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Rockwell number

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noun Metallurgy.
  1. a numerical expression of the hardness of a metal as determined by a test (Rockwell 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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Origin of Rockwell number

1930–35, Americanism; named after Stanley P. Rockwell, 20th-century American metallurgist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018