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 J… … 15. V2 In. Below Tread. No. i6. i In. Below Tread. MICROPHOTOGRAPHS OF TIRE A. 88 DIAMETERS.
Railroad cars
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