Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 374
y, of Missouri, in their St. Louisexchange. This board consists of 19 sections, with three operatorspositions at each section. It is finished in mahogany, and is aboutsix feet high, four feet wide, with an over-all length of nearly 115feet. It is at present wired for 4800 lines, and is capable of… … the switch-board 260 answering jacks and lamps, representing theset of subscribers lines over which the three operators at that sec-tion receive their calls. Between the answering jacks and the mul- THE COMMON BATTERY MULTIPLE SWITCH-BOARD. 363 tiple jacks are placed the outgoing trunk jacks,…
Telephone
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