160 MARION EXPEDITION TO DAVIS STEAIT AND BAFFIN BAY 



path southeast of the Grand Bank. A map. such as Figure 102, show- 

 ing the compiled drifts of the foregoing bergs, and many more be- 

 sides furnishes the best information available as to their general 

 paths in the currents. Its most instructive feature is its demonstra- 

 tion that the heaviest ice stream is past the Tail of the Grand Bank 

 to the vicinity of latitude 42^ 30'. longitude 51° 30'. where the bergs 



The Drift Tracks of icebergs. 1900-1930 



Figure 102. — The courses that icebergs have foUowed south of Newfoundland is a 

 record compiled by the international ice patrol, as it has tracked bergs for distances 

 of 400 miles and more in the ocean currents. 



tend to turn abruptly to the left, and thereafter follow an easterly 

 course until they perish. 



We have on the ice patrol al'so collected over a period of several 

 years the physical data needed for the dynamic computation of the 

 oceanic circulation in the region of the Grand Bank in accordance 

 with Bjerknes's theory of free motion. (See Smith (1926).) Dur- 



