The sclerometer (from the Ancient Greekskleros meaning "hard") is a mineralogist's (usually) instrument used to measure the hardness of materials. Ancient Greek refers to the stage in the history of the Greek language corresponding to Classical Antiquity, which normally applies on two ancient periods of Greek history: Archaic and Classic Greece. ... Mineralogy is an earth science that involves the chemistry, crystal structure, and physical (including optical) properties of minerals. ...
The instrument is designed to determine the degree of hardness of a given mineral by applying pressure on a moving diamond point until a "scratch" has occurred. Diamond - Wikipedia, the free encyclopedia /**/ @import /skins-1. ...
These are the sclerometer method introduced by Turner in 1896; the scleroscope method recently invented by Shore; the indentation test adopted by Brinell about 1900; and the drill test introduced by Keep a few years earlier.
Turner's Sclerometer is the method used to test the hardness of minerals.
Turner's Sclerometer - In this form of test a weighted diamond point is drawn, once forward and once backward, over the smooth surface of the material to be tested.
The sclerometer is cheap, portable, and easily applied, but it is not applicable to materials which do not possess a fairly smooth reflecting surface and the standard scratch is only definitely recognized after some experience.
The Short test is simple, rapid and definite for materials for which it is suited, but results obtained vary somewhat with the size and thickness of the sample.
The accompanying table gives values obtained on the same materials by the scleroscope, sclerometer, and the Brinell test, the figures being reduced to a common unit, assumed as 1 as a starting point; thus the actual Brinell numerals have been divided by 6, thereby reducing the hardness values for purposes of comparison.
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