. The Street railway journal . FIG. 5.—ARMATURE REMOVED spection, cleaning and repair. The armature may be removedfrom the motor by loosening four bolts, or it may be retained inthe upi)er half of the field and the lower half of the frame maybe unhinged from the upper half. The motor frame is two pieces of soft cast steel, fitted logetherwith a carefully made inachined joint to obtain low resistance. FIG, 6.—DETAILS OF BRUSH HOLDERS for the magnetic lines, as well as to secure a water-tight pole pieces (Fig. 4) are made up of low-carbon sheet steelpunchings riveted together. Each ijo
. The Street railway journal . FIG. 5.—ARMATURE REMOVED spection, cleaning and repair. The armature may be removedfrom the motor by loosening four bolts, or it may be retained inthe upi)er half of the field and the lower half of the frame maybe unhinged from the upper half. The motor frame is two pieces of soft cast steel, fitted logetherwith a carefully made inachined joint to obtain low resistance. FIG, 6.—DETAILS OF BRUSH HOLDERS for the magnetic lines, as well as to secure a water-tight pole pieces (Fig. 4) are made up of low-carbon sheet steelpunchings riveted together. Each ijole piece, as illustrated, isfitted with two ventilating places which corresjiond, in position,with the air spaces in the armature core, to be descriljcd later, sothat the air, when foiced out of the .armature, passes through thecenter of the core and is made to spread over thecold (jf the motor casing. In this way, it is claimed, amuch cooler running machine is obtained than in the old method,where the circulation of air was stopped by solid pole pieces. Thefield coils themsehes are of copper wire insulated with asbestospaper and cotton covering. The completed coil is waterproofed. Fig. 5 shows the finished armature, which weighs, complete, 484lbs. The armature core discs are stamped with forty-one slotsin their edges and five ^entilating holes around the shaft. Half-
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
