. Transactions. ^^^ Fig. 2.—Badly oxidized copper, showing oxide crystals and eutectic, un-etched. X 200. G. F. COMSTOCK 389 t • r^*^^ ^^ ^^^ ^ f 1 V 1 -A 4^ Fig. 3.—Tin-oxide crystals ix oxidized copper treated with 10 per cent, tin, uxetched. x ::i,^ V Fig. 4.—Same specimen as Fig. 3. after etching with ammonia and~hydrogen ^peroxide. x 100. 390 NON-METALLIC INCLUSIONS IN BRONZE AND BRASS % f ?• M- i . T »? %? \ 5 «* •- T^ % ./ *- * ^ ^ . ^ 1 ??^, l\ - . V ? \ «» . Fig. 5.—Tin-oxide crystals ix another heat of bronze made as in Fig. 3 but CAST IX a chill instead OF SAND, UXETCHED. X 40
. Transactions. ^^^ Fig. 2.—Badly oxidized copper, showing oxide crystals and eutectic, un-etched. X 200. G. F. COMSTOCK 389 t • r^*^^ ^^ ^^^ ^ f 1 V 1 -A 4^ Fig. 3.—Tin-oxide crystals ix oxidized copper treated with 10 per cent, tin, uxetched. x ::i,^ V Fig. 4.—Same specimen as Fig. 3. after etching with ammonia and~hydrogen ^peroxide. x 100. 390 NON-METALLIC INCLUSIONS IN BRONZE AND BRASS % f ?• M- i . T »? %? \ 5 «* •- T^ % ./ *- * ^ ^ . ^ 1 ??^, l\ - . V ? \ «» . Fig. 5.—Tin-oxide crystals ix another heat of bronze made as in Fig. 3 but CAST IX a chill instead OF SAND, UXETCHED. X 400.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
