A few of the most useful and well known copper alloys are:

Aluminum bronze, copper 90 per cent, aluminum 10 per cent.

German Silver, copper 62 per cent, zinc 20 per cent, nickel 18 per cent.

Babbit metal, copper 10 per cent, antimony 22 per cent, tin 68 per cent.

Brittania metal, tin 90 per cent, antimony 8 per cent, copper 2 per cent.

Dentists' alloy, used for filling teeth, silver 50 per cent, tin 45 per cent, copper 5 per cent.

Muntz metal, copper 60 per cent, zinc 40 per cent.

There are many various agencies that are endeavoring to standardize the alloys for certain specific uses, the most prominent of these being the United States government and the different engineering societies. The Society of Automobile Engineers has adopted the following alloys as standard in the manufacture of automobiles: Hard bronze, 87 to 88 per cent copper, 9.5 to 10.5 per cent tin, and 1.5 to 2.5 per cent zinc; Gear bronze, 88 to 89 per cent copper, 11 to 12 per cent tin, 0.15 to 0.30 per cent phosphorus. The hard bronze is identical Math the United States government specifications, and is offered as a general utility bronze for use under severe working conditions of heavy pressure and high speed. The gear bronze is known in the trade as English gear bronze and is especially useful where high speed and quiet running are necessary.