A practical treatise on mechanical dentistry . fle even though it is cracked; thus the most delicate porcelaincan be baked without the least danger of so-called gasing. Also,it will be seen that by connecting the rubber pipe with retorts ofgasometers any desired vapor or gas could be forced into themuffle, making the furnace invaluable for scientific experiments. Fig. 30 illustrates the furnace thrown open, being swung onhinges at the back, exposing the muffle, E. The groove, P P, ispacked with asbestos fiber, so that when the sections are broughttogether the furnace will be perfectly air- and
A practical treatise on mechanical dentistry . fle even though it is cracked; thus the most delicate porcelaincan be baked without the least danger of so-called gasing. Also,it will be seen that by connecting the rubber pipe with retorts ofgasometers any desired vapor or gas could be forced into themuffle, making the furnace invaluable for scientific experiments. Fig. 30 illustrates the furnace thrown open, being swung onhinges at the back, exposing the muffle, E. The groove, P P, ispacked with asbestos fiber, so that when the sections are broughttogether the furnace will be perfectly air- and gas-tight. The GENERATION AND APPLICATION OF HEAT. 57 hooks, F F, are to hold the upper section secure to the gas and air connections are so arranged that the ordinary-blowpipe can be attached, as shown at G. When the muffle, E,is removed, it exposes two burners and a fire-brick surface madeto fit the various appliances for crucible, ladle, and blowpipe or both burners can be operated in conjunction with the blow- Fig. pipe, G. The air-cock, R, is to provide a means for shutting offthe air supply from either burner when required. H is the gassupply; K, air-pipe connecting with the bellows. Size of muffle,inside measurement, 8 inches long, ^A inches wide, 2^ incheshigh. With gasolene gas porcelain teeth can be enameled in from 58 MECHANICAL DENTISTRY. ten to fifteen minutes; with ordinary city gas in from fifteen totwenty-five minutes, according to quality. In thirty minutes aheat sufficient to destroy the muffle can be produced, whichindicates a temperature of over 32400 F., much higher than isever needed for any kind of work, except the fusing of platinum. Fig. 30.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1903
