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Books Books 1 - 5 of 5 on ... process alone is not sufficient, if we intend to make a more sure and extensive....  
" ... process alone is not sufficient, if we intend to make a more sure and extensive application of the characters that may be taken from hardness, than that which has hitherto been common in Mineralogy. But if we take several specimens of one and the... "
A System of Crystallography, with Its Application to Mineralogy - Page 96
by John Joseph Griffin - 1841 - 469 pages
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Treatise on Mineralogy: Or, The Natural History of the Mineral Kingdom, Volume 1

Friedrich Mohs - Mineralogy - 1825
...effect of that of the simple mineral. The application of the edges is subject to similar difficulties. Numerous experiments of determining the degree of...a broad face. It is necessary also that the force applird in thie experiment, be always the least possible. Every person, however little accustomed,...
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Treatise on Mineralogy: Or, The Natural History of the Mineral Kingdom, Volume 1

Friedrich Mohs - Mineralogy - 1825
...hardness, by the mere scratching of one substance with the other, have completely established, that Uiis process alone is not sufficient, if we intend to make...a broad face. It is necessary also that the force applicd in this experiment, be alieays 1hc least potsible. Every person, however little accustomed,...
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Treatise on mineralogy, or The natural history of the mineral ..., Volume 1

Friedrich Mohs - 1825
...we take several specimens of one and the same mineral, and pass them over a fine file, we shall rind that an equal force will everywhere produce an equal...sharp corner, while the other is applied to it by abroad face. It is necessary also that the foree applied in this experiment > be ahvuys the Jeast possible....
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A System of Crystallography,: With Its Application to Mineralogy

John Joseph Griffin - Crystallography - 1841 - 489 pages
...Diamond. " Numerous experiments of determining the degree of hardness, by the mere scratching if one substance with the other, have completely established,...contact with the file be of a similar size, so that tie one does not present to the file a very sharp corner, while the other is applied to it by a broad...
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A Treatise on Mineralogy, Issue 1

Charles Upham Shepard - Mineralogy - 1852 - 245 pages
...take several specimens of one and the same mineral, and pass over them a fine file, it will be found, that an equal force will everywhere produce an equal...parts of the mineral in contact with the file be of similar size, so that the one does not present to the file a very sharp corner, while the other is...
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