. Transactions. ce demonstrated, unnecessarily)abandoned. Examination showed a hole 55 ft. deep, burnedthrough the center, leaving about 4 ft. of loose stock on thewalls. The furnace could have been saved by filling the holewith anthracite, and applying an extra volume of blast. Subsequent campaigns, so long as anthracite only was used, showed a tendency to center-circulation, although the stock-line diameter was reduced to 12 ft. Indeed, why should this not be the case, especially when dense, heavy, fine magnetite is vol. xxxv.—36 580 SPECIAL FORMS OK BLAST-FURNACE CHAROINU-APPARATUS. charged
. Transactions. ce demonstrated, unnecessarily)abandoned. Examination showed a hole 55 ft. deep, burnedthrough the center, leaving about 4 ft. of loose stock on thewalls. The furnace could have been saved by filling the holewith anthracite, and applying an extra volume of blast. Subsequent campaigns, so long as anthracite only was used, showed a tendency to center-circulation, although the stock-line diameter was reduced to 12 ft. Indeed, why should this not be the case, especially when dense, heavy, fine magnetite is vol. xxxv.—36 580 SPECIAL FORMS OK BLAST-FURNACE CHAROINU-APPARATUS. charged? The natural effect of a single bell, at least under theconditions above Btated, ie to render the outside ring of mate-rials more impervious to the ascending gases than the center,because only the Large pieces of fuel and stone roll to the center,while the ore stays about where it falls. This tendency to burn up through the middle was, however,very much reduced by using coke as a part of the fuel. The Fig. Distributes the charge in three ways :—1. In a large ring next to the furnacelining. 2. In a small ring. 3. In both a large and a small ring. The Durham Bell and Hopper. more rapid working thus effected may have been the secret ofthis improvement in results. Later, the single bell was replaced with the Bauman bellshown in Fig. 4, and afterwards Firmstones modification ofthe Bauman (see Fig. 5) was added. This improved designwas used at Glendon, Pa., a long time, and therefore, presum-ably, with satisfactory results. m ,
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
