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alum alumina Arts AUSTELL beds Blue boiled bottom calcareous calcined Carbon caused cent Ceramique CHAPTER chemical China China-clay Chloride clay mining coal colour composed composition consists constituents constructed contains Cornish Cornish Stone CORNWALL crystals cubic decomposed depth diameter ditto earth earthenware engine evaporated feet felspar fire-places Flint flour flues glaze granite HADFIELD'S heat Hence Hurricane Portable Forge hydrogen Kaolin kiln kinds launder Lime limestone linhay Magnesia Manganese manufacture Marl material matter mica Milrei mineral mixed mixture MONMORE GREEN obtained oxide of iron oxygen PAPER MAKERS patent porcelain potash Pottery produce proportion pumped pure purposes quantity quartz rock sand sandstones schists settling pits shaft shales silica sizing Smithy Soda specific gravity square inch steam stopes strata substance sufficient sulphate of alumina sulphuric acid surface tanks temperature thick tons Twad Ultramarine vessel waggon ware weight wheel WOLVERHAMPTON