GOULD REDUCTION OF D AOELET S OBSERVATIONS. 



Corrections for adjustment of Quadrant and Clock — Continued. 



23 



$ 9. INSTRUMENTAL ERRORS AFFECTING THE DECLINATIONS. 

 The character of the deviations of the quadrant-limb from a plane naturally gave rise to the 

 suspicion that so serious a distortion might also have affected the indications of zenith-distance; 

 and a careful examination showed that this suspicion was not unfounded. By a process analo- 

 gous to that employed for determining the deviations n and the correction q, a series of solu- 

 tions by least squares yielded values for the equatorial point on each day, and for a correction 

 q\ constant for each star, but varying with the declination. The results of this investigation 

 are given in the accompanying tables. The first, " Corrections to equatorial 'point" contains the 

 combined effect of the corrections for zenith-point and for error of latitude; and the second, 



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