MADE AT BRUNSWICK, MAINE. 



41 



the N. E. wind to three times its amount from summer to winter ; the increase of 

 the N. W. wmd in winter is of less amount. 



The following Table XI contains the resulting direction of the wind for each 

 month, season, and during the year from over 60 years of observations 



Table XI. — Resulting Dieection op the Wind. 





4- 



s 





■^ 



s 



January 



February .... 



March. 



April 



May 



June ..... 



S. 141°W. 

 131 

 116 

 101 



62 

 66 



0.406 

 0.403 

 0.344 

 0.263 

 0.222 

 0.346 



July 



August ..... 

 September .... 



October 



November .... 

 December .... 



S. 66° W. 



68 



84 



101 



131 



140 



0.462 

 0.426 

 0.381 

 0.349 

 0.404 

 0.421 



Spring 



Summer .... 



S. 97° W. 

 67 



0.257 

 0.411 



Autumn ..... 

 Winter 



S. 106° W. 

 136 



0.356 

 0.413 



Year 



S. 102° W. 



0.320 



The average annual direction of the wind is 12° north of west, or W. by N. very 

 nearly. The change from month to month appears quite regular; the extreme 

 variation between the direction in January and July is 75° ; in January the average 

 direction is 51° N. of W. and in July 24° S. of W. The transition from 101° to 

 62° in April and May is rather sudden. 



The numbers in the last column show the average length of the resultant ; they 

 indicate that in spring the neutralizing effect of opposing winds is at a maximum, 

 and in winter at a minimum ; in other words, the winds are more steady in winter 

 than in spring. 



If we bring out the resultant of the directions of the wind observed during each 

 year we shall obtain the following Table XII. It contains the number of times 

 each wind blew during the year, and in a few cases where the record was wanting 

 during a month, an interpolated value is given, which is found by taking the mean 

 of the number of winds in the same month in the years preceding and following. 

 The tenth column exhibits the annual mean direction ^p. 



April, 1867. 



