53 
and positions 0/4,58 double and triple stars, &c. 
No. CCCCXLVI. R. A. 4 h 7 ™ ; Decl. 7 0 55 ' S. 
40, Eridani ; Struve, 116 ; 
Double ; 6th and 10th magnitudes ; small, blue. 
Passy ; December 10 , 1824 ; Seven-feet Equatorial. 
Position = 1 8° i8 / sf | 7 Obs. | Diff. = i° 16' ? £ . , difficult 
Distance = i' 24".6 97 ± ; Single measure j excessively aimcuit. 
No satisfactory measures of distance can be procured ; the deposition of mois- 
ture upon the object-glass is so considerable, notwithstanding a tube* twelve inches 
long is adapted to the object-end of the telescope, that I am obliged to wipe it 
every few minutes. The stars, even those of low altitude, are unusually steady : 
were it not for the annoyance of the dew, stars presenting almost any degree of 
difficulty might be well observed to night. Thermometer stands at 24 0 . The 
instrument is covered with hoar frost. 
Passy ; December 22 , 1824 ; Seven-feet Equatorial. 
5th, and 9th or 10th magnitudes. 
Diff = C'.oL } ° n the meridian ‘ 
Measures extremely difficult. Stars so remarkably steady, that they may be kept 
bisected by the wire almost as long as I please. The wind is blowing a perfect 
hurricane ; and fearing that a perseverance in observing, may occasion the destruc- 
tion of the observatory, I am obliged, although reluctantly, to discontinue working. 
Scarcely ever do I remember to have seen such opportunities for making delicate 
observations, as the chasms between transient clouds have presented this evening. 
Passy ; December 23 , 1824 ; Seven-feet Equatorial. 
6th and 10th magnitudes. 
Position — 17 0 45' sf. Single observation. Excessively difficult. 
The night suddenly has become bad ; the small star is no longer visible. 
Position = 17 0 34' sf 5 Obs. 
Distance — 1' 24". 178 5 Obs. 
Passy ; January 28 , 1825 ; Seven-feet Equatorial. 
6th and 10th magnitudes. 
Position rz 
Distance zz 
17° 56' sf 
1' 25". 279 
5 Obs. 
5 Obs. 
Diff. — o° 29' ] u . , 
Diff. = o". 9 62 j Excessivel y 
difficult. 
Mean Result. 
Position 17 0 58' 5/(18 Obs.) ; Epoch 1824.99 ; 
Distance 1' 24''. 726 (11 Obs.) ; Epoch 1825.00. 
* The tube first employed for this purpose was made of pasteboard : the dew 
however was frequently so copious that its figure became deranged, and it could 
with difficulty be re-applied to the object-end of the telescope. Under these cir- 
cumstances, the veneered deal of which the English hat-box is constructed, afforded 
a material not liable to this inconvenience — its pliability rendered it easy to add 
one cylinder to another, so as to form a tube of any desired length, its weight at the 
same time very slightly disturbing the equilibrium of the telescope. 
