ASTRONOMICAL OBSERVATIONS. 
13 
APPENDIX A—Continued. 
II. Observations on the routes of detached parties, in charge of Lieut. Ji. S. Williamson, U. S. 
Topographical Engineers. 
CAMP A—AUGUST 13, 1855. 
Observer —Lieut. R S. Williamson, U. S. Top. Engineers. 
Object observed. 
Time of observ’n 
by watch. 
Observed double 
altitudes. 
h. 
m. 
s. 
d. 
m. 
5. 
a Cygni. 
8 
13 
16.4 
116 
19 
00 
8 
14 
37.2 
116 
48 
20 
8 
16 
00.0 
117 
16 
50 
8 
17 
32.0 
117 
49 
00 
8 
19 
00.0 
118 
19 
20 
8 
20 
18.4 
118 
47 
10 
Arcturus. 
8 
02 
36.8 
85 
15 
10 
8 
04 
33.2 
84 
32 
30 
8 
05 
32.8 
84 
11 
00 
8 
06 
21.2 
83 
52 
50 
8 
07 
21.2 
83 
30 
40 
8 
08 
14.4 
83 
10 
50 
Polaris. 
8 
24 
48.8 
82 
46 
40 
8 
26 
36.0 
82 
48 
40 
8 
28 
30.0 
82 
49 
10 
8 
29 
56.0 
82 
50 
00 
8 
31 
09.6 
82 
51 
00 
S 
33 
05.6 
82 
53 
10 
Index error — 0' 30". Barometer, 26.0 in. Thermome¬ 
ter, 80°. 
CAMP B—AUGUST 14, 1855. 
Observer —Lieut. R. S. Williamson, U. S. Top. Engineers. 
h. 
m. 
s. 
d. 
m. 
s. 
« Cygni. 
8 
16 
46.4 
118 
42 
20 
8 
19 
38.4 
119 
41 
40 
8 
21 
00.0 
120 
10 
30 
8 
22 
29.2 
120 
41 
00 
8 
23 
38.0 
121 
06 
40 
8 
25 
16.4 
121 
41 
20 
Arcturus. 
8 
06 
32.0 
82 
42 
30 
8 
08 
10.0 
82 
07 
30 
8 
09 
11.0 
81 
44 
40 
8 
10 
25.6 
81 
16 
50 
8 
11 
26.4 
80 
53 
50 
8 
12 
46.0 
80 
25 
40 
Polaris. 
8 
35 
33.2 
83 
29 
00 
8 
36 
36.0 
83 
30 
40 
8 
38 
00.8 
83 
31 
20 
8 
39 
06.0 
83 
32 
30 
8 
40 
24.0 
83 
33 
00 
8 
41 
40.0 
83 
33 
40 
Index error — 0'30". Barometer, 26.2 in. Thermome¬ 
ter, 58°. 
CAMP D—AUGUST 16, 1855. 
Observer —Lieut. R. S. Williamson, U. S. Top. Engineers. 
Object observed. 
Time of observ’n 
by watch. 
Observed double 
altitudes. 
h. 
ra. 
5. 
d. 
m. 
s. 
a Cygni. 
8 
27 
37.2 
125 
51 
30 
8 
28 
54.0 
126 
17 
20 
8 
30 
24.8 
126 
49 
30 
8 
31 
38.8 
127 
15 
10 
8 
32 
44.8 
127 
39 
00 
8 
33 
57.6 
128 
04 
00 
Arcturus. 
8 
15 
54.8 
75 
48 
50 
8 
18 
02.8 
75 
01 
30 
8 
18 
56.4 
74 
41 
30 
8 
20 
08.0 
74 
14 
50 
8 
21 
24.0 
73 
43 
10 
8 
23 
12.4 
73 
07 
00 
Polaris. 
8 
38 
44.4 
83 
50 
30 
8 
40 
29.2 
83 
52 
10 
8 
41 
37.6 
83 
53 
40 
8 
43 
00.8 
83 
54 
00 
8 
44 
10.0 
83 
55 
10 
8 
45 
31.2 
83 
55 
10 
8 
46 
29.2 
83 
56 
30 
8 
47 
37.6 
83 
57 
00 
8 
48 
54.0 
83 
59 
00 
8 
50 
01.6 
84 
00 
00 
Index error — O'30". Barometer, 26.0 in. Thermome¬ 
ter, 81°. 
CAMP M—SEPTEMBER 8, 1855. 
Observer —Lieut. R. S. Williamson, U. S . Top. Engineers. 
h. m. s. 
d. m. s. 
Polaris... 
7 40 57.2 
88 18 50 
7 42 02.4 
88 19 00 
7 42 57.2 
88 20 40 
7 43 47.2 
88 21 20 
7 44 39.6 
88 21 40 
7 45 53.2 
88 23 00 
7 46 36.4 
88 23 10 
7 47 18.8 
88 24 10 
7 48 13.2 
88 24 50 
7 49 40.4 
88 24 40 
7 50 40.0 
88 25 40 
7 51 16.0 
88 26 40 
7 52 09.2 
88 27 00 
7 52 56.0 
88 27 20 
7 53 37.2 
88 28 10 
Altair. 
8 35 56.0 
108 34 50 
8 36 46.4 
108 35 00 
8 37 27.2 
108 35 40 
8 38 08.4 
108 36 30 
8 39 02.4 
108 37 10 
8 40 09.2 
108 37 20 
