. Transactions. e, the finding of which prompted this paper. These swirls, oreddies, if such a term can be applied, occur in all parts of the runnerand in all parts of the individual grains. The upper left-hand figureshows this ferrite at a grain boundary; the middle left-hand figure showsthe inner portion of a grain; and the lower left-hand figure shows theseswirls at the edge of a grain which is also the outer edge of the runner. Straight-lined ferrite associated with swirls is found in the areas ofFigs. 11 and 12. The texture of the carbon-bearing constituent of therunner is shown to some e


. Transactions. e, the finding of which prompted this paper. These swirls, oreddies, if such a term can be applied, occur in all parts of the runnerand in all parts of the individual grains. The upper left-hand figureshows this ferrite at a grain boundary; the middle left-hand figure showsthe inner portion of a grain; and the lower left-hand figure shows theseswirls at the edge of a grain which is also the outer edge of the runner. Straight-lined ferrite associated with swirls is found in the areas ofFigs. 11 and 12. The texture of the carbon-bearing constituent of therunner is shown to some extent in Fig. 12, the pearHte being very fineor sorbitic. Higher magnification does not bring out any new featureseither in the peculiar ferrite or in the pearlite. Figs. 13 and 14, at 240diameters, show the curved and straight-Uned ferrite. * Associate Professor (in charge) of Metallurgy and Ore Dressing, MissouriSchool of Mines and Trans. (1920) 62, 347. 438 NEW OCCURRENCE OF PRO-EUTECTOID FERRITE. Fig. 1.—Etched with picric acid and mag-nified 3 diameters. Shows typical ingotstructure. Cross-sectional area. Fig. 2.—Etched with PICRIC ACID and magnified 3 diameters. Shows asin;Fig. 1, but is longi-tudinal surface. CHARLES Y. CLAYTON 439


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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries