to a maximumcoarseness at c2, with another change to extremefineness at /3, at a depth of about J in. Beyondthis point the grain increases uniformly until thenormal size is reached at a depth of i in., as indi-cated by photograph No. 36, and the diagram ofgrain sizes. These changes in grain size… … ELOw Tread No 24. I In. Below Trea No. 25. lYs In. Below Tread. No. 26. 2% In. Below Tread. MICROPHOTOGRAPHS OF WHEEL F. 88 DIAMETERS. 45 by a study of the physical and chemical tests. It isapparent that the Schoen wheel is quite equal tothe best tires, as regards depth of finish and thefineness of…
Railroad cars
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