. The Iron and steel magazine. ld air through incandescentcoke, so regulating the pressure that in the fuel chamber onlycarbon monoxide is formed, combustion to carbonic acid beingcompleted in the space above the sink head. Metallurgical Notes and Comments 549 The original article reproduces photographs of four ingotscast bv this method, which show ahiiost complete freedom frompipes. The weight and amount of discard necessary with eachof these ingots were as follows: No. i, weight gross tons,discard per cent; No. 2, weight i 7 tons, discard per cent;No. 3, weight tons, disca
. The Iron and steel magazine. ld air through incandescentcoke, so regulating the pressure that in the fuel chamber onlycarbon monoxide is formed, combustion to carbonic acid beingcompleted in the space above the sink head. Metallurgical Notes and Comments 549 The original article reproduces photographs of four ingotscast bv this method, which show ahiiost complete freedom frompipes. The weight and amount of discard necessary with eachof these ingots were as follows: No. i, weight gross tons,discard per cent; No. 2, weight i 7 tons, discard per cent;No. 3, weight tons, discard per cent; No. 4, weight , discard per cent. The accompanying illustrations show the arrangement foringots from 10 to 60 tons. Fig. i is an end elevation, Fig. 2 aside elevation and Fig. 3 the plan. The method of operating isas follows: The chamber K is filled to the top with pieces of hardcoke about the size of a mans fist. About an hour before theingot is poured the fuel is brought to redness by means of a. Fi G. 3. Plan gentle blast, the fiame which escapes at A being used to warmthe mold and more particularly the refractory lining of the before the steel is poured the apparatus is drawn backout of the way and at the same time the full pressure of blast isput on, so that by the time the mold is full, in fifteen to twenty-five minutes, the fuel is at a bright red heat, ready to be replacedover the mold. As may be seen from the illustrations, the ap-paratus is placed on a carriage, which can cjuickly and easily bemoved forward or back. As cold blast is used the blower can beplaced close to the casting pit, so that the whole arrangementis very simple and compact. 55© The Iron and Steel Magazine Iron Ore Analysis at Lake Superior Mines.* — The idea ofcompiling the methods used in the laboratories of the iron miningcompanies of the Lake Superior district in the analysis of ironores was suggested by the work of Francis G. Phillips on Meth-ods for
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectiron, bookyear1898
