own into the crucible. by the use to which the steel is to be put, and at the temperature to fall to about 400° F., the decrease caus- Tbe ascending current of hot gas heats the descending same time secure certain advantages which the pres- ing the vapor to oxidize. The gas passes from the con-… … THE MANUFACTURE OF SPIEQELEISEN FROM ZINC ORE RESIDUUM. the charges amounting to about 3,000 pounds daily, or lower parts are melted and tapped off. The molten quent processes of rolling, alloys of iron and manganese every 24 hours. The charges of residuum and lime- metal is tapped off at the…
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