The Probert Encyclopaedia of Science & Technology

DELTA METAL

Delta Metal is a variety of brass containing 55 percent copper, 41 percent zinc and 4 percent various other metals. It was invented in the 19th century (patented in 1883 - 1884) by Dick and the original delta metal contained a small portion of iron. Delta metal was used in Geneva for making watch cases in 1885.
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