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Iron, Copper, and Zinc

An alloy consisting of 10 parts cast iron, 10 copper, and 80 zinc, does not adhere to the mould in casting, and it is of a beautiful lustre when is that of green gold. With 10 per cent. of gold, the composition is rendered crystalline.

In combining aluminum with copper, the latter must be melted first, and the former added bination of 10 parts aluminum and 90 parts gradually in small portions at a time. A com- A comcopper produces a fine aluminum bronze, which, however , is brittle after the first mixing; it increases in strength and tenacity only filed and polished. The least fusible metals after successive fusions, but with the loss, are melted first, and the zinc last, in making each time, of a little aluminum. This bronze it.