. The car wheel; giving the results of a series of investigations . No. 53. Slag Crack Near Edge in No. 54. Slag % In. BiiLuw 1 kiiad in Solid Metal. Solid Metal. MICROPHOTOGRAPHS OF SHELLED-OUT TIRE D. 50 DIAMETERS. 67. No. 59. Structure at Edge of Tread. No. 60. Slag at Center of Tread. MICROPHOTOGRAPHS OF SHELLED-OUT WHEEL E. 50 DIAMETERS. 69

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