. Dental metallurgy, for the use of dental students and practitioners. Fig. 3i Fig. 33 pulverized bone-ash with to 2 per cent, of fire-clay andwith a little water, just enough to make it stick togetherwithout making it appear wet. This is then packed into asuitable mold and compressed by means of a die. Thecupel is then removed from the mold and allowed to become. Fig. 34 thoroughly dry in the air, and finally calcined to expel allmoisture and to decompose any organic matter which mightbe present in the form of splinters of wood, small pieces ofpaper or other impurities. If this calcinatin
. Dental metallurgy, for the use of dental students and practitioners. Fig. 3i Fig. 33 pulverized bone-ash with to 2 per cent, of fire-clay andwith a little water, just enough to make it stick togetherwithout making it appear wet. This is then packed into asuitable mold and compressed by means of a die. Thecupel is then removed from the mold and allowed to become. Fig. 34 thoroughly dry in the air, and finally calcined to expel allmoisture and to decompose any organic matter which mightbe present in the form of splinters of wood, small pieces ofpaper or other impurities. If this calcinating were not done,the gases arising when first heated would cause a spattering HEATING DEVICES 91 of the molten lead and a consequent loss of noble metal inthe assay. Scorification Molds (Fig. 33) .—These are used for pouringthe assay charge. The conical shape is preferable to theold-fashioned flat style.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1917
