310 



THE SAYRTC OBSERVATORY. 



this group. The differences between the individual values and the mean of all will 

 furnish the corrections required to reduce the individual latitudes to the mean system. 

 Obviously these corrections are not required when all of the pairs have been observed. 



In the present case, as the observations were not arranged with reference to the 

 groups, the number of evenings when all pairs were obtained was usually too small to 

 furnish reliable values for these corrections. It is therefore necessary to combine for Ibis 

 purpose observations made on different evenings. This procedure is open to objection, 

 but in this case no other seems available. The values of these corrections follow. They 

 are given in units of the second decimal place. 





Pairs 



Group 





























1 



■ J 



S 



/,. 



s 



6 



7 



8 



9 



10 



ii 



12 



i 



+ 18 



+ 8 



+ 12 



— 19 



— 7 



— 11 



— 20 



+ 17 



-1- 17 



+ 14 



— 29 





ii 



— 32 



— 5 



f 82 



— 23 



— 6 



— 1G 



— 5 



9 



— 6 



+ 2 







in 



!- 



+ 32 



— 55 



— 26 



+ 12 



+ 4 



-1- 8 



— 25 



+ 43 



— 13 



+ 13 





IV 



+ 7 



+ 21 



— 8 



— 17 



— 4 



— 



— 23 



— 7 



i o 



+ 25 







V 



— 8 



— 29 



+ 10 



+ 12 



— 14 



— 8 



+ 8 



— 5 



| 28 



— 7 



I- 1" 



+ 8 



VI 



— 17 



— 10 



•1- 37 



— 45 



— 22 



— 3 



— 9 



+ '72 



— 2 



1 1" 



— 17 





VII 



2 



— 8 



-|- 47 



+ 17 



— 12 



— 14 



— 5 



— 3 



+ 23 



1 8 



— 3 





VIII . 



+ 18 



— 28 



+ 2 



+ 11 



-]- 90 



— 16 



+ 20 



— 37 



! 8 



+ 20 



+ 12 



— 7 



IX 



— 13 



+ 21 



2 



+ 29 



— 35 



— 24 



-1- 1 



+ 13 



+ 34 



+ 18 



— 46 





X 



— 29 



— 29 



— 21 



+ 37 



— 20 



— 9 



-1- 10 



+ 8 



— 4 



+ 8 



-| 24 



-1- 33 



The algebraic sum of the corrections for each group should be zero, except that 

 pairs 1 and 3 of Group VII and 5 of Group VIII wen; observed only at (he evening 

 culmination. For these groups therefore the reduction is to the mean of the remaining 



pairs. 



Final Adjustment. 



After application, when necessary, of the above corrections, the means in case of 

 each group are formed for convenient intervals, which in the present cast; average about 

 26 days. The resulting values follow : 





7 



ir 



in 



IV 



r 



VI 



VII 



VIII 



IX 



\ 







'/> 



No. 



</> 



No. 



* 



No. 



</■ 



No. 



•!■ 



No. 



</■ 



No. 



</> 



No. 



</• 



No. 



</> 



No. 



* 



No. 





II 





a 





ji 





ii 





is 





ii 





a 





a 





// 





a 





1839 Dec. 1-Doc. 28 



3.036 



65 



3.062 



87 















3.053 



47 



















1890. hm. 14-Feb. 20 







3.392 



17 



8.205 



48 



3.259 



8 







3.150 



6 



3.329 



48 



3.401 



29 











Feb. 22-Miir. 29 











3.257 



15 



8.420 



42 



3.177 



10 











8.548 



12 











Apr. 1-Apr. 12 















3.373 



3 



3.576 



47 



3.280 



1 







3.850 



17 



3.605 



29 







Apr. 16-May 11 



















3.803 



19 



3.467 



84 











3.603 



15 







May 12-June 8 























3.436 



29 



3.550 



21 







3.511 



21 



3.403 



17 



Junel4-July 22 



3.449 



56 



8.847 



6 



















3.41.5 



44 



3.632 



62 







3.489 



47 



July 80-Aug.28 



2.982 



8 



3.324 



30 























3.442 



35 



8.191 



19 







A.ug.24-Sept. 2 







8.308 



26 



3.071 



24 



















3.300 



3 



3.420 



22 







Sept. 7-Oct. 14 







3.890 



2 



2.970 



45 



8.089 



32 



















8.279 



58 



3.078 



23 



Oct. 15-Nov. 5 















3.118 



28 



3.173 



45 















3.101 



II 



3.039 



88 



Nov.l3-I)ec. 13 



3.001 



82 















3.067 



36 



3.065 



11 















2.958 



55 



