. First century of national existence; the United States as they were and CASriNG PIU BLAST FURNACE. CASTING STEEL INGOTS. IRON. 33 and fuel that fill the interior. For ores thatmelt easily and fast they are made steeperthan for those which are slowly boshes open below into the hearth—thecentral contracted space which the Frenchname the crucible of the furnace. Thewalls of this arc constructed of the most re-fractory stones of larsfe size, carefully selectedfor their power to resist the action of fire,and seasoned by exposure for a year or moreafter being taken from t
. First century of national existence; the United States as they were and CASriNG PIU BLAST FURNACE. CASTING STEEL INGOTS. IRON. 33 and fuel that fill the interior. For ores thatmelt easily and fast they are made steeperthan for those which are slowly boshes open below into the hearth—thecentral contracted space which the Frenchname the crucible of the furnace. Thewalls of this arc constructed of the most re-fractory stones of larsfe size, carefully selectedfor their power to resist the action of fire,and seasoned by exposure for a year or moreafter being taken from the quarry. Beinc;the first portion to give out, the stack is builtso that they can be replaced when hearth is reached on each side of thestack by an arch, extending in from the out-side. On three sides the blast is introducedby iron pipes that pass through the hearth-Btones, and terminate in a hollow tuyere,which i-i kept from melting by a current ofwaer brought by a lead or block-tin made to flow continually through andaround its hollow shell. The fourth side isthe fro
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Keywords: ., bookauthorhodgejam, bookcentury1800, bookdecade1870, bookyear1874
