. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ith another one, which may render it fusible. In both cases, however, the metal fromwhich we wish to part the oxydes must not be volatile; itshould also melt, and form a button at the heal of cupel-lation ; for otherwise it would continue disseminated, at-tached to the portion of oxyde spread over the cupel, andincapable of being collected. The furnace and implements used for assaying in theRoyal Mint and the Goldsmiths Hall, in the city of Lon-don, are the following :— t ^ s,^ I AA
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ith another one, which may render it fusible. In both cases, however, the metal fromwhich we wish to part the oxydes must not be volatile; itshould also melt, and form a button at the heal of cupel-lation ; for otherwise it would continue disseminated, at-tached to the portion of oxyde spread over the cupel, andincapable of being collected. The furnace and implements used for assaying in theRoyal Mint and the Goldsmiths Hall, in the city of Lon-don, are the following :— t ^ s,^ I AAA A, fig. 58, is a front elevation of an assay furnace ; C fflf^m U a a, a view of one of the two iron rollers on which the fur- nace rests, and by means of which it is moved forward orbackward; b, the ash-pit; c c are the ash-pit dampers,which are moved in a horizontal direction towards eachother for regulating the draught of the furnace; d, thedoor, or opening, by which the cupels and assays are intro-duced into the muffle; e, a moveable funnel or chimneyby which the draught of the furnace is ASSAY. 69
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
