Transactions . Osmonds developmentof TschernofTs notation, in which Ac3 is the upper limit of thehypo-eutectoid part of the transformation range as observed in heat-ing up, and Ar3 is that same limit as observed in cooling down,and following the usual custom of calling the upper limit of thehyper-eutectoid part of that range SE, we may go farther and callthis latter limit SEc when observed in heating up and SEr when observed in cooling down. Further, we may call the equilibrium position of these lines, i. e.,the position which they would have in pure iron-carbon alloys if all * A contribution
Transactions . Osmonds developmentof TschernofTs notation, in which Ac3 is the upper limit of thehypo-eutectoid part of the transformation range as observed in heat-ing up, and Ar3 is that same limit as observed in cooling down,and following the usual custom of calling the upper limit of thehyper-eutectoid part of that range SE, we may go farther and callthis latter limit SEc when observed in heating up and SEr when observed in cooling down. Further, we may call the equilibrium position of these lines, i. e.,the position which they would have in pure iron-carbon alloys if all * A contribution from the Metallurgical Laboratories of Columbia University. May 14, 1913. 1 Thermal and Microscopical Examination of Professor Howes Standard CommercialSteels, by G. K. Burgess, J. J. Crowe, and H. S. Rawdon, U. S. Bureau of Standards,p. 605, this volume. 2 Discussion of the Existing Data as to the Position of Ae3, H. M. Howe, p. 611, thisvolume. 588 POSITION OF AE3 IN CARBON-IRON ALLOYS. ca <Eh.
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