282 CARNEGIE INSTITUTION OF WASHINGTON. 



exposure North Polar plates, and 228 plates used for the determination 

 of the magnitude scales for the bright polar stars were measured and 

 reduced. 



Miss Joyner was appointed to the division on March 1, and since 

 that date has measured and reduced 30 photometric plates of Selected 

 Areas. 



Miss McClees has measured and reduced 26 plates of sun-spot 

 spectra and has done a large amount of checking and miscellaneous 

 computing relating to work in photometry and stellar spectroscopy. 



Miss Miller, who was appointed on September 14, has assisted in the 

 solar and laboratory investigations of Mr. St. John. Twenty spectrum 

 plates have been measured, and much miscellaneous computing has 

 been done. 



Mrs. Monk, who joined the division on October 1, has given her 

 entire time to the work in stellar spectroscopy. Over 250 spectrograms 

 have been measured and reduced. Compilations of star constants and 

 reductions to the sun have also been made by Mrs. Monk. 



The time of Miss Richmond has been divided between the work 

 relating to stellar photometry and the measurement of sun-spot spectra. 

 43 Selected Area plates and 208 photographs for the magnitude scales 

 of bright polar stars were measured and reduced. 17 plates of spot 

 spectra were completely measured, and on several others individual 

 lines were measured for a study of the magnetic field in the vicinity of 

 sun-spot groups. Four test plates for the 100-inch mirror were also 

 measured. 



Miss Shumway has continued to serve as recorder and computer in 

 connection with the stellar spectroscopic work. Aside from the regu- 

 lar reductions she has calculated a special table for the transformation 

 of Hne displacements into radial velocities. 



Miss Smith, who resigned on June 1, has continued the routine reduc- 

 tions relating to the spectroheliograph plates. The measurement of the 

 calcium flocculi has been discontinued, but the prominence plates are 

 reduced as formerly. 210 of these were measured, which completes the 

 series to March 21. Prints of 766 spectroheliograms and photoheUo- 

 grams were made and added to the permanent collection. Miss Smith 

 has also given time to the work in stellar photometry, 41 Selected Area 

 plates having been measured by her. Partial reductions of several of 

 these plates were also made. 



Miss Ware has continued her work in connection with the solar 

 and laboratory investigations of Mr. St. John. The laboratory plates 

 include those taken for the investigation of the pole and center effect 

 in the arc and also a certain number of photographs made partly with 

 the vacuum arc and partly under pressure. A number of iron-arc 

 and solar comparison plates have also been measured. The solar 

 plates measured are those made for the determination of the sun's 



