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point is drawn, once forward and once backward, over the smooth surface of the material to be tested. The hardness number is the weight in grams required to produce a standard scratch. The scratch selected is one which is just visible to the naked eye as a dark line on a bright reflecting surface. It
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This article presently only relates to the Turner sclerometer for measuring the hardness of metals and minerals and not to the
Schmidt sclerometer for determining the compressive strength of concrete. The objectives and operating principles of these two instruments are different
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is also the scratch which can just be felt with the edge of a quill when the latter is drawn over the smooth surface at right angles to a series of such scratches produced by regularly increasing weights.
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The Turner-Sclerometer test consists of measuring the amount of
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Instrument used to measure the hardness of a material
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202:(1924). "Testing the Hardness of Metals".
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108:References
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
