1916] on Illusions of the Upper Air C19 



Winds of equatorial regions, cyclostrophic winds 



s = p ^cot r . . . . (2) 



The measurement of pressure 



i^r--^" .... (3) 



The gaseous laws (assumed for dry air) 



p = \ip0: . . . . (4) 



From these, by simple manipulation, I have deduced the 

 following : — 



For change of pressure-gradient with height 



f:=^Ki-p • • • • (A) 



For change of wind velocity with height, geostrophic winds 



ii! = ^'x^ + ^- I . . (B) 



dh e dh 2 iomik ^ ^ 



Cyclostrophic winds 



dh dh coir'e ' ' ' ^ ^ 



Deductions from the Theory of Equivalence of 

 Pressure and Wind. 



These equations serve to explain the following facts established 

 by observation* : — 



1. Light winds in the central region of an anticyclone. 



It follows from the fundamental equation F, when the negative 

 sign is taken, as it must be for an anticyclone, that the values of v 



* The following references may be given for the statements enumerated here : 



1. Barometric Gradient and Wind Force. Report by Ernest Gold, 



M.O. publication, No. 190. 



2. Shaw, Journal of the Scottish Met. Soc, vol. xvi. p. 167, 1913. 



3. Shaw, Q. J. Roy. Met. Soc, vol. xl. p. Ill, 1914. 



4. The Free Atmosphere of the British Isles. Report by W. H. Dines, 



F.R.S., M.O. publication. No. 202. C. J. P. Cave, The Structure 

 of the Atmosphere in Clear Weather, Cambridge Univ. Press. 

 E. Gold, The International Kite and Balloon Ascents, Geophysical 

 Memoirs, M.O. publication, No. 210e. 



5. Shaw, Principia Atmospherica, Proc. R.S.E., vol. xxxiv. p. 77, 1914. 

 The computations of equations B and C are not yet published. 



