. Transactions. s. •-^ *.:- -f. / ^^•^ :^iS% Fig. 6.—Typical oxide films axd spots in gux-metal broxze casting, etchedWITH ammonia and hydrogex peroxide. X 400. G. F. COMSTOCK 391. Fig. 7.—Very unsound spot in bronze casting with 12 per cent, tin and 6 per CENT, zinc, etched LIKE FiG. 6. X 100.

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries