24 6 Mr, South’s observations of the apparent distances 
No. DCCXXXVI. continued. 
Measures of A C. 
Blackman-street ; July 4, 1824 ; Five- feet Equatorial. 
6th and 7th magnitudes. 
Position = 43° 16' s p 5 Obs. I Diff. = o° 13' ) 
Distance = 1' 10". 402 5 Obs. j Diff. = o".432 ) 
Passy ; November 3, 1824 ; Seven-feet Equatorial. 
6th and 7th magnitudes. 
Position = 43° 39 ' sp 5 Obs. Diff. = i° 40' } 
Distance = 1' 9". 839 5 Obs. Diff. = 1 "-635 5 
Passy ; August 12, 1825 ; Seven-feet Equatorial. 
Position 
Distance 
7| and 8th magnitudes. 
42 0 39' sp 
I' 1 o".Q22 
5 Obs. 
5 Obs. 
Diff. = o° 31' 
Diff. =r 1". 755 
j> Unsteady. 
Mean Result. 
of A B. Position 57 0 58' np (15 Obs.) ; 
Distance n".777 (*5 Obs.) 
of AC. Position 48° 11' sp (15 Obs.); 
Distance 1' io".o88 (15 Obs.) 
Epoch 1824.98. 
Sir W. Herschel has no measures of the positions of these 
stars. The distance of A B he makes 1 1 " 4'", agreeing pretty 
well with the present ; while that of A C is stated by him at 
59" 49 w , a convincing proof of some cause of error in the 
micrometer when opened to considerable distances, and which 
has been already alluded to. What this cause of error may 
have been, whether parallax, or the resistance of a spiral 
steel spring straining the threads of the screw immoderately, 
it is useless now to enquire ; but the whole tenor of the 
observations goes to prove, that distances less than 20 or 30" 
are not affected by it. (H.) 
