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 410
d by itself or along with other ore. The silver is, in thisoperation, obtained pure in the first heat; it is melted into the form of a cake in a cavity prepared forits reception in the centre of the hearth. In all these refining operations there is an inevitable loss of metal, disappearing in the… … The extraction of silver from its ores by amalgamation is not practised in the United States; tliisprocess requires rich ores and cheap quicksilver. In the old States of the Union there is no prospect ofseeing this process executed; but in CaUfornia, where rich silver ores and mercury ores abound,…
Mechanical engineering · Mechanics · Engineering
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