. Transactions. Fig. 1. — MiCROSTRUCTURE OF PURE IRON ABOVE THE ACi TRANSFORMATION. Both micrographs show the surface appearance of the same material,A specimen of which was heated for 30 MiN. AT 950° C. Two networks indicateing two different crystalline arrangements are to be seen. The one show-ing the twinned crystals is the structure prevailing above ^3, the other,superimposed upon the first, corresponds to the structure at lower tempera-tures. Heat-etched. X500. HENRY S. RAWDON AND HOWARD SCOTT 417 the following thernial characteristics: Ac^, 768°; Ac^, 910°; Ar^, 900°;Arz 768° C. The spec
. Transactions. Fig. 1. — MiCROSTRUCTURE OF PURE IRON ABOVE THE ACi TRANSFORMATION. Both micrographs show the surface appearance of the same material,A specimen of which was heated for 30 MiN. AT 950° C. Two networks indicateing two different crystalline arrangements are to be seen. The one show-ing the twinned crystals is the structure prevailing above ^3, the other,superimposed upon the first, corresponds to the structure at lower tempera-tures. Heat-etched. X500. HENRY S. RAWDON AND HOWARD SCOTT 417 the following thernial characteristics: Ac^, 768°; Ac^, 910°; Ar^, 900°;Arz 768° C. The specimens, which were of the size iisetl for thermal.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
