. An illustrated dictionary of words used in art and archaeology. Explaining terms frequently used in works on architecture, arms, bronzes, Christian art, colour, costume, decoration, devices, emblems, heraldry, lace, personal ornaments, pottery, painting, sculpture, &c, with their derivations . uscombinations,from which vari-ous colouring mat-ters are obtainedof great use in thearts. Cobalt blue,a beautiful bluepigment, is ob-tained by mixing a salt of pure cobalt with asolution of pure alum, precipitating the liquidby an alkaline carbonate, washing the preci-pitate with care, drying and igni
. An illustrated dictionary of words used in art and archaeology. Explaining terms frequently used in works on architecture, arms, bronzes, Christian art, colour, costume, decoration, devices, emblems, heraldry, lace, personal ornaments, pottery, painting, sculpture, &c, with their derivations . uscombinations,from which vari-ous colouring mat-ters are obtainedof great use in thearts. Cobalt blue,a beautiful bluepigment, is ob-tained by mixing a salt of pure cobalt with asolution of pure alum, precipitating the liquidby an alkaline carbonate, washing the preci-pitate with care, drying and igniting it fine green, known as Hini/iaiiiis green, issimilarly prepared. The chloride, the nitrate,and the sulphate of cobalt form sympathetic inks,which only become visible when the moisture isabsorbed by the application of heat. Fromphosphate of cobalt a beautiful blue pigmentis produced, called Thoiards blue. It is saidto have all the characters of ultramarine. Oxideof coljalt has the property of colouring glassblue ; hence a glass formed of this oxide underthe name of s?)ialt is the blue colouring matterused for ornamenting porcelain and earthen-ware, for staining glass, for painting on enamel,&c. Cobalt-bloom. (See Erythrine.)Cobbards, O. E. The irons supporting a Fig. 176. Coat on shield. Cob-wall, Arch. A wall formed of unbumedclay mixed with straw. Cochineal. (See Carmine.) Cochineal Lakes. (See CarminatedLakes.) Cochlea (, i. e. a snail with spiralshell). Any object of spiral shape, like ascrew ; and so a worm and screw as a mecha-nical power in oil-, wine-, &c. presses ; theArchimedean Screw, or water-snail forraising water ; the revolving door throughwhich the wild beasts were let out into theamphitheatre ; and other contrivances similarto the Italian riiota, by which persons can beintroduced through a wall without opening adoor ; also a spiral staircase, (S;c. Cochlear, Cochleare (from k6x>^o%, a shell-fish), (i) A spoon hav
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