Abstract
The paper describes two series of experiments which were designed to investigate the relationship between the surface texture of ground mild steel surfaces and the resistance to rolling of hard steel rollers on these surfaces. In the first series of experiments the rollers were unloaded whilst in the second series of tests the rollers were subjected to a load range of 15-80 lb. In both cases it was found that the coefficient of rolling resistance increased with increasing roughness of the surface. By extrapolation of the results from the second series of tests, agreement with the results of the first series was obtained. The coefficient of rolling resistance was found to decrease with increasing load. The variation of the coefficient of rolling resistance with load is obtained in the form of an experimental law which is compared with the various theories of the mechanism of rolling resistance.
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