34 



DR. F. HORTON ON THE EFFECTS OF CHANGES OF TEMPERATURE 



Temperature scale for Silver. 



2-45 



244 



243 



242 



"5241 



240 



2-33 



2-3 



90 100 no" 



50P &f 7<r 80 



Temperature scale for Gold. 



Diagram VII. Showing the effect of temperature on the modulus of rigidity of gold and of silver wire. 



The value of the rigidity modulus at 15C. for gold was found to be 



n K = 2 '44 5 3 x 10 11 dynes per sq. centim. 

 and the " temperature coefficient " = '0003299. 



The curve obtained by plotting the values of the logarithmic decrements at the 

 various temperatures was similar to that obtained for copper and showed that the 



