﻿10 Mr. A. R. McLeod on Unsteady Motion produced 



Comparison with the theoretical curves (figs. 2 & 3) 

 shows a marked departure in all cases but that o£ the 

 slow speed and small cylinder. The agreement with 

 theory improves as r—s~c, but there is still a large departure 

 at r/c = '9 for the large and middle cylinders, except at the 

 low speed. 



Vc w 



Again, it is noticeable that as the radius of the cylinder 

 increases, the departure from theory becomes more marked. 

 This might be expected as there is, near the axis, relatively 

 less constraint from the boundaries with the larger cylinders. 

 Accordingly, if we suppose an eddy of this kind rotating in 

 a lake of stationary water, and if instead of stopping the 

 cylinder wall we annihilate it, we expect the eddy to dis- 

 appear more quickly than if the stationary solid wall had 



