Per cent. of Oxides. | ------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ FeO. |16.20| 9.50| 1.50|60.40|23.90| 5.18| 1.08|37.86| 3.46| 1.44 Fe_{2}O_{3}. |68.55|76.47|84.81|26.08|61.60|82.71|80.55|43.26|78.91|77.74 Total. |84.75|85.97|86.31|86.48|85.50|87.89|81.63|81.12|82.37|79.18 ------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ Oxygen in Ore. ------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ Before experiment.|25.97|26.10|26.05|27.96|26.45|26.54|24.52|25.60|24.81|23.80 After experiment. |24.16|25.05|25.77|21.24|23.79|25.96|24.40|21.39|24.44|23.64 Difference. | 1.81| 1.05| 0.28| 6.72| 2.66| 0.58| 0.12| 4.21| 0.37| 0.16 ------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ Per cent. of oxygen reduced. ------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ oxygen reduced. | 6.93| 4.02| 1.07|24.03|10.02| 2.18| 0.49|16.44| 1.49| 0.42 ------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ Degree of Oxidation of the Ore after the Experiment. ------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ FeO. | ... | ... | ... |84.66| ... | ... | ... |18.40| ... | ... | Fe_{3}O_{4}. |52.20|30.61| 4.84|37.82|77.01|28.12| 3.88|62.72|11.14| 4.64| Fe_{2}O_{3}. |32.55|55.36|81.47| ... | 8.49|59.77|77.75| ... |71.23|74.54| Total. |84.75|85.97|85.97|85.97|85.97|85.97|85.97|85.97|85.97|85.97| ------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ ------------------+-----------------+-----------------------+-----------------+ The ore having | | | | been exposed to | Steam. | Water gas. | Carbon monoxide.| ------------------+-----------------+-----------------------+-----------------+ _Four Samples were Tested_.--I. The bottom layer, 1¼ in. thick; the color of ore quite black, with small particles of reduced spongy metallic iron. II. Layer above I., 4¼ in. thick; the color was also black, but showed a little purple tint. III. Layer above II., 5 in. thick; purple red color. IV. Layer above III., ore a red color. The analyses gave: