386 Mr. South' s re-examination of seven double stars, made 



No. II. R. A. 4'' 21" ; Decl. 42° 39' N. 



57 m Persei ; H. and S. 44. 



Double ; 8th and 8| magnitudes. 



Sloane-street ; February 6, 1826 ; Seven-feet Equatorial. 



Position z: 70° 23' *p 1 7 Obs. I DifF. = 0° 43' ) p, » 

 Distance = i' 5o".269 | 7 Obs. DifF. = i".4i8> '-^o^^X- 



Stars only visible by glimpses, and when seen very unsteady. 



Sloane-street ; February 7, 1826 ; Seven-feet Equatorial. 

 8th and 8^ magnitudes. 



Position = 70° 2^ sp I 7 Obs. 

 Distance=i' 51". 192 | 7 Obs. 



Diff =0° 76 \ ^^^ ^^^^^^ and unsteady. 



Observed when 40 minutes west of the meridian. 



Sloane-street ; February 12, 1826 ; Seven-feet Equatorial. 



, 8th and 8^ magnitudes. 



Position = 70° 41' sp\ 7 Obs. I DifF. = 0° 43' ) Satisfactorv 

 Distance = 1' 5o".638 j 7. Obs. | Diff. = i".5i5 J i>atistactory. 



Observed when 70 minutes west of tj»e meridian; stars tolerably steady and well 



defined. 



Mean Result. 

 Position 70° 29' sp (21 Obs.) ; Distance 1' 50^.700 (21 Obs.)-, 



Epoch 1826.10. 

 Our former measures were. Position 71® '8^'' 5 />; Distance 

 1' 5o".i93 ; Epoch 1821.91; agreeing sufficiently with the 

 present determinations ta render it probable that the star is 

 liable to no very important change : it is true, the distance 

 here given differs 5-tenths of a second from that arrived at by 

 our joint observations, and that it lies in the right direction ; 

 still future observations must decide whether the discordance 

 between Sir W. Herschel's measure of distance and our own, 

 = 13". 77'', have any other foundation than instrumental- 

 error of the micrometer employed in 1 783.- 



