502 



Tides of the Oceans 



solute values for the four waves. The following points were selected: two 

 at the west and east coast at 32°5'S. and two at 7-5° S., i.e. south of the gulf 

 of Guinea and of Cape San Rogue, where the greatest irregularities in the 

 basin occur. The most important waves seem to be the Kelvin wave travell- 

 ing northwards and the Poincare wave travelling southwards. The super- 

 position of all these waves gave, both as to phases and amplitudes, a tidal 



Fig. 207a. Theoretical tides of Atlantic Ocean. Full lines: co-tidal lines referred to moon- 

 transition through meridian of Grw., dashed lines: co-range lines of the semi-diurnal tide 

 M 2 in m (according to Hansen). 



picture which from 10°N. to 35° S. agrees very well with the values observed 

 at the coasts. If one goes from 10° N. into the N. Atlantic, the agreement 

 ceases. Perhaps it is possible to make the values agree by increasing the num- 

 ber of waves. This paper of Proudman is an attempt to compute co-tidal 

 lines and co-range lines which satisfy in all respects hydrodynamical principles 

 for an extensive ocean area from coast to coast. However, it is only an attempt 

 to derive the geographical distribution of the tides over the entire expanse 



