English porcelain : a handbook to the china made in England during the eighteenth century as illustrated by specimens in the national collections . sh tint. It is thin, slightly vesicular or bubbled,and while smooth is not very shiny, having indeed a rich creamyifsurface. Its hardness approaches 6° and is very nearly that offused felspar. The cause of the hardness and other fine qualitiesof Champions porcelain, is explained when we turn to its is to the very high proportion of silica in it that its density,hardness, and durability are mainly due. The larger the propor-tion of silic
English porcelain : a handbook to the china made in England during the eighteenth century as illustrated by specimens in the national collections . sh tint. It is thin, slightly vesicular or bubbled,and while smooth is not very shiny, having indeed a rich creamyifsurface. Its hardness approaches 6° and is very nearly that offused felspar. The cause of the hardness and other fine qualitiesof Champions porcelain, is explained when we turn to its is to the very high proportion of silica in it that its density,hardness, and durability are mainly due. The larger the propor-tion of silica present, the higher the temperature the paste willrequire and will bear in the kiln, and the more compact will bethe resulting porcelain. A broken handle of a tea-cup, authenti-cated as Champions manufacture, gave, after grinding off the glaze,the following results in 100 parts as the mean of two carefulanalyses:— Silica . . .62*92 Lime . . 1*28 Alumina . .33*16 Alkalies . .2*64 It will be seen that the alkalies and lime of the Bristol porcelani Fig. 41.—BRISTOL : VASE, PAINTED WITH TREES AND TROPICAL
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherlondo, bookyear1894
