DIRECTION. 



Table 62. 

 Cape Evans Wind. 



109 



It has already been explained that in May, 1911, the position of the wind vane was 

 changed in consequence of which the wind directions recorded were shifted somewhat to the 

 E. To allow for this change and to make the series homogeneous, about 15° needs to be 

 added to the resultant direction for February', March, and April, 1911 ; this has been done 

 and shown by the figures in brackets. Throughout the period February, 1911, to August, 1911, 

 the resultant direction only varied from 8. 61 E. in February, 1911, to N. 89 E. in December^ 

 1911, i.e., a change of only 30° (a little over one compass point). The average ratio of the 

 resultant velocity to the mean velocity was '8 showing the concentration of the wind into 

 a few directions about the resultant direction. 



Taking the twelve months from June, 1911, to May, 1912, the resultant velocity was 13-7 

 miles per hour and the resultant direction S. 77 E. 



