QUAItTZ FIBRES AND ITS TEMPERATURE COEFFICIENT. 



4'JU 



>| 



I 



X. 



5 



3 



o 



4 



Ji 



3-0 



01' 



200 



' M ) 



"empcrature CnCigr&de. 



Uiagritm II. Showing effect of changn of temperature on modulus of rigidity and on logarithmic 



decrement of torsional vibrations. 



Comparison of Rexnlts and Conclusion. 



The mean values of the modulus of toreional rigidity (n) and its temperature 

 coefficient between 15 C. and 100 C. (a), obtained by the observers mentioned at 

 the beginning of this paper, are collected together in the following table, which also 

 contains the values arrived at in the present research : 



