he “A” board controls seven THE COMMON-BATTERY TELEPHONE SYSTEM OF THE vertical panels of the multiple switchboard, which CITY OF NEW YORK. Perhaps a few electrical engineers fully appreciate panels are each sub-divided into small sections re- ceiving one hundred sockets or “jacks,” numbered the… … The system which has thus discarded the mag- is alight. It is the purpose of the pilot-lamp to serve as an addi- neto-generator and the station-battery is technically known as the “common- tional means of attracting the oper- ator’s attention to her subscribers’ battery system,” for the reason that…
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