. Transactions. to 800° C. The first,Fig. 7, shows the effect of hydrogen on refined copper; the second. Fig. 8,the want of effect of hydrogen on copper that has been deoxidized byboron-sub oxide; the third, Fig. 9, the effect of carbon dioxide on refinedstrip copper; and the fourth. Fig. 10, the effect of nitrogen on similarmaterial. The larger the amount of oxygen, the greater is the effectof reducing gases. For instance, two lots of strip copper that had beentaken from bars coming from the same furnace charge, one per cent, of oxygen and the other per cent, of oxygen,
. Transactions. to 800° C. The first,Fig. 7, shows the effect of hydrogen on refined copper; the second. Fig. 8,the want of effect of hydrogen on copper that has been deoxidized byboron-sub oxide; the third, Fig. 9, the effect of carbon dioxide on refinedstrip copper; and the fourth. Fig. 10, the effect of nitrogen on similarmaterial. The larger the amount of oxygen, the greater is the effectof reducing gases. For instance, two lots of strip copper that had beentaken from bars coming from the same furnace charge, one per cent, of oxygen and the other per cent, of oxygen, werereduced in tensile strength by annealing for 1 hr. in an atmosphereof illuminating gas at 600° C. the amounts here shown. Sample Original Tensile Strength,Lb. per Sq. In. Tensile StrengthAfter Gassing,Lb. per Sq. In. Orig inal Elongationin 2 In.,Per Cent. Elo ngation AfterGassing,Per Cent. L-1 L-11 34,00033,500 24,350 28,150 VOL. LX.—22. 338 ACTION OF REDUCING GASES ON HOT SOLID COPPER. Fig. o. Fig. b. Plate I.—Figs. 2 to 5 etched with ammonia and hydrogen peroxide. X 75. DISCUSSION 339 This indicates a reduction of and 16 per cent., respec-tively, in tensile strength; and 64 and 44 per cent., respectively, inelongation. The presence of arsenic apparently protects copper from the actionof reducing gases to some extent, while the presence of nickel has the
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
