. First century of national existence; the United States as they were and st of those ordinary la-borers. The business, moreover, has beengreatly simplified and its scale enlarged bythe substitution of mineral coal for charcoal—•the latter fuel, indeed, could never have beensupplied to meet the modern demands of themanufacture. Blastfurnaces are heavy structures of stonework, usually in pyramidal form, built upona base of 30 to 45 feet square, and from 30to CO feet in height. The outer walls, con-structed with immense solidity and firmlybound together, inclose a central cavity,which ext
. First century of national existence; the United States as they were and st of those ordinary la-borers. The business, moreover, has beengreatly simplified and its scale enlarged bythe substitution of mineral coal for charcoal—•the latter fuel, indeed, could never have beensupplied to meet the modern demands of themanufacture. Blastfurnaces are heavy structures of stonework, usually in pyramidal form, built upona base of 30 to 45 feet square, and from 30to CO feet in height. The outer walls, con-structed with immense solidity and firmlybound together, inclose a central cavity,which extends from top to bottom and islined with large fire brick of the most refrac-tory character, and specially adapted in theirshapes to the re(piired contour of the form of this cavity is circular in its hori-zontal section, and from the top goes on en-larging to the lower portion, where it beginsto draw in by the walls changing their slopetoward the centre. This forms what arecalled the boshes of the furnace—the partwhich supports the great weight of the ores. CASriNG PIU IKUN.
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Keywords: ., bookauthorhodgejam, bookcentury1800, bookdecade1870, bookyear1874
