7^ Tables 49-52. 



COMPRESSIBILITY, HARDNESS, CONTRACTION OF ELEMENTS. 



TABLE 49. — Compressibility of tbe More Important Solid Elements. 



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 10^. 



StuU, Zeitschr. Phys Cliem. 6i, 1907. 

 TABLE 60.— Hardness. 



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



TABLE 61.— Relative Hardness of tbe Elements. 



Rydberg, Zeitschr. Phys. Chem. 33, 1900. 



TABLE 52.— Ratio, p, of Transverse Contraction to Longitudinal Extension under Tensile Stress. 



(Poissoii'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. 



