Abstract
IN the ball hardness test Meyer found that L =adn. By combining this relation with Brinell's formula H = L/A, it can be shown that the hardness number when the ball is immersed up to its diameter is This value has been called the “ultimate hardness” (Hu), and is independent of the initial condition of the metal with regard to cold work.
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O'NEILL, H. Ball Hardness and Scleroscope Hardness. Nature 111, 430–431 (1923). https://doi.org/10.1038/111430b0
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DOI: https://doi.org/10.1038/111430b0
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