depth of J in. and the otherI in. below the surface of the tread. This is bestillustrated by the accompanying diagram of themicrostructure in the Schoen wheel, in which thefour strips and the location of the microphotographsare roughly indicated. Strip No. I shows a very fine grain at the… … No. 19. % In. Below Tread. No. 20. i In. Below Tread, MICROPHOTOGRAPHS OF WHEEL E. 88 DIAMETERS. of the flange. The first ^ in. is formed of a veryfine mixture of about equal proportions of ferriteand pearlite, and below this the ferrite gradually dis-appears and the grains increase in size. At a…
Railroad cars
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