* Specification Values: Alloy " No. 12": A. S. T. M. B26-18T, tentative specified minimums for aluminum, copper, 

 t Quenched in water from 475° C. after heating in a salt bath. Modulus of elasticity Jor Duralumin averages 

 7000 kg/mm" or 10,000,000 Ib/in^. 



t Specification values: Aluminum castings; U. S. Navy 49 Al, July i, 1915 (Impurities: Fe max. 0.5, Si max. 0.5). 



Smithsonian Tables. 



