230 CARNEGIE INSTITUTION OF WASHINGTON. 



of measurement are obvious, for it affords a means of overcoming the 

 most serious difficulty arising from bad seeing and, probably to some 

 extent, that caused by any abnormality of the images, whether it be 

 the result of imperfect guiding, or of aberrations or temperature 

 deformations of the optical system. 



Investigation of the Photographic Process. 



Mr. Scares has presented a very complete report on his study of 

 the photographic process, which embodies the views of many photo- 

 graphic chemists in this country and Europe on the possibility of 

 improving the quality of sensitive plates employed in astronomical 

 and r hysical observations. The opportune establishment in Roches- 

 ter by the Eastman Company of a large and admirably equipped lab- 

 oratory for photographic research, under the direction of Dr. C. E. 

 Kenneth Mees, will probably render unnecessary any independent 

 action on our part, since it is expected that just such problems as we 

 have had in mind will be thoroughly worked out. 



COMPUTING DIVISION. 



The Computing Division has remained throughout the year under 

 the direction of Mr. Scares. 



Miss Burwell has devoted her time to miscellaneous investigations 

 relating mainly to solar and stellar spectroscopy. She has measured 

 and reduced 12 chromosphere spectrograms, 2 spectrograms of Nova 

 Geminorum No. 2, and 242 stellar spectrograms for the determina- 

 tion of radial velocities. She has also measured a number of photo- 

 graphs made by the Hartmann method for testing the figure of the 

 100-inch mirror, and has done miscellaneous computing connected 

 with the investigation of the sun's general magnetic field. Miss 

 Burwell served as librarian from January 20 to May 1, 1913. 



Miss Ensign has continued her work in connection with stellar 

 spectroscopy. She has measured and reduced 1,050 spectrograms for 

 radial velocities and has calculated and checked the reductions to the 

 sun for a large number of plates. In addition she has measured 

 several pairs of Hartmann test plates for the 100-inch mirror and has 

 done miscellaneous computing and checking of calculations. 



With the exception of a considerable amount of computing relating 

 to the sun's general magnetic field. Miss High has devoted her time 

 exclusively to the work in stellar photometry. She has measured 

 and reduced 175 Polar Sequence plates, 28 plates of RR Draconis, and 

 105 plates of the Selected Areas. Miss High has also prepared iden- 

 tification charts for the 115 Selected Areas included in the program 

 for the determination of photographic magnitudes, and has done 

 miscellaneous work connected with the same investigation. 



Miss Lasby has divided her time between stellar spectroscopic 

 and laboratory investigations. Over 1,000 spectrograms have been 



