226 CARNEGIE INSTITUTION OF WASHINGTON. 



STAFF. 



The Director, after attending international scientific conferences 

 at the Royal Society in October and the Paris Academy of Sciences in 

 November, returned to the United States in December, and continued 

 his work as Chairman of the National Research Council. On April 

 30, 1919, he resigned the chairmanship of the Council and returned to 

 Pasadena, where he has since devoted all of his time to the work of the 

 Observatory. Dr. Walter S. Adams, Assistant Director, who con- 

 tinued in general charge of the Observatory during the Director's 

 absence, carried forward his investigations in stellar spectroscopy until 

 June 1919, when he went to Europe as a member of the American 

 delegation to the Brussels meeting of the International Research 

 Council. Professor F. H. Scares, superintendent of the Computing 

 Division and editor of the Observatory publications, continued his 

 researches in stellar photometry and his investigations of the general 

 magnetic field of the sun until June 1919, when he went abroad with 

 the Assistant Director as a member of the American delegation to 

 Brussels. Dr. Arthur S. King, superintendent of the Physical Labora- 

 tory, devoted about half his time prior to the armistice to experiments 

 on projectiles and tests of optical glass. He has since continued his 

 spectroscopic investigations with the electric furnace, including studies 

 of the Zeeman effect in a small furnace placed between the poles of a 

 magnet. Dr. C. E. St. John continued his spectrographic investiga- 

 tions on the solar rotation, the determination of solar wave-lengths, and 

 the displacements of the lines in the spectrum of Venus until June, 

 when he went with Dr. Adams and Professor Scares to the Brussels 

 meeting of the International Research Council. Dr. J. A. Anderson 

 devoted all of his time to experimental researches for the Navy up to 

 the time of the armistice; since then he has resumed his investigations 

 on the effect of an electric field on radiation, designed a powerful 

 electro-magnet for the laboratory, and continued his tests of the ruling- 

 machine with Mr. Jacomini. Professor Ritchey has given most of 

 his time to optical work for the Ordnance Department of the Army. 

 Mr. Harold D. Babcock, after the conclusion of his experimental work 

 for the Navy with Dr. Anderson and Professor Ryan, has continued 

 his investigations on standard wave-lengths and undertaken a study of 

 the polarization of the night sky at the request of Lord Rayleigh. Mr. 

 Ferdinand Ellerman has continued his solar observations and his work 

 as Observatory photographer. Mr. Francis G. Pease, after returning 

 from his duties in Washington with the National Research Council, has 

 continued his work of instrument design and his photographic observa- 

 tions of nebulae and star-clusters. He has also given much time to the 

 adjustment and tests of the 100-inch Hooker telescope. Dr. Harlow 

 Shapley has continued his investigations of star-clusters and variable 

 stars and his researches on various sidereal problems. Dr. Adriaan 



