SMITHSONIAN MISCELLANEOUS COLLECTIONS 

 VOLUME 123, NUMBER 5 



l^oebling :f unb 



CONCERNING SMITHSONIAN 

 PYRHELIOMETRY 



By 

 C. G. ABBOT, L. B. ALDRICH, and A. G. FROILAND 



Astrophysical Observatory, Smithsonian Institution 



(Publication 4179) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



NOVEMBER 2, 1954 



