IN NATURE of Jan. 23, 1926 (vol. 117, p. 117), I gave a description of a method of determining Hardness, in which a cone of the material to be tested was pressed against a hard surface (sapphire ...
Messrs. Calvert and Johnson made a series of experiments with pretty large masses of metal to test their comparative hardness; and the following is a most useful table which has been prepared ...
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