8 
ASTRONOMICAL OBSERVATIONS. 
APPENDIX A—Continued. 
CAMP 24—AUGUST 10, 1855—Continued. 
CAMP 27, A—AUGUST 13, 1855—Continued. 
Observer —Lieut. R. S. Williamson, V. S. Top. Engineers. 
Observer —Lieut. H. L. Abbot, 
U. S.Top. Engineers 
Object observed. 
Time 
of observ’n 
Observed double 
Object observed. 
Time 
of observ’n 
Observed double 
by chronometer. 
altitudes. 
by chronometer. 
altitudes. 
h. 
m. 
s. 
d. 
m. 
s. 
h. 
771 o 
S' 
d. 
771. 
s. 
8 
29 
15.0 
82 
00 
30 
Altair.,...... 
10 
19 
32.0 
112 
112 
49 
49 
50 
50 
8 
30 
04.0 
82 
01 
00 
10 
21 
35.0 
8 
30 
42.0 
82 
01 
20 
10 
23 
12.0 
112 
50 
00 
8 
31 
23.5 
82 
02 
00 
10 
25 
02.5 
112 
51 
50 
8 
31 
57.0 
82 
02 
00 
10 
26 
55.5 
112 
52 
00 
8 
32 
45.0 
82 
02 
40 
10 
29 
55.0 
112 
50 
00 
8 
33 
52.5 
82 
03 
30 
10 
31 
13.5 
112 
48 
40 
10 
32 
59.0 
112 
47 
30 
10 
34 
41.0 
112 
44 
10 
Index error ■—6'30”. Barometer, 25.1 in. Thermometer 
,78°. 
10 
36 
17.0 
112 
40 
00 
10 
37 
45.5 
112 
38 
10 
10 
39 
17.5 
112 
31 
50 
CAMP 25—AUGUST 11, 1855. 
10 
40 
40.0 
112 
30 
00 
Observer— Lieut. R. S, Williamson, U. S. Top. Engineers. 
Index error — 6' 30". 
Barometer, 26.0 in. Thermometer, 
570.5. 
h. 
m. 
5 
d. 
m. 
s. 
Polaris... 
8 
52 
40..5 
83 
04 
30 
8 
55 
24.0 
83 
05 
50 
8 
58 
28.0 
83 
08 
10 
8 
9 
59 
00 
31.5 
41.5 
83 
83 
09 
09 
00 
40 
CAMP 28—AUGUST 15, 1855. 
9 
9 
02 
04 
02.5 
06.5 
83 
83 
10 
12 
30 
30 
Observer —Lieut. H. L. Abb 
OT ? 
U. S. Top. Engineers. 
9 
05 
31.0 
83 
13 
10 
9 
06 
22.0 
83 
13 
30 
h. 
9 
07 
09.5 
83 
14 
40 
a Cygni... 
771. 
So 
d. 
771 . 
S' 
8 
48 
52 
38.0 
03.0 
128 
130 
58 
12 
20 
50 
8 
Index error — 6' 30”. 
Barometer, 25.4 in. Thermometer, 
8 
53 
31.5 
130 
40 
00 
640.5. 
8 
55 
12.5 
131 
18 
50 
8 
56 
42.5 
131 
47 
30 
8 
58 
59.5 
132 
37 
40 
CAMP 27, A 
—AUGUST 13, 
1855. 
Arcturus.............. 
8 
32 
17.0 
74 
32 
40 
8 
34 
11.0 
73 
50 
00 
Observer— Lieut. H. L. Abbot, 
U. S. Top. Engineers. 
8 
37 
27.5 
72 
38 
40 
8 
39 
38.5 
71 
50 
00 
8 
41 
31.5 
71 
06 
30 
h. 
m. 
s. 
d . 
m. 
S . 
8 
43 
57.0 
70 
16 
20 
a CygnL. ...... 
8 
46 
52.0 
125 
42 
40 
Polaris... 
8 
50 
27.5 
126 
59 
00 
9 
40 
23.5 
84 
42 
50 
8 
53 
08.5 
127 
54 
30 
9 
42 
51.5 
84 
43 
30 
8 
55 
26.0 
128 
45 
40 
9 
45 
25.5 
84 
46 
40 
8 
57 
40.5 
129 
30 
00 
9 
46 
48.5 
84 
47 
00 
8 
59 
46,0 
130 
16 
10 
9 
48 
25.0 
84 
47 
40 
9 
50 
05.0 
84 
48 
30 
Arcturus.... ........... 
9 
03 
17.0 
65 
49 
20 
Altair ................ 
9 
04 
49.0 
65 
IP 
00 
10 
04 
50.5 
112 
20 
00 
9 
05 
51.0 
64 
54 
20 
10 
06 
19.5 
112 
22 
50 
9 
07 
37.0 
64 
14 
00 
10 
08 
17.5 
112 
27 
00 
9 
08 
43.0 
63 
47 
40 
10 
10 
02.0 
112 
30 
00 
9 
09 
55.0 
63 
25 
00 
10 
11 
38.5 
112 
30 
30 
10 
12 
48.0 
112 
31 
00 
Polaris................. 
9 
14 
25.5 
83 
58 
50 
10 
16 
46.5 
112 
32 
30 
9 
17 
07.0 
84 
00 
00 
10 
17 
59.5 
112 
33 
20 
9 
18 
12.5 
84 
02 
00 
10 
19 
36.0 
112 
33 
30 
9 
20 
19.5 
84 
02 
50 
10 
21 
17.5 
112 
32 
50 
9 
22 
25.5 
84 
04 
30 
10 
22 
54.5 
112 
31 
20 
9 
24 
43.5 
84 
06 
30 
10 
25 
26.5 
112 
28 
00 
9 
25 
50.5 
84 
10 
00 
10 
27 
08.5 
112 
26 
10 
9 
28 
34.0 
84 
10 
50 
10 
28 
23.0 
112 
22 
40 
10 
31 
01.5 
112 
16 
40 
Altair....... .......... 
10 
09 
45.0 
112 
34 
30 
10 
11 
43.0 
112 
38 
20 
10 
13 
55.5 
112 
42 
50 
Index error — 6' 30”, 
Barometer, 25.9 
in. Thermome- 
10 
15 
48.0 
112 
48 
50 
ter, 62°,5, 
