ASTRONOMICAL OBSERVATIONS. 
9 
APPENDIX A—Continued. 
CAMP 28—AUGUST 16, 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. 
Sun’s lower limb. 
9 
42 
26.0 
93 
00 
00 
9 
42 
57.5 
93 
10 
f'O 
9 
43 
30.0 
93 
20 
00 
9 
43 
58.5 
93 
30 
00 
9 
44 
30.5 
93 
40 
00 
9 
45 
03.0 
93 
50 
00 
9 
45 
35.0 
94 
00 
00 
9 
46 
05.0 
94 
10 
00 
9 
46 
38.5 
94 
20 
00 
9 
47 
10.0 
94 
30 
00 
9 
47 
40.5 
94 
40 
00 
9 
48 
12.0 
94 
50 
00 
9 
48 
44.0 
95 
00 
00 
Sun’s lower limb. 
2 
38 
35.0 
95 
00 
00 
2 
39 
08.5 
94 
50 
00 
2 
39 
40.0 
94 
40 
00 
2 
40 
12.0 
94 
30 
00 
2 
40 
44.0 
94 
20 
00 
2 
41 
14.0 
94 
10 
00 
2 
41 
47.5 
94 
00 
00 
2 
42 
17.0 
93 
50 
00 
2 
42 
49.5 
93 
40 
00 
2 
43 
21.0 
93 
30 
00 
2 
43 
51.5 
93 
20 
00 
2 
44 
24.0 
93 
10 
00 
2 
44 
55.5 
93 
00 
00 
Sun’s lower limb... 
12 
06 
28.5 
122 
27 
30 
12 
07 
12.5 
122 
29 
50 
12 
08 
23.0 
122 
30 
50 
12 
09 
02.0 
122 
30 
50 
12 
09 
34.5 
122 
31 
10 
12 
10 
17.5 
122 
31 
50 
12 
10 
54.0 
122 
32 
20 
12 
11 
37.5 
122 
32 
50 
12 
12 
19.0 
122 
33 
10 
12 
12 
52.5 
122 
32 
50 
12 
13 
34.0 
122 
32 
30 
12 
14 
52.5 
122 
31 
50 
12 
15 
33.5 
122 
31 
30 
12 
16 
23.5 
122 
31 
00 
12 
17 
27.5 
122 
30 
20 
12 
18 
12.5 
122 
30 
00 
a Cygni...... 
8 
25 
33.0 
128 
56 
00 
8 
27 
18.0 
129 
25 
20 
8 
28 
37.5 
130 
05 
30 
8 
29 
53.5 
130 
34 
50 
8 
31 
05.0 
131 
01 
00 
8 
32 
13.0 
131 
25 
40 
Arcturus. 
8 
12 
35.5 
80 
18 
50 
8 
15 
24.5 
79 
15 
00 
8 
16 
44.5 
78 
47 
30 
8 
19 
29.0 
77 
46 
30 
8 
20 
57.5 
77 
14 
20 
8 
22 
19.0 
76 
47 
40 
Polaris. 
8 
37 
25.5 
83 
57 
10 
8 
39 
32.0 
83 
58 
50 
8 
41 
24.0 
84 
00 
00 
8 
42 
54.5 
84 
01 
30 
8 
43 
57.0 
84 
02 
20 
8 
45 
17.5 
84 
04 
00 
Index error — 6' 30". 
ter, 67°.0. ' 
Barometer, 26.0 
in. Thermome- 
CAMP 30—AUGUST 19, 1855. 
Observer —Lieut. R. S. Williamson, 17. S. Top. Engineers. 
Object observed. 
a Cygni. 
Arcturus. 
Polaris. 
Time of observ’n 
by chronometer. 
Ii. 
8 
8 
8 
Observed double 
altitudes. 
TO. 
s. 
d. 
TO. 
s. 
12 
22.0 
121 
46 
30 
13 
53.0 
122 
19 
30 
15 
17.0 
122 
46 
40 
16 
22.0 
123 
11 
00 
17 
37.5 
123 
36 
30 
19 
13.0 
124 
11 
00 
03 
09.0 
79 
30 
20 
04 
49.5 
78 
53 
10 
06 
02.5 
78 
26 
20 
07 
02.0 
78 
05 
20 
08 
38.0 
77 
29 
50 
09 
51.0 
77 
04 
10 
24 
43.0 
84 
22 
40 
25 
47.5 
84 
24 
10 
27 
02.0 
84 
25 
40 
28 
10.5 
84 
25 
40 
29 
22.0 
84 
27 
10 
30 
11.0 
84 
28 
00 
31 
03.0 
84 
28 
50 
31 
51.5 
84 
29 
10 
32 
51.5 
84 
30 
00 
33 
48.5 
84 
30 
40 
Index error — 6' 30" 
meter, 54°.5. 
Barometer, 25.9 in. Thermo- 
CAMP 31—AUGUST 20, 1855. 
Observer —Lieut. R. S. Williamson, U. S. Top. Engineers. 
a. Cygni. 
Arcturus. 
Polaris. 
meter, 58°.5. 
h. 
m. 
5 . 
d. 
m. 
s. 
8 
15 
46 
5 
124 
26 
10 
8 
17 
13 
0 
124 
56 
40 
8 
18 
37 
5 
125 
26 
10 
8 
20 
04 
0 
125 
57 
10 
8 
21 
14 
5 
126 
21 
10 
8 
22 
28 
5 
126 
46 
00 
7 
58 
46 
0 
79 
38 
10 
8 
00 
15 
5 
79 
06 
20 
8 
01 
46 
0 
78 
32 
30 
8 
02 
31 
0 
78 
13 
00 
8 
03 
44 
5 
77 
50 
10 
8 
04 
48 
0 
77 
27 
30 
8 
38 
46 
0 
85 
05 
00 
8 
41 
00 
5 
85 
05 
10 
8 
42 
50 
5 
85 
07 
20 
8 
47 
42 
5 
85 
10 
30 
8 
48 
56 
0 
85 
12 
10 
8 
50 
15 
0 
85 
13 
40 
8 
51 
41 
0 
85 
14 
50 
8 
52 
54 
0 
85 
15 
10 
8 
54 
09 
0 
85 
16 
50 
8 
55 
06 
0 
85 
17 
50 
8 
56 
05 
0 
85 
18 
30 
8 
57 
04 
0 
85- 
19 
20 
Barometer 
25.6 in. Thermo- 
