TABLES 38-39. ji 



ELASTIC MODULI. 



TABLE 38. 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 area (kg. per sq. mm.) by the number representing the change of angles on the 

 non-stressed faces, measured in radians. 



TABLE 39. Variation of the Rigidity Modulus with the Temperature. 



n t = n (i at 0f 2 7/ 3 ), where t = temperature Centigrade. 



SMITHSONIAN TABLES. 



* Modulus of rigidity in 10" dynes per sq. cm. 



