SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. ']'] 



Variation 



TEN 



or THt Sun 1918 to 



■DAY MEAN VALUES 



1924 



Fig. 5. — Ten-day mean values of the solar constant of radiation, 1918-1924. 

 The seven upper curves give the march of values on a more extended scale, 

 which is condensed into the single lower line of the diagram. 



