Letter | Published:

Stresses involved in Tests of Hardness, and a Table of the Comparative Hardness of Certain Metallic Elements

Nature volume 119, pages 276277 (19 February 1927) | Download Citation



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), and the area of the flat thus formed at the point of the cone by the application of a known force was measured, the hardness being defined as applied force÷area of flat, that is, as the greatest stress which the material can sustain.

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  1. 9 Baring Crescent, Exeter.

    • A. MALLOCK


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