TABLES 78-81 . 



TABLE 78. Interior Friction at Low Temperatures. 



IOI 



C is the damping coefficient for infinitely small oscillations; T, the period of oscillation in sec- 

 onds; N, the second modulus of elasticity. Guye and Schapper, C. R. 150, p. 963, 1910. 



TABLE 79. Hardness. 



From Landolt-Bbrnstein-Meyerhoffer Tables : Auerbachs, Winkleraann, Handb. der Phys. 1891. 

 TABLE 80. Relative Hardness of the Elements. 



Rydberg, Zeitschr. Phys Chem 33, 1900 



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



(Poisson's Ratio.> 



From data from Physikalisch-Technischen Reichsanstalt, 1907. 



p for: marbles, 0.27; granites, 0.24; basic-intrusives, 0.26; glass, 0.23. Adams-Coker, 1906. 

 SMITHSONIAN TABLES. 



