Presented at the sixtieth annual meeting, Atlantic City, N. J., June 18, 1957. presented at the sixty-third annual meeting, American Society for Testing Materials, June 28, 1960. Symposium on determination of gases in metals :: Presented at the sixtieth annual meeting, Atlantic City, N. J., June 18, 1957. Symposium on impact testing, presented at the 58th annual meeting ASTM Atlantic City, N. J., June 27, 1955. Presented at the sixty-sixth annual meeting, american Society for Testing and Materials, Atlantic City, N. J., June 26, 1963. Presented at the sixty-fifth annual meeting, American Society for Testing and Materials, New York, N. Y., June 27, 1962.