732 EAEL or EOSSE ON THE CONSTEUCTION OF SPECULA OF 6-FEET APEETUEE, 
Number in 
Number 
Hersehel’s 
of times 
Catalogue. 
observed. 
19361 
o ^ 
1937/ 
J 1 
1938 
3 I 
1939 
1 J 
19421 
'i 1 
1943/ 
4 i 
1946 
11 1 
j 
j 
1947 
2 
1950 
1 t 
1952 
1 
1953 
1 
1958 
1 
1960^1 
1962 > 
1963 J 
2 
1964 
1 
1 1968 
1 
1 
1 
1 
1 
1 
1969 
2 
1970 
8 
1971 
1972 
1979 
1981 
2 
1983 
1989 
1 
2019 
2023 
11 
2036 
2037 
5 
2042 
2043 
2 
2045 
3 
2046 
2047 
7 
Description- 
Like 450 ; dark ring plainer seen on p. part of neb ; very S. n ; about -I diameter 
of neb. off. The f. part of dark ring a little broader than the p. part. May 3, 1851. 
Distance between nucleus and S. * 
Dist. 
May 3, 1851. 0' 26" 
0 32 . 
0 31 s ^ — 2 -N 
Pos. Dist. ^ 
May 4, 1851. 7° 0' 25" 
5 0 28 
7 0 28 
■ 29, 1851. The S. * scarcely seen ; dark ring not at all. Apr. 3, 1854. The dark ring 
round'hucleus seen pretty well ; also the minute * n. of neb. See fig. 32, Plate XXVIll. 
Another near. 
19, 1855. S; F; E; bM. Another neb. 4' nf. 
Hercules. May 6, 1850. Seems to have a dark streak across the B. part a little above 
the centre. Apr. 6, 1851. Dark lanes seen which bear some resemblance to those 
in Neb. Andr. Apr. 27, 1851. Sketch made; dark spaces seen through mist. 
May 3, 1851. Sketched. May 26, 1851. Sketched. Apr. 17, 1855. The dark lanes 
are quite discernible in the finder eyepiece ; they do not meet in the centre of the 
cl, but to sff. of it (see fig. 33, Plate 
Apr. 19, 1855. The nucleus is nearest the p. edge, and light mottled. 
May 5, 1850. Intense blue centre fading off to some distance aU around; S. *s to nf, to 
which neb. nearly extends. May 12, 1850. I fancied once or twice there were pro- 
jections p. and f. (N.B. The existence of these not satisfactorily proved.) 
cl ; in finder eyepiece the branches have a slight spiral appearance, 
cl ; May 30, 1851. A dark lane above the centre quite across, or rather the upper one- 
sixth of cliLster is much fainter than the rest, 
cl ; June 3, 1851. The outhne not E ; on s. side is an outlying portion separated from 
the chief portion by a dark passage. 
May 31, 1851. I suspect annular, but twilight leaves me quite uncertain; n. edge is the 
brightest. June 3, 1851. Annular, n. edge is the brightest, 
cl ; *s S. and very close together. 
May 29, 1851. Seen in twilight ; looked very like a # of 9th mag. 
cl. 
Never well seen on account of twilight. Nothing additional since 1844, except a pB. * 
sf. middle, 
cl. 
Aug. 28, 1850. Annular or perhaps spiral, and * distinctly seen in dark part. The dark 
space is undoubtedly irregular in its form. Aug. 24, 1851. Annular; centre very 
suddenly darker than the rest of the neb ; vS. * in np. edge of central part, 
cl. 
Aug. 1, 1851. 4 ^^s in neb, and 2 more on p. edge. 
On verj' bad nights, 
cl. 
Aug. 31, 1850. Centre rather dark. Aug. 1, 1851. The dark part is a little np. middle. 
