Tables 75-77. 



EFFECT OF RELATIVE COMPOSITION ON THE STRENGTH OF ALLOYS 



OF COPPER, TIN, AND ZINC* 



TABLE 75. — Copper-Tin Alloys. (Bronzes.) 



TABLE 76. — Copper-Zinc Alloys. (Brasses. 



TABLE 77. — Copper-Zinc-Tln AIloys.§ 



• These tables were compiled from the results published by the U. S. Board on Testing of Metals. The numbers 

 refer to unwrought castings, and are subject to large variations for individual specimens. 



t The crushing strengths here given correspond to lo per cent compression for those cases where the total com- 

 pression exceeds that amount. 



t For crushing strength, lo per cent compression was taken as standard. 



§ This table covers the range of triple combinations of these three metals which contain alloys of useful strength 

 and moderate ductility. The weaker cases here given, and those lying outside the range here taken, are generally weak 

 and brittle. The absolute strength may of course be varied by the method of fusing and casting, and certainly can be 

 greatly increased by working. The object of the table is to show relative values, and to give an idea of the strength of 

 sound castings of these alloys. 



Smithsonian Tables. 



73 



