180 



CARNEGIE INSTITUTION OF WASHINGTON. 



differences is being made. The first results are exhibited in the follow- 

 ing table, the divisions between groups being generally at the 5° 

 points. The slight divergence across the zenith precludes any naate- 

 rial error in the apphed correction for North minus South. 



The corrections for the effect South minus North and eye and ear 

 minus chronograph are as follows for the different observers. 



The magnitude corrections are represented by the following quan- 

 tities multiplied by (M — 3.5). 



STAFF. 



The Director has devoted most of his time to the preliminary steps 

 in some statistical studies, to the formation of a system of parallaxes, 

 and to a study of the real space-motion of stars. Dr. Sebastian 

 Albrecht has continued his investigations of standards of wave-length 

 and has studied the problem of personalities as affecting estimations 

 of tenths on a divided circle. Mr. Sherwood B. Grant has devoted 

 his time to reductions of observations. Mr. Heroy Jenkins, in addi- 

 tion to reduction of observations, has been preparing the material 

 for the determination of the systematic errors of recent star catalogues. 

 Mr. Harry Raymond has rendered valuable aid in many departments 

 of the work. Mr. Arthur J. Roy has supervised the reduction of 

 observations and has been discussing the effects of personality on the 

 San Luis observations. Mr. Roscoe F. Sanford was engaged upon 

 several branches of the work. Mr. Carl L. Stearns also performed a 

 variety of computations. Mr. William B. Varnum has brought the 

 computations of some of the instrumental constants nearly up to date. 



The computing division has been composed of Miss Grace I. Buffum,^ 

 Mrs. Livia C. Clark, Miss Mabel I. Doran, Miss Mabel A. Dyer, 

 Miss Alice M. Fuller, Mrs. Mary B. James, Miss Bertha W. Jones, 

 Miss Isabella Lange, Miss Marie Lange, Miss Frances L. MacNeill,. 

 and Miss Helen M. MacNeill. 



The following resignations have taken place during the year: Dr. 

 Roscoe F. Sanford, December 1917; Mr. Carl L. Stearns, May 1918; 

 Miss Mabel A. Dyer, October 1917; Miss Bertha W. Jones, March 1918. 



Miss Helen M. MacNeill joined the staff February 1918, and Miss 

 Mabel I. Doran May 1918. 



