112 



Reduction of Stellar Photographs. 



Right Ascension. 



Xsec '5 



-{-.000137 Xsec' 

 -l-.ooooii Y 

 Constant 

 X sec <^ 



± (Tab. II a)-^- 

 \ / 1000 



+ (Tab. II C)'^-^^' 

 ' \ / 100 



=F (Tab. II D) 



Aa 



a (Centre) ] 



a> (Star) c 



4 

 59 



—267.483 



— .037 



+ .017 



— -193 



— 267.696 



— .886 



— .003 



+ -034 



—268.551 



28.551 



0.000 



31-449 



Declination. 



— .00209 Xsecrf 

 -|-. 000256 Y 

 Constant 



y 



—(Tab. Ill A) 



— (Tab. Ill C)-^- 



\ / 1000 



=+: (Tab. Ill D) 



Ad 



AJ 



rf (Centre) 

 (5' (Star) 



24 

 24 



+ 1517-35 



+ 

 + 

 + 



.56 

 -39 



14.24 



+ 1532.54 



— 14-52 



— -29 



— -03 

 + 1517-70 



+ 25 17.70 



o 



25 



O.OD 

 17.70 



In the above example considerably more figures have been 

 written down than are reallj^ necessary, and all the multiplica- 

 tions have been done with Crelle's tables. The final jDlace of the 

 star is of course very much more accurate than the place 

 originally obtained from the meridian observations. 



I now give for comparison the places derived as above for all 

 the stars, together with the discordances from the meridian places 

 taken in the sense " meridian minus photographic." The column 

 headed " H " contains the corresponding residual as obtained 

 by M. Henry. 



Right Ascension. 



Declination. 1 







Merid— Photo. 







Mexid— Photo. 





Jac. 1 H. 



J-H. 



Jac. 



H. 



J-H. 



I 



h 111 s 

 05931-449 



— .069 



— .064 



—.005 



-h24 25 i7'.'7o ; +a5o 



+o'54 



— c^.'o4 



2 



05959-393 



—.023 



— .019 



—.004 



23 56 5r. 28 , —0.18 



— 0.20 



-I-0.02 



3 



I I 1.002 



+ .048 



-I-.052 —.004 



2422 8.73 j -fo.97 



-I-1.02 



—0.05 



4 



I 141-659 



+.051 



+ -054 —.003 



241823.93 —1.33 



— I-3I 



— 0.02 



5| I 2 4.627 



—.017 



— .014 ! —.003 



24 26 21.20 1 -I-0.30 



+0.33 



-0.03 



6 I 3 52.866 



+.054 



-^.0^3 -l-.ooi 



23 55 30.97 i —0.87 



— 0.91 



4-0.04 



7 I 414941 



—.081 



—.084 i -f .003 



231541.78 



4-0.22 



-I- 0.20 



-f-0.02 



8 



I 4 16.068 



+.052 



-I-.050 -|-,O02 



2359 5-82 



— 0.12 



-^.16 



-f-0.04 



9 



I 656.967 



+-073 



-I-.067 -(-.006 



24 2.34 



+0.56 



+0.52 



-ho.04 



xo 



I 755-052 



—.052 



— ;054 1 -f-.002 



245549.88 



^.22 



^.19 



—0.03 



II I 8 7.176 



—.036 



— .040 I -I-.OO4 



242832.16 -I-0.14 



+0.16 



— 0.02 



