. American telephone practice . 4fr FIG. 162.—CIRCUITS MAGNETO SWITCH-BOARD—SUBSCRIBERSCONVERSING. however, to place approximately io such pairs for each ioo sub-scribers in the system, it being found that this number is sufficientto meet the requirements at the busiest periods of the day. This,of course, provides service permitting one of io per cent, of the sub- MAGNETO SWITCH-BOARD FOR SMALL EXCHANGES. 183 scribers to be engaged in conversation with another 10 per cent, ofthe subscribers at the same time. But a single operators telephoneset is provided for each operator as, by means of the
. American telephone practice . 4fr FIG. 162.—CIRCUITS MAGNETO SWITCH-BOARD—SUBSCRIBERSCONVERSING. however, to place approximately io such pairs for each ioo sub-scribers in the system, it being found that this number is sufficientto meet the requirements at the busiest periods of the day. This,of course, provides service permitting one of io per cent, of the sub- MAGNETO SWITCH-BOARD FOR SMALL EXCHANGES. 183 scribers to be engaged in conversation with another 10 per cent, ofthe subscribers at the same time. But a single operators telephoneset is provided for each operator as, by means of the keys, K, asso-ciated with the various cord circuits she may, at will, connect hertelephone set with any one of the pairs of cords. Likewise, a singlegenerator, G, may serve the entire exchange. The line drops in a board of this type are wound to a resistanceof about 80 ohms, unless designed for multiple or bridged telephonelines, in which case the resistance of the drops is usually made muchhigher, from 500 to 1000 ohms. Th
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Keywords: ., boo, bookcentury1900, bookdecade1900, bookidamericantelepho00mill
