SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 87, NUMBER IS 



,i 



rif^'''" 



S^i.Af* j.VJ," 



IRoeblino jfunb novh 1932 



AN IMPROVED 



WATER-FLOW PYRHELIOMETER AND THE 



STANDARD SCALE OF SOLAR 



RADIATION 



(With One Plate) 



BY 



C. G. ABBOT and L. B. ALDRICH 



Smithsonian Institution 



(Publication 3182) 



CITY OF WASHINGTON 

 PUBLISHED BY THE SMITHSONIAN INSTITUTION 



NOVEMBER 11, 1932 



