. Transactions. Fig. 11.—Surface changes produced in low-carbon steel by heating abovethe az transformation. a polished specimen was heated continuously FOR 4 HR. ABOVE THE Ac% TRANSFORMATION TEMPERATURE. ThE HEAT-ETCHEDSURFACE WAS THEN PROTECTED WITH A DEPOSIT OF ELECTROLYTIC COPPER AND THESPECIMEN WAS CUT PERPENDICULAR TO THIS FACE. ETCHING 2 PER CENT. ALCOHOLIC NITRIC ACID. X500. The MICROGRAPH represents: . ^^k a. Edge of the section, showing the thickness of the carbonless Average structure at the center of the specimen. HENRY S. RAWDON AND HOWARD SCOTT 429.

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries