Aluminum Alloys
The following alloys comprise most of those which are in common use. Such alloys as have been made with other metals have not as yet been recognized as having any practical value in arts or manufactures. Aluminum. Silver. Copper. Gold. Tin. Aluminum silver, for fine instruments . . . . . 96 4 Alloy, for watch-springs, etc . . . . . 5 90 Aluminum bronze, hard malleable gold color . . . . 10 90 Aluminum bronze, soft malleable gold color . . . . 5 95 Aluminum bronze, medium malleable greenish gold . 7 1/2 92 1/2 Solid copper castings . . . . . 1 99 Aluminum copper, for engraving . . . . . 2 98 Alloy, hard as coin-silver . . . . . . 5 95 Alloy, extremely hard . . . . . 50 50 Alloy, ductile, hard, greenish . . . . . 99 1 Alloy, brittle, crystalline . . . . . 90 10 Alloy, harder than aluminum and polishes well . . . 95 5 Alloy, similar to 14-carat gold . . . . . 10 85 5 Gun-metal, with aluminum alloy, equal to cast-steel in strength; good for bells, etc . . . . . 2 90 10