. Journal. ig. 1 is a trough of platinum,semi-circular in cross-section, and B is a flange secured toA near its top, and extending around its periphery, thusleaving a gutter C. D is a cover which rests in thegutter ; E is the inlet pipe for the acid, and is placednear the top ; F is an outlet for escaping fumes ; G is anoverflow pipe ; H is the main outlet, leading into anequalising jar, whence the acid flows into convenientreceptacles. The equalising jar consists of an inner andouter jar, between which a stream of cold water is is so placed that its outlet shall be level with thehei
. Journal. ig. 1 is a trough of platinum,semi-circular in cross-section, and B is a flange secured toA near its top, and extending around its periphery, thusleaving a gutter C. D is a cover which rests in thegutter ; E is the inlet pipe for the acid, and is placednear the top ; F is an outlet for escaping fumes ; G is anoverflow pipe ; H is the main outlet, leading into anequalising jar, whence the acid flows into convenientreceptacles. The equalising jar consists of an inner andouter jar, between which a stream of cold water is is so placed that its outlet shall be level with theheight at which the acid is desired to be kept in the still. (x + y) would only be right if x = y—that is to say,if the glass contains eciual equivalents of alkalis andearths, the amount of silica should be six times as formula is now compared with some analyses ofglass, published by R. W eber, which has been foundin practice to possess the physical qualities required ]these analyses there was— ). Before commencing to distil, the gutter C is filled withany liquid so as to form a hydraulic lute, and theequalising jar is filled with acid up to the level of itsoutlet. The acid to be concentrated is then allowed toflow slowly into the still through E. The main outlet isconnected with the still at the point where the end-risecommences from the bottom, and thus will carry off acidfrom the very lowest portion of the still, whereby onlythat of the greatest specilic gravity and consequent con-centration flows off. The How of the acid at the bottomoutlet also carries oftinto equalising jar deposits of leadand iron sulphide contained in the acid and precipitatedin the course of concentration, which would otherwiseburn fast to the bottom of the still, and crack the bottom,owing to unequal expansion.—S. H. TIE.—GLASS, POTTERY, AND EARTHENWARE. Remarks on the Calculation of Mixings for the Manu-facture of Glass. E. Tscheuschenr. Dingl. iolyt. , the many
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
