the head of a hammer, and particularly of a steam-driven hammer

listen to the pronunciation of the head of a hammer, and particularly of a steam-driven hammer
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The head of a hammer, and particularly of a steam-driven hammer.
tup

Rockwell hardness test: A method of measuring hardness. The hardness is expressed as a number related to the depth of the residual penetration. A test for determining the hardness of a material based on the depth of penetration of a specified penetrator in to the specimen under certain arbitrarily fixed condition of test. A hardness test where the loss in kinetic energy of a falling diamond tipped metal ‘tup’, absorbed by indentation upon impact of the tup on the metal being tested is indicated by the height of rebound.

the head of a hammer, and particularly of a steam-driven hammer
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