8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. JJ 



Increase of SOLAB RAD. from below 1.931 to above 1.960 



Pressure same day Winter half year 



Pressure 1 day later Winter half year 



lis no 



Pressure 2 days later ff inter half year 



Fig. 5.— Mean pressure differences resulting from an increase of 

 solar radiation from below 1.931 to above 1.960, o to 2 days later, 

 winter half-year. Units in hundredths of an inch. 



