77 



The distribution of cold and warm water April 6 to 10, at a depth 



of 50 meters, is sho^\^l on Figure 35. We now see that the southerly 



drift along the east side of the Bank of 1.4 knots per hour must have 



been Labrador current because of its extremely low temperature. 



The much warmer water, greater than 10° C, which lay about 35 



miles seaward of the continental edge was "Gulf Stream." The 



distribution of the salinity at the 50-meter level, as contained on 



Figure 36, supports the conclusions drawn from the foregoing figures 



of the set. 



SET II 



After an elapse of two weeks we repeated the survey of the area 

 just discussed in order to determine what changes, if any, had taken 



Sb SZ 5/ So A9 'JO 17 ■"*> 



Fig. 37. — Set II. Dynamic topographic map drawn from observations made at stations 652-673, 

 April 21-25, 1927. This map is read the same as an ordinary isotaric weather map 



place in the scheme of circulation around the Tail of the Bank. We 

 found the shallow depression in the sea surface still persisting in 

 about the same position it had had two weeks previously over the 

 southwest slope. A second depression, centere^fl about 50 miles 

 southeast of the Tail, was almost completely cut off from the Grand 

 Bank by a ridge of relatively high contour, which had developed since 

 the preceding survey, and was thrust from west to east, past the Tail 

 between the forty-third and forty-second parallels. The surface of 

 the sea on the eastern side of the Bank, between the forty-third and 

 forty-fourth parallels, was elevated, the dynamic contour of 728.85 

 72092—27 6 



