. The Street railway journal . GRINDER FOR SMOOTHING JOINT three men being able to weld from twelve to fourteen joints in thislength of time. Where the time between cars was 10 minutes orover the work was done in the daytime, as the joints can easily bemade while the cars are running without interfering with the total number of joints made, three (or less than 1 per cent)were imperfect, and had to be repoured. No breaks have yet oc-curred. The cost of joints on 9-in. rail made this year has been$, divided as follows: Thermit $ Labor ■ 50 Molds 20 Crucibles, per joint 25 Inci
. The Street railway journal . GRINDER FOR SMOOTHING JOINT three men being able to weld from twelve to fourteen joints in thislength of time. Where the time between cars was 10 minutes orover the work was done in the daytime, as the joints can easily bemade while the cars are running without interfering with the total number of joints made, three (or less than 1 per cent)were imperfect, and had to be repoured. No breaks have yet oc-curred. The cost of joints on 9-in. rail made this year has been$, divided as follows: Thermit $ Labor ■ 50 Molds 20 Crucibles, per joint 25 Incidentals 05 Total $ Data on the other sections of rails are not yet available, as thework is not yet completed, but as the charges for labor, molds, etc.,remain practically constant, irrespective of the section of rail, it. TRACK AFTER WELDING will be safe to say that the cost of joints will lay between $ for\Y\-\w. 60-lb. T-rail, and $ for 9-in. 107-lb. grooved rail, thesefigures being based on present quotations for thermit. To thismust be added $ per joint for removing and replacing pave-ment when welding rails already of the joint with a Conant bond tester which compares the resistance of 3 ft. of rail with a joint with that of 3 ft. of railwithout a joint, show the conductivity of the joint to be practicallyequal to that of an equal length of rail. Tests of individual jointsby determining the drop in voltage at the joints confirm these re-sults. Tests of the joints made last year show no deterioration inconductivity. Mechanically the joint seems to be perfect. Thefollowing test will give an idea of the strength of the joint: Asection of 9 in. 107-lb. rail 13 ft. in length, with the joint in themiddle, was placed in the track on two ties, distance center tocenter of bearing 12
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
