. American telephone practice . FIG. 391.—STRIP OF TWENTY LINE AND CUT-OFF RELAYS minals so connected that all wiring is open and ready for inspection,the use of cable being very largely eliminated. The Kellogg Company is also manufacturing a somewhat cheaperand more compact relay, which it terms its minor relay, whichembraces the same mode of operation as its major type of relay justdescribed, but embodies some very unique features in point of con-struction. These relays are of the tubular type, but the method of construc-tion differs radically from that of the ordinary tubular relay, for asi
. American telephone practice . FIG. 391.—STRIP OF TWENTY LINE AND CUT-OFF RELAYS minals so connected that all wiring is open and ready for inspection,the use of cable being very largely eliminated. The Kellogg Company is also manufacturing a somewhat cheaperand more compact relay, which it terms its minor relay, whichembraces the same mode of operation as its major type of relay justdescribed, but embodies some very unique features in point of con-struction. These relays are of the tubular type, but the method of construc-tion differs radically from that of the ordinary tubular relay, for asingle iron casting is drilled out to take the place of ten tubularshells. The various contact springs are arranged directly on topof this iron casting, being secured thereto by screws passingthrough rubber bushings and blocks for the purpose of insulating MULTIPLE SWITCH-BOARD APPARATUS. 541. w*
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Keywords: ., boo, bookcentury1900, bookdecade1900, bookidamericantelepho00mill
