526 Mr. H. S. Allen on the Motion of 



falling in vacuo is the same as the ratio of the effective force 

 on the sphere to its weight. 



/_ W-R 



•"' 9~ W ' 



R 



=F=>> 



































































































































































































































































S3 



eg 































































"3 































































CO 



o3 

















i 

















«4H 



o 

































? 



^ 

















\ 

















1 



CO 







\ 



s 









\ 

















to 









\ 









\ 































































































\ 



v 





































J 













































































"?3S U3d »3 



where R represents the resultant upward force due to the 

 pressure of the fluid. If we subtract from R the weight of 

 fltiid displaced by the sphere, we obtain the force due to the 



