Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 409
us and expensive. If thezinc is not removed to a large extent, it will, in smelting the ore, carry off by evaporation much of theother metals, gold and silver not excepted. The sulphurets of zinc and lead are very fusible if in con-tact. In roasting the ore these two sulphurets will invariably melt… … The lead from these blast-furnaces is transferrea to tlie refining-furnace. Formerly the English re-fining-furnace was used as it is represented in Fig. 2819, in a longitudinal section. Here is a double,or two furnaces represented, which, as is shown, are reverberatory furnaces. The fireplace a…
Mechanical engineering · Mechanics · Engineering
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