. The car wheel; giving the results of a series of investigations . ^^i^ ■^f^\ No. 6j. Structure % In. Below Tread. No. 64. Structure % In. Below Tread. MICROPHOTOGRAPHS OF SHELLED-OUT WHEEL F. 50 No, 69. No, 70, MICROPHOTOGRAPHS OF BURNED METAL OF SCHOEN STEEL DIAMETERS,

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