SMITHSONIAN MISCELLANEOUS COLLECTIONS 

 VOLUME 110, NUMBER 11 



lAOcWing Jfunli 



THE SMITHSONIAN STANDARD 

 PYRHELIOMETRY 



P.V 

 C G. A P. HOT 



Research Associate, Smithsonian Institution 



(Publication 3945) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



AUGUST 5, 1948 



