Spon, Ernest, Haldane, Robert, Lock, Charles G. Warnford (Charles George Warnford), 1853-1909 · London ; New York : E. & F.N. Spon · leaf 445
l for cupeliation. The residuary copper discs, still con- blast furnace ; the copper-lead alloy taining about 25 per cent, of argentifer- thus formed is cast into discs measur- ous lead, are submitted to greater heat ing 18 in. across and 3 in. thick, by in a sweating furnace (Fig. 172) ; here… … hearth similar to that shown in Fig. mony are dealt with in the following 170, the discs a are ranged on edge manner. The ore is first smelted in a Fig. 171-
Workshop recipes · Technology · Industrial arts
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