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 41
out directly; but if grey pig-iron is used, a 23 24 METAL-WORK preliminary refining is required, which practically convertsit into white by the removal of its impurities, chieflysilicon. This refining is done in a finery or furnace,as shown in Fig. 4. The hearth is about 4 feet square and18 inches… … Valve Fia. 4.—Refinery or Finery. angle of 30 degrees. The fuel used is coke. The blast impingeson the molten metal, and so forms an oxidizing atmosphere,which, whilst carrying off a portion of the carbon, reduces thesilicon by as much as 4 per cent. When the requisite degreeof purity is reached,…
Metal-work
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