Some tests of light aluminum casting alloys — the effect of heat treatment. . DEPARTMENT OF COMMERCE Technologic Papers OF THE Bureau of Standards S. W. STRATTON, Director No. 139 SOME TESTS OF LIGHT ALUMINUM CAST-ING ALLOYS-THE EFFECT OFHEAT TREATMENT BY P. D. MERICA, Physicist and C. P. KARR, Associate Physicist Bureau of Standards ISSUED OCTOBER 24, 1919

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