LOED OXMANTOWN ON THE GEEAT NEBULA IN OEION. 
59 
down by eye-measurement. The measures were taken with a wire micrometer without 
illumination, the parallel wires being bars inch in breadth, formed each of four wires 
laid side by side ; the position wire was a silk thread about yy inch thick. The instru- 
ment generally used for these measures was an equatoreal of 18 inches aperture and 
10 feet focal length, driven by a water-clock movement, as described in the Monthly 
Notices of the Astronomical Society for 1866. Two measures only were taken, when 
they were found to agree pretty well ; the object being, not to place the stars with the 
utmost accuracy, but to lay them down so near their true position that the drawing of 
the nebula might not be distorted to any appreciable extent. 
Those stars which are marked (M) have been determined by micrometrical measure- 
ment, the remaining ones by eye-estimation. The stars marked (H) have been 
inserted by Mr. Hunter. 
This list does not contain all the stars which can be seen within the limits of the 
drawing. The positions given in the following list are taken from the accompanying 
Skeleton Map by the method which Herschel describes (Cape Observations, Sect. 58). 
AAt from 69. 
— A Declination. 
Approximate 
magnitude. 
0i 
-36 
40 
-15 
55 
M 
10 
Distance only from lyn mea- 
On 
-36 
25 
+ 6 
40 
10 
sured. 
Out 
-36 
0 
+ 13 
30 
M 
10 
OlT 
-35 
20 
-17 
20 
13 
0v 
-34 
55 
-17 
40 
13 
Oyx 
—34 
55 
+ 7 
35 
11 
Ovn 
-33 
45 
- 4 
15 
12 
Ovill 
—33 
20 
— 11 
30 
9 
l t 
-30 
30 
+ 3 
35 
13 
In 
-29 
5 
- 4 
50 
11 
lm 
-28 
40 
+ 5 
25 
11 
lull 
-27 
55 
+ 1 
45 
10 
lr 
—26 
55 
+ 14 
0 
13 
lvr 
— 26 
45 
— 1 
20 
12 
lvu 
-26 
55 
—22 
25 
M 
10 
lym 
-26 
30 
-39 
20 
M 
8 
Inc 
-26 
10 
— 10 
0 
12 
lx 
—26 
10 
+ 17 
10 
12 
lxi 
— 25 
5 
- 3 
30 
M 
10 
lxn 
-23 
0 
+ 8 
0 
13 
lxm 
-23 
0 
- 7 
30 
13 
lxxv 
-23 
0 
+ 13" 
20 
M 
8 
2i 
-22 
5 
— 22 
55 
M 
9 
8u 
-21 
10 
— 13 
55 
14 
2m 
-21 
0 
-19 
45 
14 
2 iv 
— 20 
45 
— 18 
50 
14 
4 t 
-20 
0 
+ 5 
45 
H 
9 
4n 
— 18 
50 
-12 
20 
15 
4iii 
-18 
20 
-13 
5 
14 
4mr 
-18 
10 
— 13 
40 
13 
4y 
-17 
30 
+ 12 
30 
H 
9 
4vr 
-17 
5 
+ 8 
55 
H 
12 
9i 
-14 
30 
-29 
10 
12 
13 r 
— 12 
20 
+ 8 
15 
H 
12 
I6i 
— 12 
5 
— 1 
55 
H 
13 
16„ 
— 12 
0 
+ 10 
35 
H 
13 
k 2 
