. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. wider at bottom than at top. Its dimensions vary with the magnitude of the 5 feet high, its width at the level of the tuyere or blast-hole may be from 20 to 22inches. From 250 to 300 cubic feet of air per minute are required for the working ofsuch a cupola. For running down 100 pounds of iron, after the furnace has beenbrought to its heat, 48 pounds of ordinai-j- coke are used; but with the hot blast muchless will suffice. The furnace requires feeding with alternate cha
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. wider at bottom than at top. Its dimensions vary with the magnitude of the 5 feet high, its width at the level of the tuyere or blast-hole may be from 20 to 22inches. From 250 to 300 cubic feet of air per minute are required for the working ofsuch a cupola. For running down 100 pounds of iron, after the furnace has beenbrought to its heat, 48 pounds of ordinai-j- coke are used; but with the hot blast muchless will suffice. The furnace requires feeding with alternate charges of coke and ironevery 8 or 10 minutes. The waste of ii-on, by oxydization and slag, amounts in mostfoundries to fully 5 per cent. For carrying off the burnt air, a chimney-hood is commonlyerected over the cupola. See Foundry. The double-arched air or wind-furnace used in the foundries of Staffordshire for melt-ing cast-iron has been found advantageous in saving fuel, and preventing waste by requiies fire-bricks of great size and the best composition. The main central key-stone is constnicted of
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
