EARL ROSSE’S OBSERVATIONS ON THE NEBULA. 
511 
I 
well defined, as all impediments to vision seem to affect nebulae much more than stars 
the light of which would be estimated as of the same intensity. In the foregoing list 
the greatest discrepancies are in the measures of bright objects, and this is probably 
the proper account of it. No stars have been inserted in the sketch which are not in 
the table of measurements. The general appearance of the object would have been 
better given if the minute stars had been put in from the eye-sketch, but it would 
have created confusion. 
Plate XXXV. fig. 2, H. 1173. — This nebula has been repeatedly observed with the 
6-feet instrument. 
March 11, 1848. — Spiral with a bright star above; a thin portion of the nebula 
reaches across this star and some distance past it. Principal spiral at the bottom, 
and turning towards the right. 
March 20, 1848. — Spiral! ty very evident, though night bad: nebula not traced to 
upper star. 
April 16, 1849. — Took measures of the stars 1, 2. 
April 17, 1849. — Took measures of the stars 1, 2, 3, 4 from the nucleus; they are 
as follows : — 
No. 
Mean of obser- 
vations of posi- 
tion from north 
in direction 
n.f. s.p. 
No. of 
observa- 
tions. 
Greatest differ- 
ence between 
mean and obser- 
vation. 
Mean of obser- 
vations of 
distance. 
No. of 
observa- 
tions. 
Greatest differ- 
ence between 
mean and obser- 
vation. 
1. 
O / 
34 1 
1 
o f 
2 54-6 
2 
// 
9-6 
2. 
80 35 
2 
0 18 
1 46-3 
3 
14-4 
3. 
117 3 
3 
0 23 
1 48-4 
4 
13 6 
4. 
177 57 
1 
2 48-1 
1 
Three very minute stars in the eye-sketch have not been inserted, not having been 
measured. 
Plate XXXVI. fig. 3, H. 604. — This nebula was observed frequently with the 3-feet 
instrument, but nothing remarkable seems to have been made out, except the resol- 
vable character of the nucleus. It was first observed with the great telescope, March 
24, 1846, and a tendency to an annular or spiral arrangement discovered; night 
bad; March 5, 1848, sketched. 
March 9, 1848. — ‘‘Night excellent, a spiral seen in an oblique direction, resolved 
well, particularly towards the centre, where it is very bright ; Dr. Robinson ob- 
serving.” Observed March 3, 1850; badly seen. 
With the single exception of March 3, 1850, we have unfortunately no recent ob- 
servation of this extraordinary object : it has been passed over, because to observe 
it, except on a very fine night, would be waste of time. 
Plate XXXVI. fig. 4, H. 2205.^ — Observed frequently, and by many friends. The 
drawing represents the object with considerable accuracy. 
“September 10, 1849. — Spiral, but query whether this is not more properly an 
annular than a spiral nebula.” 
