. The car wheel; giving the results of a series of investigations . No. 6i. Slag ^s In. Bei o\v Shei lkd-outSroT No. 62. Slag ^ In. Below Shelled outSpot. No 63. Structure yi, In. Below Tread. No. 64. Structure % In. Below Tread. MICROPHOTOGRAPHS OF SHELLED-OUT WHEEL F. 50 DIAMETERS. 71

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