. Transactions. Fig. 9. Fig. 10. Fig. 9.—Cross-section op nickel-steel container, three adjoining photo-micrographs BEFORE VACUUM. EtCHED 20 SEC. WITH PICRIC ACID. X 50. Fig. 10.—Same area as Fig. 9 after heating in vacuum to 1000° C. severalHOURS. Cracks closed, zone op penetration narrowed. Etched 20 sec. withpicric acid. X 50. 264 NITROGEN IN STEEL AND THE EROSION OF GUNS

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