64 



H. JACOBY 



Values of a' . . 



Values of iz 



n 5 s 



Star. 



Image 1. 



Image 6. 



Image It. 



Image 17. 



Image 22. 



Image 



1 



410?82 



387?60 



869?92 



364*89 



376?36 



396'' 



2 



593.33 



606 . 41 



606 . 52 



593.16 



571.50 



550. 



3 



813.75 



790.16 



771.50 



765.57 



774.47 



794. 



4 



1156.71 



1178.81 



1193.12 



1194.14 



1181.31 



1160. 



5 



1487.09 



1508 . 80 



1521.75 



1521.23 



1506.93 



1485. 



6 



1786.09 



1777.30 



1783.19 



1801.52 



1824.21 



1841. 



7 



2460.14 



2465 . 56 



2465 . 28 



2484 . 69 



2507 . 43 



2522. 



8 



2738.52 



2746 . 63 



2736.61 



2718.10 



2696.51 



2678. 



9 



2720.93 



2705 . 88 



2705.31 



2718.01 



2740.41 



2760 . 



10 



3687.28 



3672.41 



3650.67 



* 



3629.72 



3618.23 



3622 . 



For the computation of the refractions the following approximate va- 

 lues of the apparent right ascensions of the stars were used. The numbers 

 are of course different for the successive images of each star, and they were 

 obtained by a preliminary discussion of the plate itself. 



♦D3.-MaT. CTJ>. 64. 



24 



