ASTRONOMICAL OBSERVATIONS. 
17 
APPENDIX A—Continued. 
CAMP 44 W—SEPTEMBER 23, 1835—Continued. 
Observer —Lieut. R. S Williamson, U. S. Top Engineers 
Object observed. 
Altair. 
Time of observ’n 
by watch. 
Observed double 
altitudes. 
h. 
m. 
s. 
cl. 
in. 
s. 
7 
13 
01.G 
110 
07 
30 
7 
13 
40.1 
110 
09 
00 
7 
14 
40.4 
110 
08 
50 
7 
15 
10.0 
no 
08 
50 
7 
1G 
00.G 
no 
08 
30 
7 
1G 
41.9 
110 
09 
20 
7 
17 
50.7 
110 
09 
30 
7 
18 
31.5 
no 
09 
20 
7 
19 
31.2 
no 
09 
10 
7 
20 
31.1 
no 
08 
40 
7 
21 
11.2 
no 
08 
20 
7 
22 
00.8 
no 
07 
50 
7 
22 
41.3 
no 
07 
30 
Index error, — 4' 40." Barometer, 25.4 in. Thermome¬ 
ter, 490. 
CAMP 45 W—SEPTEMBER 30, 1855. 
Observer —Lieut. R. S. Williamson, U. S. Top Engineers. 
h . 
III. 
s. 
d. 
mi. 
S. 
Polaris. 
7 
26 
16.0 
88 
12 
40 
7 
27 
26.0 
88 
13 
20 
7 
28 
11.6 
88 
14 
00 
7 
28 
55.2 
88 
14 
20 
7 
29 
42.8 
88 
14 
00 
7 
30 
38.0 
88 
15 
10 
7 
32 
04.4 
88 
16 
00 i 
7 
33 
31.2 
88 
17 
30 
7 
34 
18.8 
88 
17 
40 
7 
35 
12.0 
88 
18 
50 
7 
36 
13.2 
88 
19 
50 
Altair. 
7 
07 
48.0 
109 
33 
30 
7 
08 
21.4 
109 
34 
10 
7 
09 
03.2 
109 
34 
50 
7 
09 
48.4 
109 
35 
20 
7 
10 
24.8 
109 
35 
40 
7 
11 
1 1.6 
109 
35 
30 ; 
7 
11 
49.2 
109 
35 
30 ; 
7 
12 
25.6 
109 
35 
30 I 
7 
13 
02.0 
109 
35 
40 
7 
13 
50.0 
109 
35 
40 
7 
14 
33.6 
109 
35 
40 
7 
15 
30.0 
109 
35 
10 
7 
16 
06.8 
109 
34 
30 
7 
16 
40.8 
109 
33 
40 
Index error,— 5' 30". 
Barometer, 28.9 
in. Thermome- 
ter, 5G°. 
CAMP 48 W—OCTOBER 2, 1855. 
Observer —Lieut. R. S. Williamson, U. S. Top. E> 
gineers. 
h. 
Ml. 
s. 
d. 
m. 
s. 
Sun’s upper limb. 
9 
19 
31.2 
62 
40 
00 
9 
20 
07.6 
62 
50 
00 
9 
20 
50.8 
63 
00 
00 j 
9 
21 
26.0 
63 
10 
00 
9 
22 
02.0 
63 
20 
00 
9 
22 
42.0 
63 
30 
oo ! 
[ 
CAMP 48 W—OCTOBER 2 
1855- 
-Continued. 
Observer — Lieut. R. S. Williamson, U S. 
Top. En 
gineers. 
Object observed. 
Time of ohserv’n 
Observed do 
ublo 
by watch. 
altitudes. 
h. 
mi. 
s. 
d . 
m. 
s. 
Sun’s upper limb. 
9 
23 
20.8 
63 
40 
00 
9 
23 
59.6 
63 
50 
00 
9 
24 
37.6 
64 
00 
00 
9 
25 
16.8 
64 
10 
00 
9 
25 
56.0 
64 
20 
00 
9 
26 
35.2 
64 
30 
00 
9 
27 
14.4 
64 
40 
00 
Sun’s upper limb. 
o 
29 
12.4 
63 
20 
00 
2 
29 
50.8 
63 
10 
CO 
2 
30 
28.8 
( 3 
00 
00 
2 
31 
05.2 
62 
50 
00 
2 
31 
44.0 
62 
40 
00 
Polaris. 
7 
29 
04.4 
88 
40 
23 
7 
30 
08.0 
88 
41 
00 
7 
30 
51.2 
88 
41 
30 
7 
31 
38.0 
88 
42 
00 
7 
32 
21.2 
88 
42 
40 
7 
33 
02.0 
88 
43 
20 
7 
33 
42.8 
88 
43 
40 
7 
34 
30.0 
88 
44 
10 
7 
35 
21.2 
88 
44 
50 
7 
36 
12.4 
88 
45 
20 
Altair.„. 
7 
01 
51.6 
109 
14 
40 
I 
7 
02 
58.4 
109 
14 
50 
7 
03 
40.8 
109 
15 
00 
7 
04 
32.8 
109 
15 
00 
7 
05 
13.6 
109 
15 
00 
7 
05 
56.8 
109 
14 
50 
7 
06 
32.4 
109 
14 
50 
7 
07 
14.8 
109 
14 
30 
7 
08 
07.2 
109 
14 
10 
7 
08 
43.2 
109 
13 
30 
7 
09 
26.4 
109 
13 
00 
7 
10 
23.6 
109 
12 
50 
7 
1 l 
34.8 
109 
11 
30 
7 
12 
28.4 
109 
10 
30 
Index error, — 5' 0". 
Barometer, 29.1 in. Thermome- 
\ ter, 59°.5- 
CAMP 48 W—OC 
TOBER 3, 
1855. 
Observer — Lieut. R. S. Williamson, U. S. 
Top. En 
gineers. 
h. 
m. 
s. 
d . 
m . 
S . 
Polaris. 
7 
10 
44.8 
88 
29 
40 
7 
12 
08.0 
88 
30 
10 
7 
13 
34.4 
88 
32 
00 
7 
14 
37.2 
88 
32 
30 
7 
16 
(5.2 
88 
33 
10 
7 
17 
05.2 
88 
34 
30 
7 
18 
00.0 
88 
35 
00 
7 
18 
53.6 
88 
35 
40 
7 
19 
52.0 
88 
36 
30 
7 
20 
48.0 
88 
36 
30 
7 
2! 
32.8 
88 
37 
30 
7 
22 
la.2 
88 
38 
00 
Altair . 
6 
56 
44.0 
109 
13 
10 
6 
57 
36.0 
109 
14 
00 
6 
58 
21.2 
109 
14 
10 
6 
59 
06.8 
109 
14 
20 
6 
59 
50.8 
109 
14 
50 
AA 
