcomplexity is encountered in switching the calls due to the largenumber of offices of varying types to which calls are destined and due. Fig. 18—Typical panel selector frame. Capacity 30 selectors in front and 30selectors in rear. Motor driving mechanism is at the bottom of frame and controllincapparatus at either side. TELEPHONE SYSTEM OF THE UNITED STATES 25
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
