Metal-work; a handbook for teachers and students (1914)
Adam, Hugh M. [from old catalog], Evans, James Humphrey, [from old catalog] joint author · New York, Longmans, Green and co.; London, E. Arnold · leaf 64
SECTION ON A.B. … Fig. 11.—-Copper Furnace. partially converted into oxides. The calcined ore is now inthe form of a black powder, which is raked out of the furnace. 2. This powder is placed on the hearth of a second rever-beratory furnace, sometimes with the addition of slag derivedfrom the fine metal, and is…
Metal-work
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