rockwell scale

Main Entry:  Rockwell scale
Part of Speech:  n
Definition:  a measurement system used by commercial manufacturers to determine the relative hardness of objects based on the depth of indentation from a heavy object; also Rockwell hardness
Example:  Each Rockwell scale is an arbitrarily defined range of numbers from 0 to 100 covering a specific range of material hardness. Many knife manufacturers indicate the Rockwell hardness of their knife blades.
Etymology:  1919
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