68 



Table 35. 

 STRENGTH OF MATERIALS. 



The strength of most materials varies so that the following figures serve only as a rough indication of the strength of a 



particular sample. 



TABLE 36 (a). — Metals. 



TABLE 35(b). — Stones.* 



* Data furnished by the U. S. Geological Survey. 



TABLE 35(c). -Brick. 



Authority of Wertheim. 



* Data furnished by the U. S. Geological Survey. 



TABLE 35 (d). — Concretes.* 



* Data furnished by the U. S. Geological Survey. 

 Smithsonian Tables. 



