100 



TABLES 76-77. 

 ELASTIC MODULI- 



TABLE 76. Rigidity Modulus 



If to the four consecutive faces of a cube a tangential stress is applied, opposite in direction on 

 adjacent sides, the modulus of rigidity is obtained by dividing the numerical value of the tangential 

 stress per unit per sq. mm.) by the number representing the change of angles on the 



non-stressed faces, measured in radians. 



TABLE 77. -Variation of the Rigidity Modulus with the Temperature. 

 * = n<> ( i a/ ft/' 2 yt' 4 }, where / = temperature Centigrade. 



SMITHSONIAN TABLC*. 



* Modulus of rigidity in io dynes per sq. cm. 



