112 



carried back to the eastward in the form of a counterset, separated 

 from the westerly moving stream inshore by a strip of water about 

 10 miles in width and with a temperatm'e higher than 1°. The 

 fourth sketch of this set of observations, April 29 to May 5 (fig. 52, 

 p. Ill), illustrates the distribution on the surface around the Tail of 

 the lightest water. 



The lightest water, which has been inclosed in a shaded area, 

 extended parallel with the slope some 35 miles to the seaward of 

 the 100-fathom contour and had heavier water on either side. Light 

 water also was found in over the Bank itself. 



SET II 



A hollow in the sea surface, the center of which was 10 dynamic 

 centimeters lower than at any other point around the Tail, is to be 



'WwS* 



-5i £.2. 51 50 4? ^t 



Fig. 53.^Set II. Dynamic topographical map 



noted on Figure 53. The same trough of 728.70 dynamic meters 

 that was recorded around the Tail of the Bank two weeks earlier is 

 seen here stretched along the slope. The sea surface was relatively 

 high in over the Bank and offshore at the outer stations, all of which 

 conditions agree with those previously observed this season. 



The oceanic situation for May 18 to 20 (fig. 53) reveals the fact 

 that an important change had taken place since the first week in 

 May (fig. 49). These two figures show that the spacious vortex 

 observed in the sea surface off the southwest slope April 29 to May 5 

 had been pushed up against the edge of the Bank by a force acting 



