140 
MR. RUMKER’S OBSERVATIONS 
1 a Centauri. (Ann. Var. — 15".971.) 
Superior Culmination. 
Inferior Culmination. 
1827. 
Barom. 
g 
Microscopes. 
1827. 
Barom. 
g 
Microscopes. 
i. 
II. 
in. 
IV. 
e 
i. 
II. 
III. 
IV. 
Dec. 12 
inches. 
29.58 
O 
87 
o / // 
30 7 52.5 
/ // 
7 51.4 
/ // 
8 1.4 
/ // 
8 8 
Dec. 16 
inches. 
30.224 
61.7 
o / // 
330 32 59 
/ // 
32 59.4 
✓ // 
33 2.6 
/ // 
33 0.0 
15 
30.25 
77 
/ 53.3 
„ 53.8 
„ 9.0 
„ 3 
Refract, and Reduct. 
-10 58.1 
10 58.1 
10 58.1 
10 58.2 
it; 
30.23 
78.7 
„ 8 0.0 
„ 53.7 
» 7.7 
» 7 
330 22 0.9 
22 1.3 
22 4.5 
22 1.8 
Dec. 14 
... Mean... 
30 7 55.3 
7 53.0 
8 6.0 
8 6.0 
Refract, and Reduct. 
-42.7 
42.6 
42.6 
42.6 
Superior Culminat. 
30 7 12.6 
7 10.4 
7 23.4 
7 23.4 
inferior Culminat... 
330 22 0.9 
22 1.3 
22 4.5 
22 1.8 
Half Diff. S. P. D. 
29 52 35.9 
52 34.5 
52 39.4 
52 40.8 
Mean S. P. D. of 1 a Centauri, Jan. 1, 1828 29° 52' 37".66 by 4 Observ. 
2 a Centauri. (Ann. Var. — 15".970.) 
Superior Culmination. 
1S22. 
Barom. 
i 
Microscopes. 
H 
i. 
II. 
III. 
IV. 
Nov. 28 
inches. 
30.06 
85 
o / // 
67 50 22.3 
/ // 
51 10.9 
/ // 
50 43.5 
/ // 
50 27.3 
29 
30.00 
85 
u » 23.1 
50 52.1 
„ 44.2 
„ 29.1 
Dec. 10 
29.78 
82 
» >» 23.7 
50 53.8 
„ 48.7 
„ 33.5 
13 
29.48 
84.5 
99 99 25.0 
50 53.4 
„ 49.3 
„ 31.4 
14 
29.60 
81 
„ „ 21.4 
50 50.5 
„ 46.2 
„ 32.4 
21 
30.00 
83 
„ „ 22.4 
51 7.0 
„ 49.7 
„ 32.1 
1823. 
Jan. 19 
29.87 
50 
» n 16.5 
51 0.5 
„ 45.0 
„ 30.3 
20 
30.02 
64 
„ ,, 24.0 
51 17.0 
„ 56.9 
„ 40.0 
Dec. 20 
... Mean ... 
67 50 22.3 
51 0.7 
50 48.0 
50 32.0 
Refract, and Rcduct. 
-1 52.4 
1 52.4 
1 52.4 
1 52.3 
Superior Culminat. 
67 48 29.9 
49 8.3 
48 55.6 
48 39.7 
Inferior Culminat... 
8 2 52.1 
3 24.2 
3 10.1 
2 48.2 
Half Diff. S. P. D. 
29 52 48.9 
52 52.0 
52 52.7 
52 55.7 
Inferior Culmination. 
1822. 
Barom. 
Therm. 
Microscopes. 
I. 
II. 
III. 
IV. 
Dec. 11 
15 
21 
24 
27 
inches. 
29.75 
29.62 
30.02 
29.92 
29.95 
o 
70.3 
68.0 
59.8 
76 
73.5 
o / // 
8 12 25.0 
» » 25 
» » 34.8 
„ „ 10.7 
„ „ 13.0 
/ // 
12 50 
12 53.5 
13 8.6 
/ // 
12 36.1 
„ 53.1 
„ 45.6 
/ // 
12 18.3 
„ 23.5 
„ 23.9 
„ 6.6 
„ 16.5 
12 43.3 
„ 24.2 
Dec. 19|... Mean... 
Refract, and Reduct. 
8 12 21.7 
-9 29.6 
12 53.8 
9 29.6 
12 39.75 
9 29.6 
12 17.8 
9 29.6 
8 2 52.1 
3 24.2 
3 10.1 
2 48.2 
Mean of 4 Microscopes 29° 52 ' 52".34 by 13 Observ. 
