The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 250
COMMON B4TTERY MULTIPLE SWITCH-BOARDS 225 … 1 Pilot /~\PIL0T -O o_ o PILOT 1 z? ! 5 *- If) Q 22<< ^ ORDERWIRE instruction Register ME OperatorsInst: Jacks looooSupervisors^Inst:Jack ElevationFig. 247.—Scale $ 226 PRACTICAL TELEPHONE HANDBOOK board, it is thought advisable to describe briefly the leadingfeatures of the Barnsbury or…
Telephone
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