. The Street railway journal . FIG. 1.—SIDE VIEW OF BOND 0000 wires have an area of 423,000 c. m. Thus the ratio of steel atpoint of contact with bond terminal of rail to copper of bond wire to 1. The construction of the bond is clearly shown in the section(Fig. 2). The wires are held between a washer of steel, which isdirectly under the bolt head, and one of copper which is separatedfrom the web only by a thin corrugated plate of copper. The bondis applied by first cleaning the rail, then placing the parts in posi-tion and screwing up the bolt in the way a joint angle plate wouldbe bol
. The Street railway journal . FIG. 1.—SIDE VIEW OF BOND 0000 wires have an area of 423,000 c. m. Thus the ratio of steel atpoint of contact with bond terminal of rail to copper of bond wire to 1. The construction of the bond is clearly shown in the section(Fig. 2). The wires are held between a washer of steel, which isdirectly under the bolt head, and one of copper which is separatedfrom the web only by a thin corrugated plate of copper. The bondis applied by first cleaning the rail, then placing the parts in posi-tion and screwing up the bolt in the way a joint angle plate wouldbe bolted up. The immense pressure thus put upon the bolt crushesout the corrugations of the thin washer, and makes a good union CENTER OP WTth Deckjocnterop\With no Deck . Gravity LOADGravityLoad —IT to to -■—J J. FIG. 3.—DIAGRAM OF DOUBLE DECK CAR FIG. 2.—SECTION OF RAIL WITH BOND course the four elliptic springs and the four springs in the center ofthe truck all aid to resisting oscillation as well as compression, butbeing located nearer the center of the truck they do not act asstrongly as the springs at the ends. In the Extra Long truck fourmore counter springs are added as stated. These four more countersprings add 400 lbs. per % in. compression. The resistance variesdirectly with the distance through which the end of the car bodymoves, but the arrangement of counter springs, actingagainst theupper spiral end springs, is such that not only is the lifting power ofthe truck springs under the rising end of the body entirely elimina- between the parts, and perfect electrical and mechanical which have been buried in the ground for over two years donot show any signs of deterioration, and, in fact, the surface of therail under the bond appears brighter than when the bond was f
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
