MOUNT WILSON SOLAR OBSERVATORY. 279 



lax have also been computed. In addition, the measurement of the 

 laboratory plates of the iron spectrum undertaken for Mr. Gale for the 

 determination of the shift at low pressure has been completed. A few 

 photographs of iron spectra for Zeeman effect and several solar rotation 

 plates of the new series were also measured. 



Miss McClees joined the division May 15, and at present is occupied 

 with measures and reductions of spot spectra and miscellaneous com- 

 putations. 



Up to the date of her resignation in January, Mrs. Nichols continued 

 her work with the laboratory plates, about 100 being measured and 

 reduced. Much time was also given to the classification and collection 

 for publication of the results on vanadium and chromium, and to the 

 reductions for the determination of the constant elm. 



Miss Shumway has continued to serve as recorder and computer in 

 connection with the stellar spectroscopic work. Besides reducing sev- 

 eral hundred spectrograms for radial velocity, she has done the comput- 

 ing necessary for the extension of the reduction tables used in this work. 



Miss Richmond has measured and reduced 156 stellar photometric 

 plates and 24 solar photographs relating to spot spectra and the sun's 

 general magnetic field. A month was occupied with computations on 

 the general magnetic field, and much time has been given to miscel- 

 laneous computations, proof-reading, etc. 



Miss Smith has continued with the routine reductions relating to 

 the spectroheliograph plates. The areas of the calcium flocculi have 

 been determined on 201 spectroheliograms, and 237 prominence plates 

 have been measured. All reductions, including the fluctuation curves 

 of the calcium flocculi and prominences, are completed to May 8, 1914. 

 Three hundred prints of spectroheliograms have been made, and the 

 data for a statistical investigation of sun-spot grouping are being 

 collected and classified. Miss Smith also superintended the transfer 

 of the 12,000 solar photographs from the old vault to that of the new 

 office building, and has checked their present arrangement by the 

 serial numbers. 



Miss van Deusen was engaged until January with star counts upon 

 35 of the photographs of globular clusters made by Mr. Pease. Since 

 then she has measured and reduced about 20 plates taken for the 

 determination of the pole and center shifts of the iron arc and for the 

 comparison of the shifts in the solar and iron-arc spectra. She has 

 also made the screw tests for two new comparators. 



Miss Ware has continued with the work connected with the solar 

 investigations of Mr. St. John. An extended series of measures has 

 been made upon laboratory plates for the determination of the charac- 

 teristics of the spectrum of different parts of the arc and for the compari- 

 son of arc and solar spectra. For the latter purpose a number of solar 

 plates have also been measured. In addition, there has been much 

 computation and compilation, all relating to the solar investigations. 



