Canadian engineer . used. The switchrods are insulated and the switch tie plates cut so as to 290 THE CANADIAN ENGINEER Volume 22. leave a space of not less than two inches between the ends,as experience, covering- a period of several years, demon-strated that the strength of a continuous plate between tworails is not xequired; also, the cut plate is much cheaperboth in first cost and maintenance and can be inspected forinsulation without diffictilty. The operating- switchboard, the circuits of which areshown in Fig-. 3, contain the main protection used for theinterlocking apparatus. The power
Canadian engineer . used. The switchrods are insulated and the switch tie plates cut so as to 290 THE CANADIAN ENGINEER Volume 22. leave a space of not less than two inches between the ends,as experience, covering- a period of several years, demon-strated that the strength of a continuous plate between tworails is not xequired; also, the cut plate is much cheaperboth in first cost and maintenance and can be inspected forinsulation without diffictilty. The operating- switchboard, the circuits of which areshown in Fig-. 3, contain the main protection used for theinterlocking apparatus. The power wires from the main .power switchboard passthrough this board to the interlocking- machine. Theammeter is inserted in the positive wire. By means of thisammeter the leverman may watch the current used to oper-ate the switches and sig-nals, and can tell whether they areworking properly. At Lake and Clinton Streets, several ammeters are placedon the turret of the interlocking: machine. C/^cc/r /i>/? Two Co/^AfOAts. Fig. 3.—Circuits-Operating Board The track circuits for the interlocking plants are fed by?means of loops from 20-volt storage batteries located in thetowers. Two positive and two negative wires are run fromthe low voltage distributing board to the junction boxes inthe section of the plant to be fed. The wires of the samepolarity are joined at the end, thus forming loops so thatcurrent from the switchboard has two paths to any point onthe loop. The loop wires can break at any place, and everypoint would still receive current. On the switchboard, ammeter jacks are placed for eachwire and again for the main feed wires after the loop wireshave joined. A regulating rheostat is inserted in the posi-tive lead capable of cutting the battery down to about 12volts, at which point it is generally maintained. The tracksections are fed from various points on the loop through re-sistance units placed on each side. These are in most ohms, although on some sections th
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishertoron, bookyear1893
