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Books Books 1 - 6 of 6 on Care must be taken to employ specimens of each of them nearly agreeing in form and....
" Care must be taken to employ specimens of each of them nearly agreeing in form and size, and also as much as possible in the quality of their angles. From the resistance these bodies oppose to the file, and from the noise occasioned by their passing over... "
A System of Crystallography,: With Its Application to Mineralogy - Page 96
by John Joseph Griffin - 1841 - 489 pages
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Treatise on Mineralogy: Or, The Natural History of the Mineral Kingdom, Volume 1

Friedrich Mohs - Mineralogy - 1825
...immediately, by their mutual scratching, but mediately, through the File, and determined accordingly. First we try, with a corner of the given mineral,...ones. Their absolute hardness is of no consequence ; hence every file will be applicable, whose hardness la in the necessary relation with thai of the...
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Treatise on mineralogy, or The natural history of the mineral ..., Volume 1

Friedrich Mohs - 1825
...immediately, by their mutual scratching, but mediately, through the File, and determined accordingly. First we try, with a corner of the given mineral,...ones. Their absolute hardness is of no consequence ; hence every file will be applicable, whose hardness is in the necessary relation with that of the...
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Treatise on Mineralogy: Or, The Natural History of the Mineral Kingdom, Volume 1

Friedrich Mohs - Mineralogy - 1825
...repeated with all the alterations thought necessary, till we may consider ourselves arrived at a fan: estimate, which is at last expressed by the number...ones. Their absolute hardness is of no consequence ; hence every file will be applicable, whose hardness is in the necessary relation with that of the...
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A System of Crystallography: With Its Application to Mineralogy

John Joseph Griffin - Crystallography - 1841 - 469 pages
...the file, and determined accordingly. " The process of this determination is as follows: " First, wo try, with a corner of the given mineral, to scratch...ones. Their absolute hardness is of no consequence ; hence every file will bo applicable whose hardness is in the necessary relation with that of the...
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A system of crystallography, with its application to mineralogy

John Joseph Griffin - Science - 1841 - 469 pages
...we argue with perfect security upon their mutual relations in respect to hardness. The experiment U repeated with all the alterations thought necessary,...nearest, the decimals being likewise added, if required. 1 The files answering best for the purpose are fine and very hard ones. Their absolute hardness is...
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A Treatise on Mineralogy, Issue 1

Charles Upham Shepard - Mineralogy - 1852 - 245 pages
...experiment is repeated with all the alterations thought necessary, till we may consider ourselves as having arrived at a fair estimate ; which is at last expressed...ones. Their absolute hardness is of no consequence ; hence, every file will be applicable, whose hardness is in the necessary relation with that of the...
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