. Electrical world. FIG. 2.— OF BUILDING. who is the head trouble man. At one end of his desk is a small win-dow which opens into the inspectors waiting room, the convenienceof which arrangement is obvious. Near by is the main distributingboard, reached on one side by the cables from the tunnel and on theother by the switch-room cables. It is a board of the most moderndesign, and the terminals are arranged in such a compact way that itis only 10 ft. in height and about 12 ft. in width. It is made in sec-tions, and its ultimate capacity is practically unlimited. The small cab
. Electrical world. FIG. 2.— OF BUILDING. who is the head trouble man. At one end of his desk is a small win-dow which opens into the inspectors waiting room, the convenienceof which arrangement is obvious. Near by is the main distributingboard, reached on one side by the cables from the tunnel and on theother by the switch-room cables. It is a board of the most moderndesign, and the terminals are arranged in such a compact way that itis only 10 ft. in height and about 12 ft. in width. It is made in sec-tions, and its ultimate capacity is practically unlimited. The small cables from this board do not lead directly to the banksof automatic selector switches, but first cross the hall to the tool lineoperating room, where thew are tapped upon the toll room exchangeswitchboard. Again they cross the hall to the switch room and findtheir way to the subscribers selectors. Here are provided five banksor frames of selector switches, or selectors, with 1,000 to each FIG. 3.— riILL LINE OPER.^TING KOO-M. and additional ones known as trunk selectors. The frames are ofheavy angle iron and hardwood. The lower four rows or 100 select-ors, and the upper ones are the trunking selectors. Of course, inthe Grand Rapids exchange, as in any automatic exchange havingmore than 999 telephones and consequently having numbers of fourdigits, two sets of trunking selectors are necessary. There is amplefloor space for at least three more banks of 1,000 selectors, so thatthe exchange has a capacity of 8,000 telephones, and by the removalof some partitions even this could be increased.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
