Abstract
Abstract In a paper presented before the A.S.M.E., December, 1932, the author developed constants for a new method of figuring horsepower and tractive effort of steam locomotives based on boiler evaporation and number of revolutions of the driving wheels for use in connection with modern locomotives. This method was verified on a number of locomotives, for which it gave accurate results in accordance with test data. In the present paper the author discusses the influence of the size of cylinders and shows that for locomotives with certain proportions between boiler and cylinder dimensions modifications of previously recommended factors are necessary. These modifications are verified for a number of locomotives with comparatively large cylinders. In conclusion he develops a convenient formula based on both boiler evaporation and cylinder dimensions, applicable to all modern locomotives, whether of the longor limited cut-off type (with small or large cylinders).
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