SMITHSONIAN' MISCELLANEOUS COLLECTIONS 

 VOLUME 110, NUMBER 5 



i\ocfaliug Jf uub 



SMITHSONIAN PYRHELIOMETRY AND 



THE STANDARD SCALE OF 



SOLAR RADIATION 



BY 

 L. B. ALDRICH 



AND 



C. G. ABBOT 



Smithsonian Institution 



(Publication 3920 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



ATKIL 15, 1948 



