by means of a Double Pendulum, 

 Graph iii. 



573 







_ 







A 













/ 



A 

























X**"^ 













































y.% 









10 20 30 40 50 



Electriccvl case. 



Values of 7 ; -; and a. 



60 



Serial ISo. 



1 



o 



3 



4 

 5 



6 



7 



8 



9 



10 



11 



y per cent. 







5-3 

 10-6 

 15-7 

 19-8 

 247 

 30-5 

 34-6 

 42-6 

 49-5 

 52-8 





 •05 



06 



•129 -1 



•193 -152 



•260 -19 



•313 -25 



•393 -305 



•464 -35 



•601 -452 



"757 '55 



•860 -6 



-oductions of the photo- 



Fiors. 1 to 20 (PI. XT.) arerepr.. 

 graphs obtained with the above apparatus under various 

 conditions ; figs. 1 to 10 represent the oscillations of the 



