480 Dr. J. Robinson on Konig" s Theory of the 



B" 1 



*|? = _ / 2* R3 _, R6 ? )i% osin 2,1 



93 1 



and 



C^ 



Z= _( m+ 2 |R3 _ ^ -~»)^w sin 2tt- t 



+ 7rRWcos 2 27r--4- < 



Calculating the mean value of this force over the period t 

 we bee that the term involving sin 2ir- vanishes, 



i r*T f 



as -I Bin2w-<ft=0, 



T L T ' 



a»i 



. z=^^» ^| ,s*2,r'- 



c?e 





For the X component we have 



dt ~du ~da 

 Here again the only term remaining after taking mean 

 values is 



and thus 



1 



9 



If we with Konig suppose the motion to ta in the xz plane, 

 we have Y = 0. These values of X, Y, Z are the same as 

 those given bv Konig. 



