s subjected. There hasevidently been no work put upon it after the finalheating. This also explains why there is compara-tively little enlargement of the grain going downfrom the surface of the tread. The photograph No,21 was taken at the surface of the tread and the othersfollowed at depths of |… … No. 15. In. Below Tread. No. 16. i In. Below Tread. MICROPHOTOGRAPHS OF TIRE A. 88 DIAMETERS. 37
Railroad cars
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