METEOROLOGICAL OBSERVATIONS At PLYMOUTH. 3/ 



The following calculations with the accompanying Plates re- 

 present the result of observations made at Plymouth, with an 

 Anemometer of Mr. Whewell's construction. This instrument 

 gives what Mr. Whewell calls the integral effect of the wind, 

 namely, a space proportional to that which a particle of air would 

 pass over in each day in consequence of the wind, taking into 

 account both the strength of the wind and the time during which 

 it blows. These integral effects being put together according to 

 their directions, each day beginning at the end of the preceding so 

 as to form a continuous line, as is done in the Plates, we obtain 

 the path of the wind for each month, or for a longer time. The 

 annual path of the wind at each place will have, it may be ex- 

 pected, a general similarity in different years ; and the mean 

 form to which the annual path thus approximates is called the 

 ti/pe of the wind for each place. 



A description of the Anemometer, of the mode of using it, 

 and of the process of i-educing the observations is given in the 

 Transactions of the Cambridge Philosophical Society for 1837 j 

 vol. vi. Part II. 



