STI;I:X<;TII OF \vitm <, in IKON. 



The third column in the following table contains some 

 values for the modulus of rigidity, as obtained from 

 torsion experiments : 



Elastic Constants for Wrought Iron. 



30 



c 20 



10 



200 



800 



1OOO 



4OO 600 



, Temperatures, Deg. Fah. 



FIG. 172. ULTIMATE STRENGTH OF WROUGHT IRON AT DIFFERENT TEMPERATURES 



(JOHNSON). 



182. Wrought Iron in Shear and Torsion. Com- 

 paring the values of shearing strengths, as obtained from 

 direct shearing tests, with the tension strengths of the same 



