SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. JJ 



1.950 



30.10 

 30.05 

 30.00 



SOLAR RADIATION 





''it 



Winnipeg 

 B 



Chlceigo 



Fig. 2. — Comparison of solar radiation and atmospheric pressure in 

 latitudes 40°-50° N., winter half-year, 1918-1922. 



