MADE WITH A NEW ANEMOMETER. "311 



It appears in this manner that on the scale of the Society's Anemometer 

 the total wind for these three months was W. 321, S. 558. 



It may be observed that the graphical method offers at once the 

 mean direction of the wind, and the resolution of the winds into their 

 cardinal parts. A straight line drawn from the beginning of the curve 

 to its end is the direction and magnitude of the resulting wind; and if 

 lines E and W and N and S be drawn from its extremities, they 

 will give its component parts. 



If we were to draw the graphical curve of the wind as registered 

 by the Anemometer for a year, and were to do this for several years 

 at the same place, beginning from the same point, we should probably 

 have a set of curves in which a considerable resemblance might be 

 traced ; for there is a kind of annual cycle of the winds at each place. 

 The mean of such curves for a sufficient time would be the mean 

 annual type of the winds for that place. The mean annual type of the 

 winds at different places would vary very much, as is clear from the 

 materials wliicli Kamtz has collected. Thus he finds (Vol. ii. p. 223) 

 that the mean direction at Paris is S 68° W, at Montmorenci N 48° W, 

 at Utrecht N 85° W, and Amsterdam S 61° W. And though, as we 

 have seen, his method of obtaining these results is very insufficient, 

 it still serves to show that they would probably be various by any 

 method. 



If Anemometers of the kind now described were fixed in various 

 parts of the world, and the annual type, and other circumstances of 

 the wind thus obtained, it cannot be doubted but that this portion of 

 meteorology, and probably other portions which are connected with this, 

 would soon make great progress. 



W, W. 



Trinity College, » 



Mat) 1, 1837- 



