. Transactions. 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