. Transactions. Fig. 5.—Structure of Bar No. 1, Magnified 50 Fig. 6.—Structure of Bar No. 4, Magnified 50 Diameters. ago, by John Jermain Porter, in which he plotted silicon and com-bined carbon; but as he made no statement as to the size of the castingsfrom which these results were obtained, it is probable that this factor GRAFTON M. THRASHER 195 was not kept constant, which of course would account for a great manyirregularities. Also, no reference was made to the effect of the total carbonon the combined-carbon content, which, as may be seen above, is highlyimportant. For the pu
. Transactions. Fig. 5.—Structure of Bar No. 1, Magnified 50 Fig. 6.—Structure of Bar No. 4, Magnified 50 Diameters. ago, by John Jermain Porter, in which he plotted silicon and com-bined carbon; but as he made no statement as to the size of the castingsfrom which these results were obtained, it is probable that this factor GRAFTON M. THRASHER 195 was not kept constant, which of course would account for a great manyirregularities. Also, no reference was made to the effect of the total carbonon the combined-carbon content, which, as may be seen above, is highlyimportant. For the purpose of comparing the natural chill with that producedwhen cast iron is poured against an iron chiller, a test was made whichconformed to that used in a car-wheel foundry, using the same patternand chill box. A ladle of very hot low-carbon iron was treated withsufficient 50 per cent, ferro-silicon, as calculated from the chart, to pro-duce the same degree of chill as that of the iron used in car wheels. Itwas necessary to allow the metal to cool for several minutes
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
