. The car wheel; giving the results of a series of investigations . 15. V2 In. Below Tread. No. i6. i In. Below Tread. MICROPHOTOGRAPHS OF TIRE A. 88 0s/A/. / /A/, INTERPRETATION OF GRAIN STRUCTURE IN TIRE A AT VARYING DISTANCESBELOW SURFACE OF TREAD. 39 tread and at depths of | in., J 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 appear that thisparticular tire v^as finished at a high temperature. The microphotographs of the Schoen wheel showthat for the first J in. of
. The car wheel; giving the results of a series of investigations . 15. V2 In. Below Tread. No. i6. i In. Below Tread. MICROPHOTOGRAPHS OF TIRE A. 88 0s/A/. / /A/, INTERPRETATION OF GRAIN STRUCTURE IN TIRE A AT VARYING DISTANCESBELOW SURFACE OF TREAD. 39 tread and at depths of | in., J 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 appear that thisparticular tire v^as finished at a high temperature. The microphotographs of the Schoen wheel showthat for the first J in. of depth it has the fineststructure of any of the wheels and tires examined,but below this depth its grain increases in size in acomparatively uniform manner, though with a varia-tion to be noted later. The steel contains but a traceof ferrite, indicating that the carbon content is aboutthe same as that in the A tire. Here again, owingto the absence of sufficient ferrite to outline the grainclearly, it was necessary to photograph by obliqueillumination, and it was under this light that the ac-companying sketches to show the grains size weremade. The micropho
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Keywords: ., bookcentury1900, bookdecade1900, bookidc, booksubjectrailroadcars
