The story
Developed by Frederick Knoop and colleagues at the National Bureau of Standards of the United States in 1939.
Etymology from Wiktionary, CC BY-SA 4.0.
Knoop test
Today it means: A microhardness test in which a pyramidal diamond point is pressed into the polished surface of the test material with a known load, for a specified dwell time, and the resulting indentation is measured using a microscope. Full definition →