. The car wheel; giving the results of a series of investigations . INTERPRETATION OF GRAIN STRUCTURE IN SCHOEN WHEEL AT VARYINGDISTANCES BELOW SURFACE OF TREAD. 48. No. 29. i^ In. Bklow Tread. No. jo. ^A In. Below Tre.^d. MICROFHOTOGRAFHS OF TIRE B. 88 DIAMETERS. 49

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