OF THE DIRECTION AND FORCE OF TUE WIND. 



71 



with the above, the result at Van R. having 

 observations a day. 



True direction. Baffin Bay. 



S 3233 



S.W 3807 



W 6007 



N. W 2223G 



N 10256 



N. E 5188 



E 4105 



S. E. . . . . . 8161 



first been halfed to refer to twelve 



Sum . . 62993 12759 68103 



These results of the relative quantity of air moved over each place are also 



shown in the annexed diagram. 



Owing to the small differences in 



the velocity of the several winds, the 



above diagram of the quantity of wind 



resembles that of the frequency of the 



winds, at least, in all its characteristics. 

 It cannot be expected that the rela- 

 tions of the wind within the Arctic 



Circle should come out with any de- 

 gree of certainty from but a single year 



of observation, or even from several 



years ; and before we can arrive at 



their true characteristics, we must 



combine results at different stations as 



well as in different years. 



Rotation of the Wind. — For the pur- ,<,,<■ . . , > 



" ■*■ (D 10 GO BU 411000 



pose of ascertaining the law of the 

 rotation of the wind, the observations 



were examined in reference to the number of times the wind arrived at each of 

 the eight principal directions, the motion each time not being less than 45° ; and 

 also in reference to the sum total of angular motion, in a direct and retrograde 

 sense. The direction in which the hands of a watch (face up) turn, and which 

 corresponds to the direction of the rotation of the wind, according to Dove, has 

 been assumed as direct, and is indicated by a + sign ; the opposite direction is 

 indicated by a — sign. 



The following table exhibits the number of changes of the wind, or the number 

 of times it arrived at any one of the principal directions during a given period, and 

 also the amount it shifted, or its angular motion expressed in units of 45°. In 

 making out these numbers for each wind, not only the four-hourly series of obser- 

 vations, but also the intermediate observations in certain months were used. After 

 each calm the counting was commenced anew, and also in cases where the wind 

 shifted suddenly 180°. 



