. The Bell System technical journal . Fig. 16—-Typical step-by-step selector showing relays which control the circuit opera-tion mounted at the top, and the selector banks of 100 terminals at the 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 ar
. The Bell System technical journal . Fig. 16—-Typical step-by-step selector showing relays which control the circuit opera-tion mounted at the top, and the selector banks of 100 terminals at the 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
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
