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Another (Melt in a crucible oz)

Melt in a crucible 4 oz. of copper, and when fused, add 2 oz. of zinc; they will combine, and form a very beautiful and useful alloy, called Prince Rupert's metal.

Bronze.

Melt in a clean crucible 7 lbs. of pure copper; when fused, throw into it 3 lbs. of zinc and 2 lbs. of tin. These metals will combine, forming bronze, which, from the exactness of the impression which it takes from a mould, has, in ancient and modern to 14 oz.

Gun-metal.

Melt together 112 lbs. of Bristol brass, 14 lbs. of spelter, and 7 lbs. of block tin.