TABLES 41-44. 

 COMPRESSIBILITY, HARDNESS, CONTRACTION OF ELEMENTS. 



TABLE 41. Compressibility of the More Important Solid Elements. 



73 



Arranged in order of the increasing atomic weights. The numbers give the mean elastic change 

 of volume for one megabar (0.987 atm.) between 100 and 500 megabars, multiplied by io 5 . 



Stull, Zeitschr. Phys Chem 61, 1907. 

 TABLE 42. - Hardness. 



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

 TABLE 43. Relative Hardness of the Elements. 



Rydberg, Zeitschr. Phys Chem 33, 1900 

 TABLE 44. Ratio, p, ol 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, 0.36 ; glass, 0.23. Adams-Coker, 1906. 

 SMITHSONIAN TABLES. 



