. Western electrician . thecase. Before I relate briefly the line of that simplification Iwould like to remind you that we are dealing with a com-paratively early period of the telephone industry—not tooearly to appreciate the advantages of metallic circuit lines,as contemporary records show, but a time when the com-mercial side of the telephone exchange business practicallysettled the nature of the lines to be run, so that single lineswere the rule. It is possible that some may be surprised tohear that metallic circuit multiple boards are ]3rovided for inScribners 1S79 patent, the necessary m
. Western electrician . thecase. Before I relate briefly the line of that simplification Iwould like to remind you that we are dealing with a com-paratively early period of the telephone industry—not tooearly to appreciate the advantages of metallic circuit lines,as contemporary records show, but a time when the com-mercial side of the telephone exchange business practicallysettled the nature of the lines to be run, so that single lineswere the rule. It is possible that some may be surprised tohear that metallic circuit multiple boards are ]3rovided for inScribners 1S79 patent, the necessary modifications to theapparatus being clearly described so as to adapt them tometallic circuit use; the plan would not be considered satis-factory now, as only one side of the indicator is cut any rate, switchboards were required to be developedfor single lines, and this enabled a simplification to be pro-ceeded with. The separate test line gave way to a much>re simple contrivance, which was communicated by FIG. 4. THREE-PHASE WIRING AND LIGHTING FIXTURES IN CONCORD, N. H.—DOME LIGHJ ING IN COURT-ROOM. (it was on the Law system and easily done). The sub-scribers* numbers were inscribed on a signal-board placedin a central position. These numbers could be obscuredby shutters. When asubscriber was put through, the oper-ator would instruct the attendant at the signal-board toobstruct the number. On disconnecting, the reverse in-struction would be given. Before connecting a line, theoperator would look at the signal-board to see if the sub-scriber required were disengaged. This method was crude,but none the less deserves commendation as an attempt toovercome the difficulties which were becoming apparent. Itis a multiple board without a test system. I cannot claimit as a link in the chain because, as a matter of fact, the so-lution of the problem had already been [in the Patent Ofiicefor over a year. It is in the specification to which I havealready called attention
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