75 



of the Tail, thus recording a slope of about 30 centimeters in a dis- 

 tance of 35 miles. Calculation of velocities shows that a rapid 

 current of 1.4 knots per hour flowed toward the east at the outer 

 stations along the southwest slope, and an equally strong set to 

 the southward took place along the east side of the Bank about 

 45 miles north of the Tail. The current arrows on Figure 34 clearly 

 show the manner in which the current hugged the 100-fathom con- 

 tour to the Tail, where it split, one branch flowing for a short distance 

 to the westward and then bending to the northwest to overflow 

 the shaUow part of the shelf. The outer branch turned abruptly 



3^ 5Z ^\ 50 4-9 4e 



Fig. 34.— Set I. The direction and velocity of the currents, April 6-10, 1927. 



April 12-15 is also shown 



The drift of an iceberg 



back to the eastward at the fiftieth meridian and joined the more 

 voluminous masses of the Gulf Stream. Particular interest is attached 

 to two features of the circulation which were in process when this 

 picture was recorded: (1) a tendency on the part of the Gulf Stream, 

 as shown in the shape of the current arrows, to force itself in toward 

 the slope of the Bank; (2) the anticlockwise eddy seated over the 

 southwest slope of the Bank, which appears to have received its 

 life from the inner current on the north and also from the outer cur- 

 rent on the south. In such a case it had a mechanical source rather 

 than a hydrostatic cause. Its presence, however, was accountable 

 for the only berg that reached the Tail in 1927, to be carried to the 

 northwest, inshore, where it eventually melted. (See fig. 34.) 



