ish us with so much leadfrom ores which are decidedly inferior to those inAmerica for richness in metal ; and, beside this, themines in that country are more difficult to work. Weshould rather be exporters than importers of thismetal. The following are illustrated descriptions of leadfurnaces… … the hearth is about 8 feet long and 6 feet wide, and isusually formed of fused slag, obtained from thesmelted ore itself. About the center of the hearththere is a depression for the fused metal to collect in,and there is an opening to the outside for a tap hole,T, to draw off the smelted metal into…
Patents · Purpose · Claim · Ment · Iron · Combination · Purpose set · Lead ore · India rubber · Scientific American · Letters patent · Patent office · Dark blue · Sulphuric acid · Address munn · Purposes set
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