39* 



Yountfs Modulus for Crystals, 



[Mar. I 1 .' 



Table of Values of Young's Modulus. 



* Cast bismuth. The beam cut parallel to a natural crystalline cleavage of the 

 metal. 



t The greatest value is that obtained from obserrations taken in rapid succes- 

 sion. 



J Relation of tne faces of the beam to the crystallographic axes not known. The 

 specimens marked (b) are cut at right angles to those marked (a) . 



A very black opaque crystal from the Ural ; (a) cut parallel to the side of 

 the prism, (6) normal to the sides. 



|| Parallel to diagonal of the cubic crystal. 



T Parallel to face of cube. 



** Parallel to sides of prism. 



ft A very close-grained oilstone. 



+t Parallel to the principal cleavage. 



