History of Inventions Discoveries And Origins
History of Inventions Discoveries And Origins
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As it is very difficult to give a description of them, and still more so for the reader to comprehend them without figures, we refer to the Penny Cyclopaedia, art. " Sowing-machine, " for an account of the more important. ] MANGANESE'.
THAT the art of glass-making may have arisen from an acci- dent, such as that mentioned by Pliny 2, I am ready to admit; but by what accident were artists made acquainted with the use of manganese, a mineral the outward appearance of which seems to announce nothi...ng that could be useful to the glass- maker ? It is not found in such abundance as to allow us to suppose that it naturally presented itself; nor do we know that any older application of it may have induced the an- cients to employ and examine it in such a manner that the present use of it might be accidentally discovered. In gene- ral, it resembles some kinds of iron-stone, which it was con- sidered to be till a very late period. That iron, however, colours glass must have been very early remarked ; and there- fore it could occur to no one to employ manganese for de- priving frit 3 of its colour.
What to read after History of Inventions Discoveries And Origins?
You can find similar books in the "Read Also" column, or choose other free books by Johann Beckmann to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
As it is very difficult to give a description of them, and still more so for the reader to comprehend them without figures, we refer to the Penny Cyclopaedia, art. " Sowing-machine, " for an account of the more important. ] MANGANESE'.
THAT the art of glass-making may have arisen from an acci- dent, such as that mentioned by Pliny 2, I am ready to admit; but by what accident were artists made acquainted with the use of manganese, a mineral the outward appearance of which seems to announce nothi...ng that could be useful to the glass- maker ? It is not found in such abundance as to allow us to suppose that it naturally presented itself; nor do we know that any older application of it may have induced the an- cients to employ and examine it in such a manner that the present use of it might be accidentally discovered. In gene- ral, it resembles some kinds of iron-stone, which it was con- sidered to be till a very late period. That iron, however, colours glass must have been very early remarked ; and there- fore it could occur to no one to employ manganese for de- priving frit 3 of its colour.
What to read after History of Inventions Discoveries And Origins?
You can find similar books in the "Read Also" column, or choose other free books by Johann Beckmann to read onlineMoreLess
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