Abstract
MR. HUGH O'NEILL, in his letter in NATURE of March 31, p. 430, gives what he calls Hu, the “ultimate hardness” of tin, zinc, and steel. On referring to my letter at p. 17 of NATURE of January 6, it will be seen that H is there used for Hu, and that the pressure of fluidity = twice the ultimate hardness. The units of Hu given at p. 430 are evidently kilograms per sq. mm. Expressing these in kilos per sq. cm. and multiplying by 2 we obtain the following values of the pressures of fluidity as calculated by Mr. O'Neill by means of his equation given at p. 773 of NATURE of December 9, 1922.
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ACKERMANN, A. Pressure of Fluidity of Metals. Nature 111, 534–535 (1923). https://doi.org/10.1038/111534d0
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DOI: https://doi.org/10.1038/111534d0
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