102 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1937 



tution, at Table Mountain, Calif. ; Montezuma, Chile ; and Mount St. 

 Katherine, Egypt. At these three stations the observations to de- 

 termine the solar constant of radiation have been made on all favor- 

 able days. The average number of days per year suitable for these 

 exacting observations is about the same at these three elevated cloud- 

 less desert stations and approaches 80 percent of all days. 



PERSONNEL 



Frederick E. Fowle, research assistant, who joined the staff of the 

 Astrophysical Observatory in the year 1894, was retired for dis- 

 ability at the end of the fiscal year. Mr. Fowle has been associated 

 with practically the entire history of the Observatory, and has taken 

 a large part in its observing, computing, theoretical studies, and 

 plans for its work. He will be especially remembered for his re- 

 searches on water vapor and ozone in the atmosphere, for his long 

 investigation of the extreme infrared spectrum of water vapor, and 

 for his authoi-ship of numerous editions of "Smithsonian Physical 

 Tables", which enjoy an enviable reputation. 



Kespectfully submitted. 



C. G. Abbot, Director. 



The Secretary, 



Smithsonian Institution. 



