No. 15. In. Below Tread. No. 16. i In. Below Tread. MICROPHOTOGRAPHS OF TIRE A. 88 DIAMETERS. 37 … p3//V, / /A/, INTERPRETATION OF GRAIN STRUCTURE IN TIRE A AT VARYING DISTANCESBELOW SURFACE OF TREAD. 39 tread and at depths of | in., ^ in., and | in. re-spectively. From these the gradually increasing sizeof the grain is apparent, though from its large di-mensions, even at the tread, it would…
Railroad cars
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