A Treatise On Ceramic Industries a Complete Manual for Pottery Tile And Brick
The book A Treatise On Ceramic Industries a Complete Manual for Pottery Tile And Brick was written by author Emile Bourry Here you can read free online of A Treatise On Ceramic Industries a Complete Manual for Pottery Tile And Brick book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Treatise On Ceramic Industries a Complete Manual for Pottery Tile And Brick a good or bad book?
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Muffle kilns are sometimes used, but there is a danger that the temperature will not be high enough. In most factories devoted entirely to making architectural terra-cotta it seems best to use round down-draught kilns. The use of fluxes is indispensable, in order to lower the temperature at which they are burned and to obtain goods which will resist the weather. The proportion of fluxes must be such that a hard well- burned body may be obtained between 1000 and 1200 C. ; below that the carbonat...e of lime may not be entirely decomposed. Bodies of a grey or black colour may be obtained by burning them in a very reducing atmosphere, using the methods already described a propos of black tiles (p. 328). When the cost is not against it, colouring oxides may be added. The only oxides used are those of iron and manganese ; the former in the form of earthy ochres or certain iron ores, the latter of washed manganese ores. When, for reasons of economy, or on account of certain difficulties of manufacture, the desired colour cannot be given to the body, then slips must be used.
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