Of course, a comparison of the observed wind and drift paths gives the wind factor and the 

 drift angle created by the joint action of the wind and the steady current. Also it is clear that if we 

 know the elements of the steady current, it will not be difficult to obtain the corresponding for the 

 pure wind drift. 



Table 102 gives the average monthly drift angles and the wind factors for drift of the Sedou . 



TABLE 102, MEAN MONTHLY DRIFT ANGLES AND WIND FACTORS 

 DURING THE DRIFT OF THE SEDOV 



Month 



Number 

 of Cases 



Wind Factor 



Observed 



True 



Drift Angle 



Observed 



True 



1938 



September 



October 



November 



December 



1939 



January 



February 



March 



April 



May 



June 



July 



August 



September 



October 



November 



December 



Average for drift 



9 

 14 

 32 

 30 



38 

 25 

 31 

 28 

 23 

 20 

 19 

 18 

 14 

 24 

 125 

 28 



378 



0.016 

 0.017 

 0.017 

 0.020 



0.016 

 0.015 

 0.018 

 0.015 

 0.015 

 0.026 

 0.014 

 0.019 

 0.020 

 0.016 

 0.023 

 0.022 



0.018 



0.015 

 0.014 

 0.013 

 0.017 



0.016 

 0.014 

 0.014 

 0.013 

 0.015 

 0.018 

 0.014 

 0.016 

 0.018 

 0.013 

 0.017 

 0.018 



0.015 



32° 

 49 

 16 

 39 



25 

 -3 

 29 

 26 

 34 

 39 

 15 

 -6 

 18 

 15 

 29 

 46 



25 



36° 

 45 

 24 

 37 



31 

 8 

 25 

 29 

 26 

 19 

 42 

 31 

 14 

 35 

 27 

 34 



29 



Figures 130 and 131 show the frequency of repetition of purely wind (steady current excluded) 

 drift angles and wind factors, expressed in per cents. The results obtained indicate that random 

 causes are excluded sufficiently well by a large number of observations. 



Figure 130 shows that In 88 per cent of all cases the drift angle was positive (to the right of 

 the wind direction) and that in 80 per cent of all cases it was between 0° and 70°. As an average of 

 all 378 cases we found that the true drift angle was 29° to the right of the wind direction. Let us 

 recall that Nansen obtained a true drift angle of 28° for 76 cases. This agreement undoubtedly per- 

 mits us to regard the results obtained as sufficiently reliable. 



Figure 131 shows that the true wind factor varies from 0. 005 to 0. 025. Only about 5 per cent 

 of the cases lay outside these limits. The average of 378 cases was 0. 015. According to Nansen, 

 this factor was 0.018 for 76 cases. 



363 



