APPENDIX 7 

 REPORT ON THE ASTROPHYSICAL OBSERVATORY 



Sir: I have the honor to submit the following report on the activi- 

 ties of the Astrophysical Observatory for the fiscal year ending 

 June 30, 1934: 



Tliis observatory comprises: (a) The central station at Washing- 

 ton where apparatus is made and standardized; where reports are 

 computed, written, and published; where preparations for expedi- 

 tions are made; and where a general oversight is maintained of the 

 field stations, (b) A station on Mount Wilson near Pasadena, Calif., 

 where brief expeditions for special researches go from time to time. 

 (c) A station on Table Mountain near Swartout, Calif., where daily 

 observations of the solar constant of radiation are carried on. (d) A 

 similar solar-constant station on Mount Montezuma, near Calama, 

 Cliile. (e) A similar station on Mount St. Katherine near Mount 

 Sinai, Egypt. These stations are supported principally by annual 

 Government appropriations, but in a considerable part by private 

 funds. 



WORK AT WASHINGTON 



Messrs. Aldrich and Fowle and Mrs. Bond completed the statis- 

 tical analysis of the observations made at !Mount Montezuma since 

 1932. Thereby an improved method of reduction was worked up, 

 which is now in regular use at Montezuma. Increased accuracy 

 over the former method has resulted. 



Mr. Fowle 's revision of the Smithsonian Physical Tables has been 

 published as the Eighth Revised Edition, greatly enlarged. Much 

 favorable conmient has come regarding it. 



Director Abbot, with the assistance of Mrs. Bond, has continued 

 the study of solar variation with reference to weather changes. 

 Several papers thereon have been published. 



With the assistance of A. Kramer, mechanician, and Messrs. 

 Clark and McAlister of the Division of Radiation and Organisms, 

 Messrs. Abbot and Aldrich prepared an expedition to Mount Wilson 

 for the summer of 1934. The accomplishments of this successful 

 expedition will be reported in 1935. 



WORK IN THE FIELD 



The station at Table Mountain reported daily by telegraph the 

 solar-constant values obtained. These were communicated to 

 Science Service for daily international broadcasting. 



11166G— 35 5 51 



