. Transactions. anneal-ing temperature (1100° C. or over) results in a coarse irregular type oftemper carbon, and a coarse-grained ferrite matrix. Anneal V, (785° C).—Fig. 13 is representative of the microstructureof these bars and shows that a certain amount of combined carbon waspresent after annealing. The structure produced, however, is muchfiner than that shown in Figs. 9, 11, and 12, and, except for the cementite,is more like that shown in Fig. 5. Anneal VI, (830° C).—Fig. 14 is thoroughly representative of themicrostructure of white iron annealed at 830° C. It is to be notedthat, althou

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. Transactions. anneal-ing temperature (1100° C. or over) results in a coarse irregular type oftemper carbon, and a coarse-grained ferrite matrix. Anneal V, (785° C).—Fig. 13 is representative of the microstructureof these bars and shows that a certain amount of combined carbon waspresent after annealing. The structure produced, however, is muchfiner than that shown in Figs. 9, 11, and 12, and, except for the cementite,is more like that shown in Fig. 5. Anneal VI, (830° C).—Fig. 14 is thoroughly representative of themicrostructure of white iron annealed at 830° C. It is to be notedthat, although the temper-carbon spots are rather coarse, the ferritegrain is much finer than in the bars annealed at the higher temperatures. Anneal VII, (770° C).—Fig. 15 shows the presence of cementite;Fig. IG, the same specimen etched with sodium picrate, reveals the cemen- * H. S. Rawdon: Efifect of Metallic Structure Upon Properties. Chem & MetEng. (1921) 24, 523. ARTHUR PHILLIPS AND E. S. DAVENPORT 477. ;v^*^:^»rr^

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