TABLES 80, 81 . 



ELASTIC MODULI. 



TABLE 80. Variation of the Rigidity oi Metals with Temperature.* 



The modulus of rigidity at temperature / is given by the equation n t = (i -)- at + # 2 -f- yf). 



TABLE 81. Ratio p of Transverse Contraction to Longitudinal Extension under Tensile Stress 



(Poisson's Ratio). 



* According to the experiments of Kohlrausch and Loomis (Pogg. Ann. vol. 141), and of Pisati (N. Cim.fo) vols. 4,5). 

 SMITHSONIAN TABLES. 



76 



