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Scientific American, Vol. 26, No. 11 (March 1872) (1872)

leaf 3

An illustration from Scientific American, Vol. 26, No. 11 (March 1872), 1872, leaf 3
s, where, under a heavy heat,more sulphur is driven off, and the silica or gangue matter ismade to unite with the oxide of iron to form a slag. At theend of the smelting, some eight or ten tuns are thus reducedto one called matte, containing from $1,500 to $2,000 inthe precious metals, and from… … THE COMBA SCXTEA BRIDGE-MONT CENIS RAILWAY. © 1872 SCIENTIFIC AMERICAN, INC March 9, 1872.] Jfrbnttffc JlMtat 163 calcining furnaces, capable of reducing from twenty totwenty-five tuns of ore per day. The tailings, which areconcentrated along the streams, and are also sold to this es-tablishment,…

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