30 



101 



VELOCITY OF 



iW SOLiDS. 



The numbers given in this table refer to the velocity of sound along a bar of the substance, and hence depend on the 

 Young's Modulus of elasticity of the material. The elastic constants of most of the materials given in this table 



^ vary through a somewhat wide range, and hence the numbers can only be taken as rough approximations to the 

 velocity which may be obtained in any particular case. When temperatures are not marked, between 10 and 20 

 is to be understood. 



SMITHSONIAN TABLES. 



