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Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
iny. See glass. Oriental porcelain was imported into Europe by the Portuguese in the beginning of the sixteenth century; but this was not the first of the trade, though perhaps the first important venture in the way of porcelain merchandising. Early in the fifteenth century, the French king, Charles VII., had pieces in his collection: in 1487, Lorenzo de Medici received several valuable porcelain vases from the Sultan of Egypt. The Marchese Campori of Modena cites a letter, written in 1567, referring to Bernardo Carnigiani as the rediscoverer of the art of making porcelain. This was more than a century before Botticher, who was, however, an original (not first) discoverer. The incident which directed Botticher's attention to the subject was observing the contents of some crucibles in which some alchemical preparations had been heated. This was noticed to resemble porcelain, which then was a curiosity and of great value. The material which gave the peculiar character to th
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
y; levigation is comminution assisted by a liquid. Trituration of grain is usually conducted between stones, as in grinding-mill (which see). Of spices and allied articles, such as coffee, pepper, etc., by steel mills. See coffee-mill; paint-mill; etc. Of drugs and snuff, by pestle and mortar. See mortar. Of ores and rocks, by edge-rollers (see Chilian mill), stamps, or by horizontally rotating mullers in pans. See Amalgama-Tor; arrastra. See also Plates XXXIV., XXXV., and pages 1567-72. The variety of mills or grinders is very great, and a list may be found under mill (page 1440). Triv′et. 1. The knife wherewith the loops of terry fabrics are cut. Velvets and Wilton carpets, for instance, are woven with loops, the warp being carried over wires in the shed. On the top of each wire is a groove which forms a guide for the trvet, which, by a dexterous motion of the operator, is thus driven along the wire, cutting all the loops and making a pile fabric; or cut-pil