This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 Excerpt: ...in Ireland for the manufacture of porcelain, in which so very successful results have been achieved by the enterprise and taste of the Belleek Pottery Co., in County Fermanagh. The writer was indebted to Mr. Armstrong for information regarding the felspar and porcelain clay of that county. Judging from the almost ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 Excerpt: ...in Ireland for the manufacture of porcelain, in which so very successful results have been achieved by the enterprise and taste of the Belleek Pottery Co., in County Fermanagh. The writer was indebted to Mr. Armstrong for information regarding the felspar and porcelain clay of that county. Judging from the almost entire absence of Irish localities for it, in mineralogical works, the common orthoclase felspar, which has now to be brought all the way from Norway for our porcelain manufacturers, is of rare occurrence in Ireland. Bristow, for instance, gives only the single locality of Slieve Corra, Mourne Mountains, for it, and there apparently it occurs only in crystals, and not in the massive form; although the decomposed masses of granite in these mountains, which were referred to as yielding china clay, are doubtless derived from its felspathic constituent, and that may probably be orthoclase. As shown, however, in the last chapter, from Kinaghan, Ireland possesses numerous dykes of petrosilex, of identical composition to the one near Westport, County Mayo, mentioned by him as having by decomposition been changed into a dyke of china clay; and it has also numerous other varieties of felsites of similar composition. The officers of the Geological Survey do not, as a rule, apparently consider it part of their duty to point out such rocks in Ireland as might furnish materials for technical purposes, but Jukes, in his Manual of Geology,1 quotes analyses of petrosilex by Durocher, the mean of which is as follows: --100-00-Sow this bears so remarkable a resemblance to the mineral which Dr. J. Hoffman, in his description of the porcelain quarries of Japan, describes as white and hard as rock, and which the Japanese, he says, break with hammers and pulverise in mil..
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