Practical dental metallurgyA text- and reference-book for students and practitioners of dentistry .. . Fig. 10. It is also very useful for brazing, soldering, heating upbridge-cases or metal plates to solder, etc. It has tworemovable rings of different widths, which set on abovethe flaring base to carry the heat up around the crucible,the wide or narrow ring being used, according to the size 68 PRACTICAL DKNTAL METALLURGY. of the crucible; or both rings may be put on at the sametime. It also has a conical-shaped top which can be seton above the rings to confine the heat when it is desiredto fu
Practical dental metallurgyA text- and reference-book for students and practitioners of dentistry .. . Fig. 10. It is also very useful for brazing, soldering, heating upbridge-cases or metal plates to solder, etc. It has tworemovable rings of different widths, which set on abovethe flaring base to carry the heat up around the crucible,the wide or narrow ring being used, according to the size 68 PRACTICAL DKNTAL METALLURGY. of the crucible; or both rings may be put on at the sametime. It also has a conical-shaped top which can be seton above the rings to confine the heat when it is desiredto fuse any high fusing substance. This furnace can be used for baking continuous-gumwork, or any other porcelain Fig. 11. For those metals which fuse much before redness,such as zinc, lead, tin, and their alloys, iron ladles areusually employed. In the dental laboratory for meltingzinc, lead, or alloys, for making dies and counter-dies, iron melting-pots (Fig. 11),capable of holding from 6 to10 pounds of metal, are metal may be most con-veniently melted over one ofFletchers solid-flame gauze-top stoves, shown in The stove is so con-structed that the gas mixedwith the proper proportion of air from below is burnedabove the gauze top, yielding a blue flame, intenselyhot and perfectly solid and uniform. The consumptionof gas is about two cubic feet per hour for each squareinch of gauze surface. It will melt an ordinary pot oflead in 12 minutes, depending on the gas supply. An
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Keywords: ., boo, bookcentury1800, bookdecade1890, booksubjectdentalmetallurgy
