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acid alkali already annealing antimony appear applied artist baking basaltic borax calcined China Chinese clay cobalt colour composed composition compound considerable contain copper crown glass crucible degree of heat described diameter earth earthenware effect employed enamel equal fire flint glass fluid flux furnace fused fusible fusion glaze gold grinding Guinand gypsum imparting inches ingredients kao-lin kiln kind Klaproth labour lime litharge manganese manner manufacture mass materials means melted glass ment metallic oxides minium mixed mixture mould nitre occasion operation ornaments oven oxide oxide of iron oxide of lead painting perfect perfectly pieces placed plate glass polish porcelain portion potash pottery powder preparation produced proportion purpose quantity Ravenhead rendered requisite sand seggars silex silica smooth soda specific gravity specimens substance sufficiently surface temperature thickness transparent tube various varnish vessels vitrified ware weight wherein whole workman
Page 124 - Who, when he saw the first sand or ashes, by a casual intenseness of heat, melted into a metalline form, rugged with excrescences, and clouded with impurities, would have imagined, that in this shapeless lump lay concealed so many conveniencies of life, as would in time constitute a great part of the happiness of the world...
Page 17 - ... biscuit, distinguished as jasper, having in general all the properties of the basaltes, with a very important addition, the capability of receiving through its whole substance from the admixture of metallic oxides, the same colours as those oxides communicate to glass or enamel in fusion. This peculiar property...
Page 69 - This, sire, is a condition to which those who force you to act contrary to your own good disposition can never reduce me; because I am prepared for death, and because your whole people have not the power to compel a single potter to bend his knees before images which he has made.
Page 204 - ... grinding and smoothing of a great number of plates of large dimensions, which by means of machinery are thus made to move with great velocity, and in all directions. The next process is that of polishing. For this purpose a substance is used, known in commerce and the arts as colcothar or crocus mortis.
Page 67 - I mix with 27 parts of felspar, 18 of borax, 4 of Lynn sand, 3 of nitre, 3 of soda, and 3 of Cornwall China clay. This mixture is to be melted to a frit, and is then to be ground to a fine powder, 3 parts of calcined borax being added previously to the grinding.
Page 16 - Amsterdam to the furthest part of Sweden, and from Dunkirk to the extremity of the south of France, one is served at every inn upon English ware. Spain, Portugal, and Italy are supplied with it ; and vessels are loaded with it for the East Indies, the West Indies, and the continent of America.
Page 125 - Yet by some such fortuitous liquefaction was mankind taught to procure a body at once in a high degree solid and transparent, which might admit; the light of the sun, and exclude the violence of the wind ; which might extend the sight of the philosopher to new ranges of existence, and charm him at one time with the unbounded extent of the material creation, and at another with the endless subordination of animal life; and, what is yet of more importance, might supply the decays of nature, and succour...
Page 93 - White oxide of tin, 1 Mix the ingredients well in a biscuit-ware mortar, and having put them on a piece of Dutch tile in the muffle, make it gradually red-hot, and suffer it to cool.
Page 249 - ... he was enabled to devote more of his earnings to the prosecution of experiments, which he thenceforth undertook upon a scale more likely by their results to reward his perseverance. In this pursuit he was still exposed to numerous accidents and difficulties, which would have deterred most persons from continuing the research. His furnace, which he had constructed with his own hands, out of such materials as he could procure, and which was capable of melting at once 200 Ibs. weight of glass, proved...