Brard 
Hence (5.24) does not hold. 
1 Let C denote a closed contour around the stern post. Let 
rae denote the port side of y and pare its starboard side. C 
intersects ae at Ms Z De, at M, and Ds at M, . The circula- 
tion of the fluid velocity V in that circuit ig null. Hence, if all the 
points of C are close to the stern-post 
0 =[orng, ) - "iM, | + [eras ) = ora, ) Teor, ) - Orta 
1 a ] ] 2 z 
where 
1 sac ! re) l ! 
+ =f MM!) —9— ad (M') (5, 26) 
! ! 
If the normal to rae is in the direction from bes ¥ to Dine » we obtain 
2 1 
ui(B) = 45 (B) = (B), (5.27) 
H, being the determination of uw on a ,» while Uo is its determi- 
nation on 
Similarly, by taking 7, on 2, , inthe positive z -di- 
1 
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