. Transactions. / / / / / { / 1 / / f / J r / / CONSTITUTION AND MELTING-POINTS OF COPPER-SLAGS. 769 convection-currents, which are delayed in the viscous materialuntil it becomes sufficiently superheated. The Furnace.—The most suitable furnace for obtaining uni-form heating-conditions is some form of electric-resistancefurnace. In this work it was expected that temperatures above1,400° C. would be required. Most furnaces on the market,with the exception of platinum-wound furnaces, are not avail-able, as this temperature is beyond that for which they are. Magnesia Fire-Clay Gruphite Kryptol Fi
. Transactions. / / / / / { / 1 / / f / J r / / CONSTITUTION AND MELTING-POINTS OF COPPER-SLAGS. 769 convection-currents, which are delayed in the viscous materialuntil it becomes sufficiently superheated. The Furnace.—The most suitable furnace for obtaining uni-form heating-conditions is some form of electric-resistancefurnace. In this work it was expected that temperatures above1,400° C. would be required. Most furnaces on the market,with the exception of platinum-wound furnaces, are not avail-able, as this temperature is beyond that for which they are. Magnesia Fire-Clay Gruphite Kryptol Fig. 6.—Electric-Resistance Furnace. constructed. This refers to furnaces in which the heating-rate is under such control as to permit their use for scientificinvestigation. A foreign carbon-resistance furnace was im-ported, but proved unsuitable in the work. After consider-able experimental work the furnace shown in detail drawing inFig. 6 and in perspective in Fig. 7 was built, and gave most ex-cellent service. The resistor is kryptol. The cross-section andlength of the resistor cylinder are designed for a 115-volt directcurrent. The current-consumption is from 10 to 30 amperes. 770 CONSTITUTION AND MELTING-POINTS OF COPPER-SLAGS.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
