4 
ASTRONOMICAL OBSERVATIONS. 
APPENDIX A—Continued. 
FORT READING—JULY 23 
Observer — Lieut. R. S. Williamson, U. S. 
1855. 
Top. Engineers. 
CAMP 13—JULY 29, 1855—Continued. 
Observer — Lieut. R. S. Williamson, 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. to. 
s. 
d. 
111 . s. 
10 
04 
23.5 
114 
00 
00 
8 52 
56.0 
124 
17 00 
10 
04 
54.0 
114 
10 
00 
8 55 
21.0 
124 
17 50 
10 
05 
25.0 
114 
20 
00 
8 57 
18.0 
124 
17 20 
10 
05 
56.0 
114 
30 
00 
8 58 
48.5 
124 
17 10 
10 
06 
25.0 
114 
40 
00 
9 00 
06.5 
124 
16 30 
10 
06 
56.0 
114 
50 
00 
9 01 
48.0 
124 
14 10 
10 
07 
26.0 
115 
0O 
00 
9 03 
10.0 
124 
12 20 
10 
07 
56.5 
115 
10 
00 
9 05 
25.5 
124 
08 20 
10 
08 
27.0 
115 
20 
00 
10 
08 
56.5 
115 
30 
00 
Polaris. 
9 23 
28.0 
80 
12 40 
10 
09 
27.0 
115 
40 
00 
9 26 
03.5 
80 
15 10 
10 
09 
57.5 
115 
50 
00 
9 27 
42.0 
80 
16 00 
10 
10 
30.0 
116 
00 
00 
9 29 
49.0 
80 
17 20 
9 31 
02.5 
80 
18 40 
Sun’s lower limb. 
1 
59 
18.0 
116 
00 
00 
9 32 
45.0 
80 
20 00 
1 
59 
48.0 
115 
50 
00 
2 
00 
17.5 
115 
40 
00 
2 
00 
49.5 
115 
30 
00 
Index error —P 50". 
Barometer, 26.0 
in. Thermome- 
2 
01 
20.5 
115 
20 
00 
ter, 570. 
2 
01 
50.5 
115 
10 
00 
2 
02 
21.0 
115 
00 
00 
CAMP 15—JULY 30, 1855. 
2 
02 
53.5 
114 
50 
00 
2 
03 
22.5 
114 
40 
00 
Observer — Lieut. R. S. Williamson, U. S. 
Top. Engineers. 
2 
03 
52.5 
114 
30 
00 
2 
04 
24.0 
114 
20 
00 
2 
04 
53.0 
114 
10 
00 
h. to. 
s. 
d. 
m. s . 
2 
05 
24.0 
114 
00 
00 
a Cygni.. 
8 41 
18.0 
107 
53 00 
8 43 
20.0 
108 
37 30 
a Serpentarii. 
9 
14 
57.0 
124 
19 
40 
8 45 
02.5 
109 
12 40 
9 
16 
46.0 
124 
21 
10 
8 47 
16.0 
110 
00 10 
9 
19 
46.5 
124 
24 
30 
8 48 
52.0 
110 
33 10 
9 
21 
37.0 
124 
23 
40 
8 50 
27.5 
111 
07 00 
9 
22 
50.0 
124 
23 
20 
9 
24 
36.5 
124 
23 
10 
Arcturus... 
9 20 
56.0 
74 
53 20 
9 
26 
36.0 
124 
23 
00 
9 22 
20.0 
74 
21 20 
9 
28 
33.0 
124 
19 
40 
9 23 
29.0 
73 
55 20 
9 
29 
57.0 
124 
18 
10 
9 24 
32.0 
73 
31 10 
9 27 
20.0 
72 
26 30 
Polaris . 
9 
42 
05.5 
80 
00 
50 
9 
43 
54.5 
80 
02 
10 
Polaris . 
9 09 
37.0 
80 
11 00 
9 
45 
44.0 
80 
03 
50 
9 11 
12.0 
80 
12 20 
9 
47 
56.5 
80 
04 
10 
9 12 
11.0 
80 
12 50 
9 
49 
32.0 
80 
05 
50 
9 13 
44.5 
80 
14 10 
9 15 
02.0 
80 
15 10 
9 16 
17.5 
80 
16 00 
Index error — 2' 15" 
. Barometer, 29.6 in. 
Ther- 
mometer, 83° 
Index error — P 50". 
Barometer 
,24.9 in. Thermome- 
CAMP 13—JULY 29, 1855. 
ter, 57°. 
Observer — Lieut. R. S. Williamson, U. S. Top. Engineers. 
CAMP 17- 
-AUGUST 1, 1855. 
Observer — Lieut. II. 8. Williamson, U. tS. 
Top . Engineers . 
h. 
m. 
s. 
d. 
m. 
S. 
a Cygni . 
8 
29 
20.0 
102 
02 
40 
8 
31 
58.5 
102 
57 
20 
h. to. 
s. 
d. 
m. s. 
8 
33 
11.0 
103 
22 
30 
a Cygni . 
8 14 
24.0 
101 
34 00 
8 
34 
18.5 
103 
46 
30 
8 16 
19.0 
102 
15 20 
8 
35 
21.5 
104 
07 
20 
8 17 
46.5 
102 
34 50 
8 
36 
25.0 
104 
30 
20 
8 19 
53.0 
103 
28 50 
8 21 
41.5 
104 
05 40 
Arelurus ... 
8 
38 
41 .5 
92 
32 
30 
8 23 
14.0 
104 
38 30 
8 
40 
25.0 
91 
53 
30 
8 
41 
43.5 
91 
24 
30 
Arcturus . 
8 26 
25.0 
92 
07 40 
8 
43 
14.0 
90 
51 
50 
8 28 
12.5 
91 
29 20 
8 
44 
25.5 
90 
24 
10 
8 30 
26.0 
90 
39 10 
8 
45 
45.0 
89 
55 
50 
8 32 
39.0 
89 
49 50 
8 34 
28.0 
89 
11 00 
a Serpentarii. 
8 
50 
51.5 
124 
15 
10 
8 35 
38.0 
88 
44 00 
