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Gongs and Cymbals

The secret and is nearly all that could be desired, except the hard brittle bronze used for making gongs that, like the copper die metals, it is rather and cymbals , seems to be solved by the fact brittle for certain castings. (See No. 3437.) that the bronze of which these instruments are Substituted for copper in these connections, made, consisting of copper alloyed with about cadmium appears to confer greater hardness 20 per cent. of tin, and almost as brittle as and toughness, and, up to a certain point, pro- glass at ordinary temperatures, becomes as inotes fusibility. 9 parts of tin, 1 part of an- malleable as soft iron, if worked at a dull red timony, and 1 part cadmium, furnish a very heat.

This discovery was recently made in hard and tough metal of a compact, homo- Paris, by M.M. Julien and Champion, the geneous structure, which casts without shrink-result of experiments at the Paris Mint. age, forming a perfect die with a smooth, bright face. It melts at about the melting advance has lately been made in the con-