14 
ASTRONOMICAL OBSERVATIONS. 
APPENDIX A—Continued. 
CAMP M—SEPTEMBER 8, 1855—Continued. 
Observer —Lieut. R. S. Williamson, U. S. Top. Engineers. 
Object observed. 
Time of observ’n 
by watch. 
Observed double 
altitudes. 
Altair. 
8 
41 
55.6 
108 
37 
00 
8 
42 
23.2 
108 
38 
10 
8 
43 
26.0 
108 
38 
00 
8 
44 
14.0 
108 
37 
50 
8 
44 
59.6 
108 
37 
30 
8 
46 
24.0 
108 
36 
50 
8 
47 
23.2 
108 
36 
00 
8 
48 
40.0 
108 
34 
30 
Index error — 4' 50". Barometer, 24.7 in. Thermo¬ 
meter, 43°.5. 
CAMP M—SEPTEMBER 9, 1855. 
Observer —Lieut. R. S. Williamson, U. S. Top. Engineers. 
h. 
m. 
S. 
d. 
m. 
s. 
Sun’s lower limb. 
11 
54 
00.0 
101 
43 
50 
11 
54 
35.2 
101 
44 
10 
11 
55 
10.8 
101 
44 
20 
11 
55 
54.8 
101 
44 
40 
11 
56 
30.0 
101 
44 
50 
11 
57 
04.0 
101 
45 
00 
11 
57 
32.8 
101 
45 
00 
11 
'58 
08.0 
101 
44 
50 
11 
59 
35.2 
101 
44 
50 
12 
00 
07.2 
101 
44 
50 
12 
00 
53.2 
101 
44 
40 
12 
01 
27.2 
101 
44 
30 
12 
01 
58.4 
101 
44 
20 
12 
02 
29.6 
101 
44 
10 
12 
02 
59.2 
101 
43 
40 
Index error — 5' 20". Barometer, 24.7 in. Thermo¬ 
meter, 57°.5. 
CAMP 40—SEPTEMBER 11, 1855. 
Observer —Lieut. R. S. Williamson, U. S. Top. Engineers. 
h. 
m. 
s. 
d. 
m. 
5. 
Sun’s lower limb. 
11 
53 
10.0 
100 
09 
40 
11 
53 
49.6 
100 
10 
00 
11 
54 
27.2 
100 
10 
10 
11 
54 
57.2 
100 
10 
40 
11 
55 
25.2 
100 
10 
50 
11 
55 
51.6 
100 
11 
00 
11 
56 
19.6 
100 
11 
00 
11 
,56 
46.4 
100 
11 
00 
11 
57 
18.0 
100 
11 
00 
11 
57 
45.2 
100 
10 
50 
11 
58 
14.0 
100 
10 
40 
11 
58 
41.2 
100 
10 
30 
11 
59 
06.4 
100 
10 
30 
11 
59 
30.0 
100 
10 
20 
11 
59 
54.8 
100 
10 
20 
12 
00 
23.2 
100 
10 
10 
12 
00 
46.8 
100 
10 
00 
12 
01 
10.8 
100 
09 
40 
Polaris. 
8 
06 
54.4 
88 
51 
30 
8 
08 
32.0 
88 
52 
00 
8 
09 
44.4 
88 
52 
40 
CAMP 40—SEPTEMBER 11, 1855—Continued. 
Observer —Lieut. R. S. Williamson, U. S. Top. Engineers. 
Object observed. 
Time of obseiv’n 
by watch. 
Observed double 
altitudes. 
h. 
m. 
s. 
d. 
771. 
s. 
Polaris. 
8 
10 
36.4 
88 
53 
40 
8 
11 
18.0 
88 
54 
10 
8 
12 
20.8 
88 
55 
10 
8 
13 
07.2 
88 
55 
10 
8 
13 
48.8 
88 
56 
10 
8 
14 
32.0 
88 
56 
20 
8 
15 
16.8 
88 
57 
10 
Altair. 
8 
17 
00.8 
108 
31 
20 
8 
18 
03.2 
108 
33 
00 
8 
18 
49.6 
108 
33 
10 
8 
19 
40.4 
108 
33 
30 
8 
20 
21.6 
108 
33 
40 
8 
20 
54.6 
108 
33 
40 
8 
22 
12.0 
108 
34 
00 
8 
22 
52.0 
108 
34 
00 
8 
23 
40.0 
108 
34 
10 
8 
24 
26.0 
108 
33 
50 
8 
25 
19.2 
108 
33 
30 
8 
26 
42.4 
108 
32 
00 
8 
29 
01.6 
108 
30 
00 
Index error—5'38". Barometer, 25.6 in. Thermome¬ 
ter, 40°.5. 
CAMP 40—SEPTEMBER 12, 1855. 
Observer —Lieut. R. S. AVilliamson, U. S. Top. Engineers. 
a Coronal Borealis. 
h. 
m. 
$. 
d. 
771. 
s. 
7 
40 
46.0 
87 
31 
00 
7 
42 
19.2 
86 
56 
10 
7 
43 
53.2 
86 
22 
50 
7 
45 
26.0 
85 
49 
20 
7 
46 
19.6 
85 
31 
10 
7 
47 
10.4 
85 
10 
50 
Polaris. 
8 
33 
53.2 
88 
50 
40 
8 
35 
10.0 
88 
51 
00 
8 
36 
09.2 
88 
52 
20 
8 
36 
54.4 
88 
52 
30 
8 
37 
40.8 
88 
53 
10 
8 
38 
46.0 
88 
54 
10 
8 
39 
29.2 
88 
54 
40 
8 
40 
37.2 
88 
55 
50 
8 
41 
23.6 
88 
56 
10 
8 
42 
12.8 
88 
56 
50 
Altair. 
8 
12 
45.6 
108 
53 
10 
8 
14 
04.0 
108 
54 
40 
8 
15 
10.8 
108 
55 
50 
8 
16 
01.6 
108 
56 
00 
8 
16 
46.0 
108 
55 
40 
8 
18 
24.8 
108 
56 
00 
8 
19 
12.0 
108 
56 
20 
8 
20 
28.0 
108 
55 
40 
8 
21 
42.4 
108 
55 
40 
8 
22 
41.6 
108 
55 
30 
8 
23 
43.2 
108 
54 
30 
8 
25 
30.0 
108 
53 
10 
Index error—5'40". Barometer,24.1 in. Thermometer, 
440.5. 
