Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . o{ thi- Glass-makers Soap. A name given to man-ganese, fnaii its cleansing action in its glass-making materials. It is nseil to rid the materials of color arising fromcarbonaceous matters and protoxide of iron. An ex-cess of it gives a purple tinge to the glass ; much ad-mired by some, and supposed — bj some — to have asjieritic ellec
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . o{ thi- Glass-makers Soap. A name given to man-ganese, fnaii its cleansing action in its glass-making materials. It is nseil to rid the materials of color arising fromcarbonaceous matters and protoxide of iron. An ex-cess of it gives a purple tinge to the glass ; much ad-mired by some, and supposed — bj some — to have asjieritic ellect in urging \egetation in conservatories. Glass-metal. Glass in fusion in the pot. Glass-mold. A metallic shap)ing-box in whichglass is ]piessed or lilown to fomi. In the case ofsolid articles, the glass for the knob or ornament is GLASS-MOLD. 981 GLASS MOSAICS. placed ia a plastic couJltiou in the mold, ami thena plunger drives it foicibly into all the reces-ses of themold. After a few moments of setting, the moldis opened, and the object is taken out and carried tothe annealing-oven. This is the usual mode of mak-ing glass insulators for telegraph-wires, paper-weights, drops for chandeliers, and the solid kind Fig. man blows it still farther, rolls the pontil on thechair-arm while he fashions it by the .shears, wliichare seen lying on the bench, and then sli]»s it intothe open mold and closes the latter by a spring whilehe blows it to its final expansion. In some water is made to circulate throughthe molds, to abate the heat and allow the work toproceed more speedily. Molds are sometimes madeto be closed by a treadle. See Plate XX. Fig. 2246 shows a mold for nuiking tumblers, —foot, stem, and Vjowl. The conijiliiatiou of formand the hollow character of tlie bowl rei|uire thata number of parts shall be employed, so that theware may be taken out after molding. The foot ismolded in cup foim by the ))luuger C and njatrix B,and is afterwards expanded. The stem
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
