Transactions . Fig. ,, percent. Fig. , 0.»7 per cent. ;O, , per Fig. , per , , per ,, per V.—Samples from Heats G and H. Fig. , , per cent. All Sections Magnified 140 Diameters- OVER-OXIDATION OF STEEL. 447 Heat H:—47,000 lb. of metal were blown soft and Test 18 wastaken. An analysis on Test 18 showed : C, per cent.; O, per cent. Heat G, 1,000 lb. of ore were added to the vessel, aud Test19 was taken two minutes after. Test 19 analyzed : C, per cent.; O,

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Transactions . Fig. ,, percent. Fig. , 0.»7 per cent. ;O, , per Fig. , per , , per ,, per V.—Samples from Heats G and H. Fig. , , per cent. All Sections Magnified 140 Diameters- OVER-OXIDATION OF STEEL. 447 Heat H:—47,000 lb. of metal were blown soft and Test 18 wastaken. An analysis on Test 18 showed : C, per cent.; O, per cent. Heat G, 1,000 lb. of ore were added to the vessel, aud Test19 was taken two minutes after. Test 19 analyzed : C, per cent.; O, and per cent. After holding rive minutes longer, the ore still working in the bath,Test 20 was taken, which gave the following analysis: C, percent.; O, per cent. Slag taken from this heat contained per cent. SiO.„ showingthat the ore was passing into the slag as fast as melted. OrdinaryBessemer slags contain 60 to 62 per cent. Si02. Note micrographs 18,19, and 20, Plate V. The oxides found withthe microscope check with those found by chemical analysis. Large

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries