A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . give a blast furnace,of any determinate height fixed upon, the largest possible capacityit is capable of receiving, while remaining free from any distortionof form, likely to give a place for minerals to lie out of the way ofthe action of the upward gaseous current; when the height exceedsthe proportion to its greatest diameter indicated in the figure, anunnecessary sacrifice in its capacity is the only loss entailed. The height above the mouthmust be regulated
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . give a blast furnace,of any determinate height fixed upon, the largest possible capacityit is capable of receiving, while remaining free from any distortionof form, likely to give a place for minerals to lie out of the way ofthe action of the upward gaseous current; when the height exceedsthe proportion to its greatest diameter indicated in the figure, anunnecessary sacrifice in its capacity is the only loss entailed. The height above the mouthmust be regulated by the kind of hopper used for cliarging, where it is intended to carryoff tlie gases. Doubtless when the true principle of collecting these gases without injury to the blastfurnace becomes more generally known, attention will be directed to the easiest and mostconvenient mode of introducing the minerals. Tlie conical charger has only one disadvan-tage, that namely of allowing a great waste of gas during the charging; probably some kindof revolving hopper may be contrived to remedy this defect. It is of course assumed that 346. 644 IRON. the furnace is supplied with a proper quantity of blast, and of a density proportionable tothe diameter across the tuyeres, so as to maintain a vigorous combustion of the fuel to tljevery centre of the hearth, the top of which is indicated by the letters e e, for unless this isattained, a cold cone of minerals will remain in the centre, and produce derangementswiiich no degree of perfection in the form of the furnace in the higher region can remove. Thevry of the blast furnace.—Analyses of the gases from a furnace at Alfreton in Der-byshire, at various depths below the surface, gave to Messrs. Bunsen and Ilayfair the re-sults embodied in the subjoined table. The furnace was supplied with 80 charges in thecourse of 24 hours, each charge consisting of 390 lbs. of coal, 420 lbs. of calcined ironstone,and 170 lbs. of limestone, the product being
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
