330 



Mr. D. J. Blaikley on the 

 Table V. 



Eadius, in metres 



r 

 •005715 



•009524 -015874 



•026457 



r 4 

 •044095 



Velocity at 0° 0., in 1 

 metres j 



V 



324-383 



326-902 328-784 



V 3 



329723 



330134 







Mean pitch during 1 

 observations J 



n 

 322-96 



260-36 260-18 



172-48 



13115 



J 1 - .</!■*. ... 



•05563 



■06197 -06200 -07615 



•08732 



From these data we may obtain a value for Y = velocity in 

 free air, where r = co , using a modification of ihe formula 



-H 1 "") 



(i) 



The formula v = V (1 ) gives only a fictitious value for v 



when r is very small ; whereas v should =0 when r=0, and 

 should = V when r = oo . 



Put F for the ratio i and / for (1-F) = ~p. Then, 

 aen u = 0, 



F = 0and/=^ =1 ; 



when 



and when v = Y, 

 When F = 0, 



when F=l, 



F = l and/=0. 



log f = 



log-^ = 0. 



Therefore in (1), where 



f.(ij-$)_a-n 



make 



^ = log F = log-=logV- 



or 



^( 1 og-)=^i(log-) (2) 



