ON THE ANEMOMETERS OF PLYMOUTH. 



247 



The relative directions and magnitudes of these resultants for each month 



are shown in the an- 

 nexed cut, the months 



being numbered 1, 2, 



3, 4, &c. 



The greatest mean 



monthly velocity in the 



resulting directions is 



by these results in 



March and November ; 



and the least in January 



and October; the mean 



direction of the current 



in March and Novem- 

 ber being nearly the 



same. Southerly winds 



prevail in March, and 



northerly in October, 



and easterly winds in 



April, that is, upon the 



mean of these three 



years: for the remaining 



months the wind gene- 

 rally blows upon the 

 land from some point 

 between W.S.M^. and 

 E.S.E. 



The effective winds 

 in the order of follow- 

 ing points for each of 

 the seasons of spring, 

 summer, autumn, and 

 winter, are given in Ta- 

 ble XIII., as deduced 

 from the mean results 

 in Tables VII. and VIII. 

 These are laid off in figs. 

 10, 11, 12, 13, Plate 

 XXXVI., and give the 

 following results : — 



