ON TIIK MODULUS OF rolJSlo.N.M. IMCIDITY OF MKTAL WIKKS. 



Temperature Centigrade. 



Diagram I. Showing the effect of change of temperature on the modulus of rigidity of soft iron 



and of copper wire. 



The logarithmic decrements of the oscillations at the various temperatures are given 

 in Table II. 



TABLE II. Copper Wire. 



