. The street railway review . he cost of joints on g-in. rail made tliis year has been$, divided as follows; Thermit $ Labor 50 Molds 20 Crucibles, per joint 25 Incidentals 05 Total $5-25 Data on the other sections of rails are not yet available, as tlrjwork is not yet completed, but as the charges for labor, molds, practically constant, irrespective of the section of rail, itwill be safe to say that tlie cost of joints will lay betw-een $ for4%-in. 6o-1b. T rail, and $ for g-in. 107-Ib. grooved rail, thesjfigures being based on present quotations for thermit. To th
. The street railway review . he cost of joints on g-in. rail made tliis year has been$, divided as follows; Thermit $ Labor 50 Molds 20 Crucibles, per joint 25 Incidentals 05 Total $5-25 Data on the other sections of rails are not yet available, as tlrjwork is not yet completed, but as the charges for labor, molds, practically constant, irrespective of the section of rail, itwill be safe to say that tlie cost of joints will lay betw-een $ for4%-in. 6o-1b. T rail, and $ for g-in. 107-Ib. grooved rail, thesjfigures being based on present quotations for thermit. To this mustbe added $ per joint for removing and replacing pavement whenwelding rails already laid. Tests of the joint with a Conant bond tester which compares theresistance of three feet of rail with a joint with that of three feetof rail without a joint, shows the conductivity of the joint to equal to that of an equal length of rail. Tests of in-dividual joints by determining the drop in voltage at the joints. TR.\CK .\FrER WELDIXr, confirm these results. Tests of the joints made last year show nodeterioration in conductivity. Mechanically the joint seems to b,-perfect. The following test will give an idea of the strength ofthe joint: A section of 9-in. 107-lb. rail 13 ft. in length, with thejoint in the middle, was placed in the track on two ties, distancecenter to center of bearing 12 ft. 6 in., and loaded double truck cars weighing about 20 tons allowed to pass over it. Tlic railcracked through the bolt holes, but no harm was done to the fact that we did not have a single break during the pastwinter shows pretty conclusively that the joint is, when properlymade, sufficiently strong to withstand all stresses due to changes intemperature and those due to traffic. Joints sawed through themiddle show that perfect amalgamation of the metals has takenplace. IS3[6L!I^-1^9llfl J liBHB W 1^ ^ ^■: 1. 11^ IM (.KINDER FOR SMOOTHINf, JOINT From what experienc
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
