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 35 (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. 



