The New Student's Reference Work/Alloy

Alloy', a mixture of two or more metals melted together. Some of the metals, when combined with other metals, are rendered more serviceable for certain uses. Thus alone is not fit for castings, and is too tough to be easily worked by tools, but when alloyed with, forming , it can be cast, rolled or turned. and, also, when pure are very soft and easily worn out. They are hardened by alloying them with other metals in different proportions. The silver coins of the are made up of nine parts of silver and one of copper, while the gold coins consist of nine parts gold and the other part is divided into one-quarter silver and three-quarters copper. Alloys are generally harder and much more fusible than would be indicated by the hardness and fusibility of the component metals. Besides the alloys that have been mentioned, some important ones are bell-metal and consisting of copper and ; type-metal, containing  and  and sometimes tin also; German-silver, composed of copper,  and zinc; and solder, which is ordinarily made of lead and tin. Alloys of which one metal is are called.