ASTRONOMICAL OBSERVATIONS. 
11 
APPENDIX A—Continued. 
CAMP 38 A—AUGUST 29, 1855. 
Observer — Lieut. H. L. Abbot, U. 'S. Top. Engineers. 
Object observed. 
Time of observ’n 
by chronometer 
Observed double 
altitudes. 
h. 
m. 
s. 
d. 
m. 
s. 
Arcturus...... 
8 
38 
10.0 
56 
40 
00 
8 
39 
25.5 
56 
13 
30 
8 
43 
39.0 
56 
41 
10 
8 
44 
43.0 
54 
18 
30 
8 
45 
39.0 
53 
57 
30 
8 
46 
46.5 
53 
34 
50 
Polaris... 
9 
04 
51.0 
87 
34 
20 
9 
06 
12.5 
87 
36 
00 
9 
07 
12.0 
87 
37 
20 
9 
08 
24.5 
87 
38 
10 
9 
09 
26.0 
87 
38 
40 
9 
10 
39.0 
87 
39 
10 
9 
12 
47.0 
87 
40 
00 
9 
14 
31.0 
87 
41 
50 
9 
15 
35.5 
87 
42 
30 
9 
16 
29.5 
87 
43 
40 
9 
17 
31.0 
87 
44 
50 
9 
18 
39.5 
87 
45 
40 
9 
19 
40.0 
87 
46 
40 
Index error—6' 45". Barometer, 25.7 in. Thermome¬ 
ter, 420. 
CAMP 38 A—AUGUST , 1855. 
Observer — Lieut. H L. Abbot, U. S. Top. Engineers. 
h. m. s. 
d. m. s. 
Sun’s lower limb ...... 
8 27 59.0 
57 00 00 
8 28 24.5 
57 10 00 
8 28 52.5 
57 20 00 
8 29 22.5 
57 30 00 
8 29 52.0 
57 40 00 
8 30 20.5 
57 50 00 
8 30 49.0 
58 00 00 
8 31 18.5 
58 10 00 
8 31 45.5 
58 20 00 
8 32 15.0 
58 30 00 
8 32 44.5 
58 40 00 
8 33 12.5 
58 50 00 
8 33 42.5 
59 00 00 
Sun’s lower limb. 
4 11 09.0 
59 00 00 
4 11 36.5 
58 50 00 
4 12 06.5 
58 40 00 
4 12 32.0 
58 30 00 
4 13 00.0 
58 20 00 
4 13 29.0 
58 10 00 
4 13 59.0 
58 00 00 
4 14 29.0 
57 50 00 
4 14 58.0 
57 40 00 
4 15 25.5 
57 30 00 
4 15 54.0 
57 20 00 
4 16 25.0 
57 10 00 
4 16 53.5 
57 00 00 
Sun’s lower limb. 
12 17 23.0 
110 14 20 
12 18 15.0 
110 15 10 
12 19 02.5 
110 15 50 
12 20 56.0 
110 16 10 
12 21 42.5 
110 16 20 
12 22 33.5 
110 16 30 
12 23 21.0 
1 9 95 08.5 
110 16 50 
llfi lfi 30 
CAMP 38 A—AUGUST 30 
Observer —Lieut. H. L. Abbot, 
, 1855—Continued. 
U. S. Top. Engineers. 
Object observed. 
Time of observ’n 
Observed double 
by chronometer. 
altitudes. 
h. 
m. 
s. 
d. 
m. 
S. 
Sun’s lower limb. 
12 
25 
59.5 
110 
16 
10 
12 
26 
31.5 
110 
15 
30 
12 
27 
31.5 
no 
15 
00 
12 
28 
13.5 
no 
14 
30 
a Cygni.... 
8 
04 
39.0 
130 
40 
30 
8 
06 
03.5 
131 
10 
40 
8 
07 
51.5 
131 
49 
10 
8 
09 
14.5 
132 
19 
10 
8 
10 
17.0 
132 
42 
30 
8 
11 
18.0 
133 
02 
30 
Arcturus... 
8 
16 
19.5 
63 
08 
50 
8 
17 
52.0 
62 
33 
20 
8 
18 
52.0 
62 
12 
00 
8 
19 
53.5 
61 
47 
30 
8 
20 
52.5 
61 
27 
30 
8 
21 
45.5 
61 
11 
10 
Polaris.. 
8 
24 
57.5 
87 
06 
30 
8 
26 
34.0 
87 
07 
00 
8 
29 
32.5 
87 
10 
00 
8 
30 
47.5 
87 
11 
00 
8 
32 
26.5 
87 
11 
50 
8 
33 
41.0 
87 
12 
50 
8 
34 
57.0 
87 
13 
20 
8 
36 
20.5 
87 
14 
00 
8 
37 
26.5 
87 
14 
40 
8 
38 
33.5 
87 
15 
50 
8 
39 
51.5 
87 
17 
00 
8 
41 
14.5 
87 
18 
20 
8 
43 
01.5 
87 
19 
50 
8 
44 
16.5 
87 
21 
10 
Altair... 
9 
22 
20.5 
109 
39 
50 
9 
23 
22.5 
109 
42 
10 
9 
24 
22.5 
109 
43 
10 
9 
25 
20.5 
109 
44 
00 
9 
26 
52.0 
109 
46 
00 
9 
29 
14.5 
109 
47 
20 
9 
30 
07.5 
109 
47 
30 
9 
31 
14.5 
109 
47 
50 
9 
32 
08.0 
109 
47 
50 
9 
33 
05.0 
109 
47 
30 
9 
34 
10.0 
109 
46 
00 
9 
35 
15.5 
109 
45 
50 
9 
36 
19.5 
109 
44 
00 
Index error — 6' 45". 
Barometer, 25.8 
in. Thermome- 
ter, 350. 
CAMP 38 A- 
-SEPTEMBER 1, 
1855. 
Observer —Lieut. H. L. Abbot, 
U. S. Top. Engineers. 
h. 
m. 
s . 
d. 
m. 
S 
Sun’s lower limb. 
9 
ii 
29.5 
64 
00 
00 
9 
12 
00.5 
64 
10 
00 
9 
12 
28.5 
64 
20 
00 
9 
12 
59.0 
64 
30 
00 
9 
12 
29.0 
64 
40 
(1(1 
9 
13 
59.0 
64 
50 
00 
9 
14 
29.0 
65 
00 
00 
9 
14 
58.5 
65 
10 
00 
9 
15 
27.5 
65 
20 
00 
9 
15 
58.5 
65 
30 
00 
