167 



+^ 



0- 



F 



-^-J 



~i 1 1 1 — r 



Lunar Hours 



ii--m 

 in-v 

 IE- 



FlGU 



loo, OOO 



RE 52.— Frictionless tides and currents in connecting canal 



500^00 feet. 



330. IXdes and currents at the middle of a connecting canal. — At the 

 middle of a canal, x=%L and equation (228) becomes: 



y,n=Ao COS (at + ao) sin }^7/sin 7 + ^1 cos (at + ai) sin J^T/sin 7 



Since sin 7 = 2 sin % 7 cos ji 7 this equation reduces to: 



ym=y2[Ao cos {at-^ao)-\-Ai cos (a^+aOJ/cos jiy (237) 



