. The Street railway journal . plications to track work,Air. Annable has developed a complete cast-welding outfit,including a sand blast for cleaning the joint. This equip-ment is mounted on a truck, as shown in Fig. 1, using anold Edison 14-motor belted to an air compressor, and onthe same truck is mounted Clingmans sand mixer. Theapparatus can then be easily hauled to the point of joint is first cleaned by means of the sand blast untilthe bright metal shows for some 12 ins. on each side ofthe joint, then it is also sanded just before the moulds forthe cast weld are placed around it,
. The Street railway journal . plications to track work,Air. Annable has developed a complete cast-welding outfit,including a sand blast for cleaning the joint. This equip-ment is mounted on a truck, as shown in Fig. 1, using anold Edison 14-motor belted to an air compressor, and onthe same truck is mounted Clingmans sand mixer. Theapparatus can then be easily hauled to the point of joint is first cleaned by means of the sand blast untilthe bright metal shows for some 12 ins. on each side ofthe joint, then it is also sanded just before the moulds forthe cast weld are placed around it, so as to eliminate en-tirely any oxide film which may interfere with an integralcontact between the cast metal surrounding the rail andthe steel of the rail itself. The novelty of this cast-weldjoint lies in the fact that the weight of molten metal sur-rounding the joint yields up enough specific heat to reducethe rail surfaces in contact to a temperature which approxi-mates that requisite for melting. In order to produce this. FIG. 3.—CAST WELDED JOINT AND MOLD with a given mass of metal, the weight of the metal mustapproximate 180 lbs. for a 90-lb. rail. Mr. Annable allowsthe metal to pass through the cast-iron mould which sur-rounds the joint, and in this way adds to the temperatureof the joint sufficient heat to produce the metallic unionrequired between the cast joint and the rail. He then re-duces the amount of metal required to stay around the joint November i, 1902.] STREET RAILWAY JOURNAL 761 so only enough is left to make it mechanically as strong asthe rail. One hundred and forty pounds is found ample forthis result. It is found that the passage of this extra metalthrough the mold does not change the chemical compositionat the head of the rail, which is subject to the attrition fromthe blow of the rolling car wheel. The tests on a rail joinedin this way show that it requires 60 tons hydraulic pressure should be made to the use by the Grand Rapids Companyof a corrug
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
