ASTRONOMICAL OBSERVATIONS, 
7 
APPENDIX A—Continued. 
CAMP 22—AUGUST 7, 1855—Continued. 
CAMP 23—AUGUST 9, 1855. 
Observer —Lieut. R. S. Williamson, U. S. Top. Engineers. 
Object observed. 
Time ofobserv’n 
by chronometer. 
Observed double 
altitudes. 
h. 
m. 
s. 
d. 
m. 
s. 
a Serpentarii. 
8 
21 
54.0 
123 
23 
30 
8 
22 
53.0 
123 
22 
50 
8 
24 
21.0 
123 
22 
10 
8 
25 
37.0 
123 
20 
50 
Polaris. 
8 
40 
48.0 
81 
12 
50 
8 
42 
37.5 
81 
14 
40 
8 
43 
41.0 
81 
15 
20 
8 
44 
39.0 
81 
16 
50 
8 
45 
23.0 
81 
17 
10 
8 
46 
18.0 
81 
17 
30 
8 
47 
15.5 
81 
18 
40 
8 
48 
32.0 
81 
19 
20 
8 
49 
39.5 
81 
19 
50 
8 
50 
59.5 
81 
20 
20 
Index error — G' 30". Barometer, 26.0 in. Thermome¬ 
ter, 64°. 
CAMP 23—AUGUST 8, 1855. 
Observer —Lieut. R. S. Williamson, U. S. Top. Engineers. 
h. 
m. 
s. 
d. 
Til. 
s. 
a Cygni. 
8 
24 
52.5 
115 
27 
20 
8 
26 
24.5 
115 
57 
10 
8 
28 
18.0 
116 
38 
10 
8 
29 
24.5 
117 
00 
30 
8 
30 
38.5 
117 
25 
40 
8 
31 
43.5 
117 
49 
40 
Arcturus. 
7 
57 
35.5 
92 
20 
00 
7 
59 
24.5 
91 
49 
40 
8 
00 
41.5 
91 
12 
00 
8 
01 
56.5 
90 
44 
50 
8 
03 
25.0 
90 
12 
40 
8 
04 
29.5 
89 
49 
20 
a Serpentarii. 
8 
10 
31.0 
122 
49 
00 
8 
11 
34.0 
122 
50 
10 
8 
13 
13.5 
122 
51 
00 
8 
14 
33.0 
122 
51 
10 
8 
15 
49.0 
122 
51 
30 
8 
16 
56.5 
122 
51 
20 
8 
17 
58.0 
122 
51 
00 
8 
18 
57.0 
122 
50 
00 
8 
20 
23.5 
122 
49 
20 
8 
21 
29.5 
122 
49 
10 
Polaris.. 
8 
39 
02.0 
81 
47 
20 
8 
40 
25.0 
81 
48 
30 
8 
41 
20.0 
81 
49 
20 
8 
42 
07.5 
81 
50 
00 
8 
43 
03.5 
81 
50 
10 
8 
44 
18.0 
81 
51 
40 
8 
46 
14.5 
81 
53 
00 
8 
47 
24.5 
81 
54 
00 
Index error—6 r 30". Barometer, 25.9 in. Thermometer, 
720 . 
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 
ii 
19.0 
91 
00 
00 
9 
ii 
48.0 
91 
10 
00 
9 
12 
13.5 
91 
20 
00 
9 
12 
44.5 
91 
30 
00 
9 
13 
13.5 
91 
40 
00 
9 
13 
43.0 
91 
50 
00 
9 
14 
10.5 
92 
00 
00 
9 
14 
39.5 
92 
10 
00 
9 
15 
10.0 
92 
20 
00 
9 
15 
39.5 
92 
30 
00 
9 
16 
06.0 
92 
40 
00 
9 
16 
36.0 
92 
50 
00 
9 
17 
07.0 
93 
00 
00 
Sun’s lower limb. 
2 
43 
20.0 
93 
00 
00 
2 
43 
50.5 
92 
50 
00 
2 
44 
18.0 
92 
40 
00 
2 
44 
47.0 
92 
30 
00 
2 
45 
17.0 
92 
20 
00 
2 
45 
46.5 
92 
10 
00 
2 
46 
16.5 
92 
00 
00 
2 
46 
47.0 
91 
50 
00 
2 
47 
14.0 
91 
40 
00 
2 
47 
42.0 
91 
30 
00 
2 
48 
10.0 
91 
20 
00 
2 
48 
37.5 
91 
10 
00 
2 
49 
08.5 
91 
00 
00 
Sun’s lower limb. 
11 
55 
02.0 
128 
42 
20 
11 
56 
01.5 
128 
43 
20 
11 
57 
27.0 
128 
44 
20 
11 
58 
21.5 
128 
44 
55 
11 
59 
06.0 
128 
45 
10 
11 
59 
54.5 
128 
45 
20 
12 
01 
00.5 
128 
45 
15 
12 
02 
07.0 
128 
45 
10 
12 
03 
40.0 
128 
44 
30 
12 
04 
58.0 
128 
42 
55 
12 
05 
58.0 
128 
41 
50 
Index error—6' 30". Barometer, 25.8 in. Thermometer, 
710.5. 
CAMP 24—AUGUST 10, 1855. 
Observer —Lieut. R. S. Williamson, U. S. Top. Engineers. 
k. 
m. 
s. 
d. 
m. 
s. 
a Cygni.„. 
8 
45 
20.5 
123 
56 
40 
8 
46 
25.0 
124 
19 
50 
8 
4S 
29.5 
125 
03 
20 
8 
49 
59.0 
125 
35 
30 
8 
51 
02.0 
125 
58 
00 
8 
52 
10.0 
126 
22 
10 
Arcturus... 
8 
36 
38.0 
76 
33 
50 
8 
38 
04.5 
76 
02 
10 
8 
39 
10.5 
75 
37 
10 
8 
40 
15.0 
75 
13 
30 
8 
41 
44.0 
74 
40 
20 
42 
40.5 
74 
19 
20 
Polaris.,,,... 
8 
26 
25.5 
81 
57 
40 
8 
27 
35.5 
81 
58 
30 
28 
19.5 
81 
59 
50 
