620 



Sir Napier Shaw 



[March 10, 



■will be given by the roots of a quadratic equation, which will be 

 impossible if v is greater than — — This for a circle of 70 



miles diameter only allows a velocity of about 4 metres per second. 



This is confirmed in practice, and furnishes a crucial test of the 

 two theories. If an anticyclone is a place where air descends and 

 flows outward, its velocity should diminish as the air spreads outwards, 

 but the reverse, is the case with an anticyclone. 



RELATION OF WIND ELEMENTS TO HEIGHT. 



VELOCITY 

 10 20 



30 N 



DIRECTION 

 E 3 W N 



Figs. 5 and 6. — Diagrams representing the velocity and direction 

 of the wind from 8 kilometres upwards on six occasions in 1908. The 

 scale on the lefthaud side gives the height in kilometres, that at 

 top and bottom of the velocity-diagram the velocity in metres per 

 second. Directions are indicated by the points of the compass at the 

 top, and the orientation in degrees from North, at the bottom. 



2. The small mflnence of the troposphere and therefore the dominance 

 of the stratosphere in the distribution of surface pressure. 



This follows directly when numerical values are inserted in 

 equation A. The right hand side of the equation consists of two 

 terms which are of opposite sign, and numerically approximately 

 equal in the middle regions of the troposphere. Their combined 

 effect for the whole range is therefore relatively small, and the change 



