278 CARNEGIE INSTITUTION OF WASHINGTON. 



Three series of measures have been made, giving vakies of e/w, as 

 follows: 1.754, weight 1; 1.762, weight 14; 1.761, weight 3. The 

 weighted mean is 1.761, with an uncertainty of not more than 2 units of 

 the last place. 



These values are based upon 65 lines measured on 46 plates. Nine 

 different field-strengths were used and 16 independent measures of H 

 ■were made. The lowest field was 26,560 and the highest 31,880 gausses. 

 The results were obtained by means of plane-grating spectrographs, the 

 current measurements being in terms of resistance and the e. m. f. of a 

 standard cell. A fourth series, using an interferometer for the spec- 

 trum measures and a control of the current strength by deposition of 

 silver, is being undertaken. 



COMPUTING DIVISION. 



The Computing Division has remained throughout the year under 

 the direction of Mr. Scares. 



Miss Bach was appointed to the division on January 1, and has been 

 engaged in the measurement of laboratory plates. Seventeen plates 

 for the Zeeman effect and 22 for the evaluation of e/m have been 

 measured and reduced. She has also done some w^ork upon spectrum 

 lines w^ith the micro-photometer. 



Miss Burw^ell has given her attention to the investigations in stellar 

 spectroscopy. She has measured and reduced 600 stellar spectro- 

 grams and has computed a large number of star constants and reduc- 

 tions to the sun. In addition to the stellar w^ork, she has collected and 

 reduced the measures of the flash spectrum wdthout an eclipse, and has 

 measured several test-plates for the 100-inch mirror. 



Miss Ensign has also been engaged with the stellar spectroscopic 

 work. She has measured and reduced 600 spectrograms, has calculated 

 and checked star constants and reductions to the sun, and has measured 

 several pairs of test-plates for a 30-inch and for the 100-inch mirror. 



Miss Felker was appointed to the division October 14, 1913, but 

 was obliged to resign in April on account of ill health. Her time was 

 divided betw^een the measurement and reduction of spot spectra and 

 general magnetic field plates, and computations relating to the photo- 

 metric w^ork upon polar stars and Selected Areas. 



Miss High has been occupied mainly with the work in stellar pho- 

 tometry. She has measured and reduced 140 photometric plates. In 

 addition, she has measured several spot spectra and has given a large 

 amount of time to the reduction of these and similar plates and to 

 computations relating to the sun's general magnetic field. 



As in the past, Miss Lasby has been engaged mostly with the inves- 

 tigations in stellar spectroscopy. She has measured about 700 spec- 

 trograms for radial velocity and has computed the reduction constants 

 of over 200 stars. The absolute velocities for 40 stars of know^n paral- 



