16 
ASTRONOMICAL OBSERVATIONS. 
APPENDIX A—Continued. 
CAMP S—SEPTEMBER 21, 1855—Continued. 
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. 
s. 
Altair. 
7 
43 
56.4 
108 
28 
00 
7 
45 
20.0 
108 
27 
00 
7 
46 
06.0 
108 
27 
00 
7 
48 
14.0 
108 
26 
30 
7 
48 
58.8 
108 
25 
50 
7 
49 
46.0 
108 
25 
00 
7 
50 
46.8 
108 
24 
00 
7 
51 
34.4 
108 
22 
50 
7 
52 
20.0 
108 
22 
20 
7 
53 
19.2 
108 
20 
50 
7 
54 
00.0 
108 
19 
00 
Index error — 5' 00". Barometer, 26 9 in. Thermo¬ 
meter, 54°. 
CAMP S—SEPTEMBER 22, 1855. 
Observer —Lieut. R. S. Williamson, 17. S. Top. Engineers. 
h. 
m. 
s. 
d. 
m. 
s. 
Sun’s lower limb. 
11 
46 
42.4 
91 
33 
00 
11 
47 
16.0 
91 
32 
25 
11 
48 
00.0 
91 
34 
00 
11 
48 
41.6 
91 
34 
40 
11 
49 
10.4 
91 
35 
00 
11 
49 
45.2 
91 
35 
10 
11 
50 
22.4 
91 
35 
20 
11 
50 
53.2 
91 
35 
40 
11 
51 
29.6 
91 
36 
00 
11 
52 
45.6 
91 
36 
00 
11 
53 
27.6 
91 
36 
10 
11 
54 
04.4 
91 
36 
10 
11 
54 
32.4 
91 
36 
00 
11 
55 
06.4 
91 
36 
00 
11 
55 
39.6 
91 
35 
50 
11 
56 
18.8 
91 
35 
40 
11 
57 
08.8 
91 
35 
10 
11 
58 
58.8 
91 
34 
15 
11 
59 
39.6 
91 
33 
40 
12 
00 
11.2 
91 
33 
00 
Polaris. 
7 
19 
13.6 
88 
52 
10 
7 
20 
58.4 
88 
53 
10 
7 
21 
59.2 
88 
54 
30 
7 
22 
54.4 
88 
55 
20 
7 
23 
43.6 
88 
55 
40 
7 
24 
38.0 
88 
56 
20 
7 
25 
40.8 
88 
57 
30 
7 
26 
50.4 
88 
58 
50 
7 
30 
21.2 
89 
00 
00 
7 
31 
46.4 
89 
02 
00 
7 
47 
44.0 
89 
14 
10 
7 
49 
19.6 
89 
15 
50 
7 
50 
41.6 
89 
16 
20 
7 
51 
30.0 
89 
17 
00 
7 
52 
20.0 
89 
17 
30 
7 
52 
59.6 
89 
17 
50 
7 
54 
02.0 
89 
18 
30 
7 
54 
52.8 
89 
19 
00 
7 
55 
34.4 
89 
19 
30 
7 
56 
15.2 
89 
20 
30 
Altair. 
7 
33 
42.0 
108 
25 
00 
7 
35 
08.0 
108 
26 
40 
7 
35 
48.8 
108 
27 
30 
7 
36 
34.4 
108 
27 
40 
CAMP S—SEPTEMBER 22, 
1855— 
Continued. 
Observer— Lieut. R. S. Williamson, U. S. 
Top. Engineers. 
Object observed. 
Time 
of observ’n 
Observed double 
by watch. 
altitudes. 
h. 
m. 
s. 
d. 
m. 
s. 
Altair... 
7 
37 
22.4 
108 
28 
10 
7 
38 
17.2 
108 
28 
10 
7 
39 
08.4 
108 
28 
00 
7 
39 
59.6 
108 
28 
30 
7 
40 
45.2 
108 
27 
50 
7 
41 
30.4 
108 
27 
20 
7 
42 
20.0 
108 
27 
20 
7 
43 
24.0 
108 
26 
40 
7 
44 
28.4 
108 
25 
50 
7 
45 
14.4 
108 
25 
00 
Index error — 4' 30". 
Barometer, 26.9 in. Thermo- 
meter, 540. 
CAMP 42 W- 
-SEPTEMBER 26, 1855. 
Observer —Lieut. R. S. Williamson, U. S. Top. Engineers. 
h. 
m. 
.9. 
d. 
rn. 
S. 
Polaris. 
6 
42 
38.8 
87 
23 
50 
6 
44 
08.4 
87 
24 
50 
6 
45 
34.4 
87 
26 
10 
6 
46 
20.0 
87 
26 
40 
6 
47 
37.2 
87 
27 
10 
6 
48 
38.0 
87 
28 
10 
6 
49 
40.8 
87 
28 
30 
6 
50 
22.8 
87 
29 
20 
6 
51 
13.2 
87 
29 
50 
6 
52 
03.2 
87 
31 
10 
Altair.. 
7 
18 
10.0 
109 
37 
10 
7 
18 
59.6 
109 
38 
00 
7 
20 
14.8 
109 
39 
10 
7 
21 
06.0 
109 
39 
30 
7 
22 
04.0 
109 
40 
20 
7 
22 
55.2 
109 
40 
10 
7 
24 
00.0 
109 
40 
50 
7 
24 
40.4 
109 
40 
30 
7 
25 
30.8 
109 
40 
40 
7 
26 
16.8 
109 
40 
50 
7 
27 
08.0 
109 
40 
20 
7 
27 
50.4 
109 
39 
30 
7 
28 
48.4 
109 
39 
00 
7 
29 
57.2 
109 
37 
30 
Index error — 5' 00." 
Barometer, 25.6 in. Thermo- 
meter, 46°.5. 
CAMP 44 W— 
SEPTEMBER 28, 1855. 
Observer —Lieut. R. S. Williamson, U. S. Top. Engineers. 
h. 
m. 
s. 
d. 
m. 
s. 
Polaris... 
6 
44 
39.6 
87 
02 
00 
6 
45 
56.0 
87 
03 
00 
6 
47 
01.2 
87 
02 
20 
6 
48 
49.6 
87 
03 
50 
6 
50 
02.4 
87 
05 
10 
6 
51 
18.8 
87 
06 
00 
6 
51 
56.0 
87 
07 
00 
6 
52 
35.2 
87 
07 
00 
6 
53 
18.0 
87 
07 
30 
6 
54 
16.0 
87 
08 
00 
