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Scientific American, Vol. 46, No. 22 (1882) (1882)
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d is supported nearest the ends of the furnace having annular flanges to Fire brick or angle irons are used to project the falling ore by a spider that encircles and radiates from the air pipe, M. This flue, H, revolves with the furnace, A BC. into the body of the furnace, also covering the space… … WITHERELL AND ORES. © 1882 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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