126 



Proceedings of the Royal Irkh Academy. 



Date. 



A5 expressed 



in rev. of the 



screw. 



Ther. 



A5 in 



seconds. 



Weight. 



1871. 













September 23, 



6-95920 



40° 







62" 



603 





J3 



28, 



6-97930 



42 







62 - 



779 





October 



7, 



6-99335 



39 



5 



62 



910 





>> 



20, 



6-99180 



41 







62 



894 





?j 



21, 



7-00335 



44 



5 



62 



990 





?7 



24, 



6-99310 



43 



5 



62 



900 





November 



5, 



6-99390 



37 







62 



921 





j> 



22, 



6-98395 



38 



5 



62 



827 





December 



16, 



6-99230 



■ 37 







62 



907 





!> 



19, 



6-99590 



39 







62 



933 





)) 



20, 



6-97100 



37 







62 



716 





1872. 

















January 



6, 



6-97640 



35 







62 



767 





March 



1, 



7-02915 



42 



5 



63 



227 



6 



n 



8, 



7-01055 



37 







63 



071 





>> 



14, 



7-01730 



39 







63 



126 





) J 



17, 



7-01220 



39 



5 



63 



080 





April 



3, 



7-00625 



35 







63 



034 





)> 



12, 



7-01195 



40 







63 



077 





>> 



13, 



7-00485 



41 







63 



Oil 





May 



31, 



7-00490 



44 







63 



004 





June 



5, 



6-99815 



44 







62 



•943 





it 



7, 



7-00085 



45 



5 



62 



•966 





July 



14, 



6-98540 



56 







62 



•806 





August 



2, 



6-99450 



52 







62 



-896 





J) 



6, 



6-99410 



53 -0 



62 -891 





The observed apparent difPerences of declination must first be cor- 

 rected for refraction and aberration, and reduced to a mean equinox, 

 for which I chose as epoch the beginning of the year 1872. The 

 effect of refraction is in this case veiy small, and nearly constant, as 

 is shown by the following Table, because all the observations were 

 made at considerable altitudes : — 



Hour Angle. 



Corr. for Eefr. 



Hour Angle. 



Corr. for Eefr. 



Oh 

 1 



2 

 3 



+ 0"-019 

 + ^018 

 + -018 

 + -018 



4h 



5 

 6 



7 



+ 0"-018 

 + -018 

 + -021 

 + -026 



