. Railway master mechanic [microform] . ws the method of making tensile testsof tubes. The test-pieces are short lengths of tubetested whole, that is to say. without flattening out thetube. The ends are first expanded by means of conesA, nuts B with a corresponding taper being previouslyplaced on the outside of the tube; these nuts are then the cast bars of No. 4 bronze which were not appre-ciably affected by testing at the higher was thought that this degree of heat had an anneal-ing effect on the rolled bars, and thus reduce! theirtensile stress; but when bars of the same mate
. Railway master mechanic [microform] . ws the method of making tensile testsof tubes. The test-pieces are short lengths of tubetested whole, that is to say. without flattening out thetube. The ends are first expanded by means of conesA, nuts B with a corresponding taper being previouslyplaced on the outside of the tube; these nuts are then the cast bars of No. 4 bronze which were not appre-ciably affected by testing at the higher was thought that this degree of heat had an anneal-ing effect on the rolled bars, and thus reduce! theirtensile stress; but when bars of the same material wereannealed in oil at 370 deg. Fahr. and afterwards testedcold, practically the same results were obtained asfrom the unannealed bars. The copper in these testswas of ordiiiary commercial quality, containing per cent of pure copper. The bronzes were ofvarious mixtures, which have been analyzed by Archbutt, F. I. C., with the results given inthe preceding column. (To be continued.) A PNEUMATIC BAGGAGE TESTING ROOM—MIDLAND RY. OF screwed into sockets C secured to the testing machine,;nid the ends of the tube are thereby gripped, the conesA being left in to prevent them from collapsing whenthe nuts are screwed up. Figs. 18 and 19 representthe apparatus used for testing locomotive firebox stays,etc., under heat. This consists of a light copper casingA, having a stuffing-box B at either end, through whichpass steel bolts C, secured to the testing machine attheir outer ends, and connected by a screwed couplingby a firebox stay D inside. The casing is filled withmineral oil, having a high flashing point, heated bymeans of a Bunsen burner, and kept in circulation bya perforated stirrer E. Tensile Strength and Elongation of Copper and BronzeFirebox Stays. Cold and Hot. A very clever use of air, as a labor saver, has beenmade on the Grand Rapids & Indiana. Mr. G. , of Cadillac, who is connected with that road,last spring built and applied the
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
