190 



OBSERVATIONS ON NEBULA 



Date. 



stars. 



, , Altitude, or 

 ■^ Sid. Time. 



Correction 

 for Eefr. 



A 



n 



e 



Remarks. 



Dec. 10 



40 — 



103 





50^80 3'^ 42"^... 



52" 



1^28 





49^52 



2 



0^27 





" 13 



(( 







49.45 3 33 ... 



38 



0.82 





48 .63 



2 



0.16 





Nov. 8 



62 — 



103 





28.87 10°. ..8° 





0.40 





28.47 



4 



0.29 





Dec. 10 



(( 







29 .063"' 29™... 



52™ 



0.27 





28.79 



3 



0.48 





" 13 



<< 









28.95 3 33 ... 



38 



-f 0.23 







28.72 



2 



0.72 





Nov. 8 



65 — 



103 







23 .25 



10°. ..8° 





-1- 0.34 







22.91 



5 



0.29 





Dec. 10 



<( 







24 .20 3'' 29'"... 



52™ 



0.24 





23.96 



4 



0.50 





" 13 



t( 









23 .80 



3 33 ... 



38 



0.20 







23.60 



2 



0.69 





Nov. 8 



130 — 



103 



+ 



17.6 



8^° 





0.94 



+ 



18.54 



sinsf. 



meas. 





Dec. 10 



<( 





+ 



18.12 



3^ 29™... 



52™ 



0.43 



+ 



18.55 



4 



0.07 





a ii 



21 — 



103 





65.83 



i6 





0.24 





65.59 



3 



0.05 





^i 6( 



24 — 



103 





61.87 



a 





+ 0.34 







61 .53 



3 



0.53 





" 13 



133 — 



103 



+ 



21 .14 



2 39 ... 



42 



— 0.26 



+ 



20.88 



2 



0.57 





ti t( 



162 — 



103 



+ 



36.17 



(i 





— 0.26 



+ 



35.91 



2 



0.89 





Nov. 8 



101 — 

 31 — 



103 

 40 





2. + 

 9.44 



10°. ..7° 





-fl.l 

 0.25 





0.9 

 9.19 



4 





-No transits noted, because 

 their diff. of Decl. is greater 

 tlian tlie diameter of the 



0.42 



" 28 



<( 







9.85 



4'» 19™... 



22™ 



0.62 





9.23 



2 



0.33 



eye-piece, though not of the 

 micrometer. The diff. of 



Dec. 10 

 Dec. 13 



1 — 

 10 — 

 66 — 



40 

 40 



k Cygni 



+ 



9.00 

 68.20 

 36.25 

 10m 39 .7 



4 6 ... 

 2 7 & 4 



12 

 1 



-f 0.40 



— 0.60 



— 0.53 

 + 0.23 



+ 



8.60 



68.80 



36.78 



10™ 39 .93 



2 

 2 

 2 

 2 



0.23 

 0.43 

 0.38 

 0.70 



E. A. depends on this re- 

 mark from the Journal: — 

 "Star (101) = star (103) in 

 R. A. nearly; has several 

 times crossed about 2 s + 

 before it. 



» 16 



(( 





+ 



" 39 .0 



2 33 & 3 55 



+ 0.20 



+ 



«' 39 .20 



2 



0.85 





32. In the farther reduction of the foregoing observations, where several sets 

 of measures have been obtaineci between the same two stars, they have been 



n 



combined by assigning to each a weight proportioned to the value of — ; with 



some restrictions where either n otc e are so small as to render the weight very 

 minute on the one hand, or immensely large on the other. And wherever, as 

 is frequently the case, measures have been taken through a series of stars by 

 different steps and intervals of progress, so as mutually to check each other, 

 the most probable results have been deduced from their combination by the 

 method of minimum squares, and are given below. 



The first column contains the numbers of the stars in the catalogues, Arti- 

 cles 37, 38, and 39; the second and third, the differences of right ascension and 

 declination between the several measured stars and one assumed as a zero. 



Nebula h. 1991. 



stars. 



Diff. of R. A. 



Diff. of Decl. 



1 —9 



— O™ 28^81 



+ 15' 7".6 



2 — " 



" 7 .46 



-f 3 36 .3 



8 — " 



— " 0.52 



— 9 .0 



18 — " 



+ " 6 .39 



-f 1 5 .0 



21 — " 



+ " 7 .90 



-t- 3 59 .5 



Stars. 



Diff. of R. A. 



Diff. of Decl. 



22 — 9 



24 — " 



25 — " 



28 — " 



+ O™ 8^77 



" 11 .47 



" 11.83 



+ " 18 .04 



-f 7' 31".8 



— 1 10 .4 



-f 1 52 .8 



— 4 30 .7 



