The Engineer's and Mechanics Encyclopædia,
comprehending practical illustrations of the machinery and processes employed in every description of manufacture of the British Empire.
With nearly Two Thousand Engravings.
By Luke Hebert, civil engineer, edifor of the History and Progress of the Steam Engines, Register of Arts and Journal of Patent Inventions, etc.
In two volumes.
VOL. II.
London: Thomas Kelly, 17, Paternoster Row.
MDCCCXXXVI (1836).
The name given to a kind of earth, which forms one of the ingredients in the manufacture of oriental porcelain. The other ingredient, which is called petuntse, is easily verifiable, while kaolin is scarcely so; hence, it is said, the action of the fire upon the mixture causes that semi-vitrification called porcelain. M. Bomare, who analysed some Chinese kaolin, states its composition to be a compound earth, consisting of clay, to which it owes its tenacity; of calcareous earth, whence its mealy appearance; and of crystals of mica and quartz. Similar earths to the kaolin are often found in the neigh bourhood of granites.
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