. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . Fia. 204. —Standard Drop Testing Machine, as adopted by Committee of Rail Manufacturers of the United States, April 8, by Committee on Rail of the American Railway Engineering Association at Meeting of June 26, by the Association, Vol. 10, Pt. 1,1909, pp. 369-373, 375,395, 396; Vol. 11, Pt. 1,1910, pp. 240, 252, Steel Rails. STRENGTH OF THE RAIL 291 A diagram showing graphically the relation between results of tests asbet
. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . Fia. 204. —Standard Drop Testing Machine, as adopted by Committee of Rail Manufacturers of the United States, April 8, by Committee on Rail of the American Railway Engineering Association at Meeting of June 26, by the Association, Vol. 10, Pt. 1,1909, pp. 369-373, 375,395, 396; Vol. 11, Pt. 1,1910, pp. 240, 252, Steel Rails. STRENGTH OF THE RAIL 291 A diagram showing graphically the relation between results of tests asbetween the old and new methods, furnished by Mr. Thomas H. Johnson,is given in Fig. 205. These tests were made on rails of the same grade of steel, viz., carbon,about .50, and manganese, .90 to All of the tests were made with a. Fig. 205. — Diagram of Tests with Drop-Testing Machines of Old and New Design. (Johnson.) 2000-pound tup, with a radius of striking face 5 inches, and span betweencenters of supports 3 feet. Table LXXI gives the result of these tests. Since 1908 a number of machines of this design have been installed atvarious mills with satisfactory results. The introduction of a standard drop-testing machine has been of such benefit to the manufacturers and consumersof this country that the International Association for Testing Materials has pub-lished a description and cuts of the American Standard drop-testing machine inFrench, German, and English.* The seventh London Resolution of the Councilwas as follows: That a standard drop-testing machine for rails be adopted in each country, as has already-been done in the United States, in order to make tests comparative. * Proceedings, Vol. 11, No. 4, May 20, 1911, p. 237. 292 STEEL RAILS If we consider what occurs in dealing the blow on the rail with t
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