Practical dental metallurgyA text- and reference-book for students and practitioners of dentistry .. . Fig. 14. smaller end of the tube beyond by the projection of thatportion of the stem a slight distance into the chamber. Fletcher has much improved upon this simple form ofblow-pipe by coiling the smaller extremity of the steminto a light spiral over the point of the jet (Fig. 14).The air as it traverses the coil is heated, producing ahot blast instead of a cold one, as in the old form. Suchan instrument enables the operator to produce a highertemperature than that produced with the ordinary
Practical dental metallurgyA text- and reference-book for students and practitioners of dentistry .. . Fig. 14. smaller end of the tube beyond by the projection of thatportion of the stem a slight distance into the chamber. Fletcher has much improved upon this simple form ofblow-pipe by coiling the smaller extremity of the steminto a light spiral over the point of the jet (Fig. 14).The air as it traverses the coil is heated, producing ahot blast instead of a cold one, as in the old form. Suchan instrument enables the operator to produce a highertemperature than that produced with the ordinary pipewith the same amount of energy. The same pipe may. Fig. 15. be fitted with a hard-rubber mouth-piece, which is lesstiresome to grip in the mouth. Another form by the same inventor is illustrated inFig. 15. This is wholly unlike any mouth blow-pipeyet devised, and admits of considerable latitude of MELTING METALS. 71 movements in the application of heat by the rubber tubingconnected with it. The mouth-piece is so constructed thata shield protects the lips in such a manner that long-con-tinued blowing may be practiced without undue strain onthe lip?, while the opening is well under the controlof the tongue. It is also provided with a condensingchamber and interchangeable tip, either plain or coiled. FLAME.—Flame consists of a sheet of burning burning candle presents a type of all other flames,serving to illustrate its general structure. If such aflame be examined closely it will be founddivisible into four separate parts. The por-tion which immediately surrounds the wick,represented in the figure by A, B, is a deepblue. This p
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Keywords: ., boo, bookcentury1800, bookdecade1890, booksubjectdentalmetallurgy
