SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 60, NUMBER is 



SMITHSONIAN PYRHELIOMETRY 

 REVISED 



BY 



C. G. ABBOT, Director, and L. B. ALDRICH, Bolometric Assistant, 

 Astrophysical Observatory of the Smithsonian Institution 





w TV W 



(Publication 2164) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



FEBRUARY 1, 1913 



