n made of protective coatings ofplaster oi paris. These are used for two purposes, themost important being to enclose a fragile body in aharder casing; it is also used to coat a porous materialso as to render it suitable for painting and assembling. A creamy mixture of plaster of paris is made and… … Theory and Practice of Firing. THE whole of the pottery industry centres round the peculiar property of clay which causes it underthe action of heat to become permanently hard anddurable, the firing thus being an essential process ofmanufacture. The character of the firing determinesin a very large…
Pottery · Glass · Glassware
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![An illustration from Chroniques berrichonnes du XVIIe siècle. Journal des choses mémorables arrivées en la ville de Bourges et autres lieux de la province, 1621-1694. [By P. Le Large; continued by Claude and Jehan Le Large.] Mises en ordre et publiées par H. Jongleux, etc (1881)](https://img.insideoutlibrary.com/img/200/bl-bl_002125437_0-173-1.webp)