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Rockwell number

noun

, Metallurgy.
  1. a numerical expression of the hardness of a metal as determined by a test Rockwell test made by indenting a test piece with a Brale, or with a steel ball of specific diameter, under two successive loads and measuring the resulting permanent indentation.


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Word History and Origins

Origin of Rockwell number1

1930–35, Americanism; named after Stanley P. Rockwell, 20th-century American metallurgist

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Rockwell, Normanrock wool