78 



dynamic meters projecting in to the 100-fathom curve. The current 

 velocities on Figure 38, when compared with those of two weeks 

 previous (fig. 34) show a considerable slackening, except south of the 

 Tail, where the outer current bent back toward the southwest at the 

 very rapid rate of 1.7 knots per hour. There is also evidence that the 

 outer current as a whole had pressed in more closely toward the slopes 

 of the Grand Bank, especially on the east side of the latter, between 

 the forty-fourth and forty-third parallels, where the cold water was 

 probably dammed from following its usual path along the continental 

 edge. The dynamic calculations in this instance are further sup- 

 ported by the drift of a large iceberg (fig. 38) first sighted by a steamer 



V--W Vt^ 



!■< ; r "■ 



l^./ "^l)---. 





}/ 



/ i 



3 



:^<.-; 



44. 



fS 



'H 



«3 



4^ 



fl 



6'9 5d S2. SI SO ^9 -ffi -*7 ft 



Fig. 38— Set II. The direction and velocity of the currents, April 21-25, 1927. Numbers 66-70 repre- 

 sent a line of oceanographic stations taken by the "Michael Saro," 1910. See p. 80 



on April 14 and then by the patrol on the 16th, and again for the last 

 time on the 17th. Obviously its track agrees closely with the direc- 

 tion of the currents as calculated. It is also interesting that on April 

 16, a calm smooth day, we could plainly see tide rips about 2 miles 

 westward of this berg. This must have been near the boundary of 

 two currents (fig. 38), because later in crossing this zone we experi- 

 enced an abrupt drop in the temperature. 



Figure 39, when compared with Figure 35, shows that the tempera- 

 ture of the water around the Grand Bank grew much warmer during 

 the month of April, except offshore from the southwest slope, where it 

 had cooled somewhat. The distribution of salinity (fig. 40) in general 

 corroborates the temperature chart for the same period. 



