MAGNETIC OBSERVATIONS. 
99 
OBSERVATIONS—Continued. 
Station, Camp 70, Zuni river. Date, November 21, 1853. 
Face of circle. 
Whether observations are 
direct or by reflection. 
Time of observa¬ 
tion by chron¬ 
ometer No. 10. 
Reading of 
azimuth cir¬ 
cle. 
Computed azi¬ 
muth of Po¬ 
laris. 
Reading of azimuth 
circle when plane 
of instrument is in 
the true meridian. 
West.- -j 
l 
f 
East.... I 
l 
Direct_ 
h. m. s. 
1 07 29 
1 10 28.5 
o / 
10 51 
10 52 
o / H 
1 09 45 
o / II 
12 01 15 
Direct_ 
Reflection___ 
Reflection__ 
Reflection_ 
Reflection_ 
Direct_ 
1 12 45.3 
1 14 22. 2 
11 16 
11 19 
1 08 03 
12 25 33 
Direct_ 
Reading of azimuth circle when plane of instrument is in the true meridian, by mean of four observations 
12 13 24 
Error of chronometer -)- 2 h. 41 m. 20s. 
Station, Camp 70, Zuni. Latitude 35° 5' 41". 88 ; longitude 7 h. 14 m. 35.56s. 
Needle, B. Date, November 22, 1853. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o ' " 
1 28 38 
Needle vertical, face of circle north, reading of azimuth circle. J 28 28 
( 28 23 
( 28 30 
Needle vertical, face of circle south, reading of azimuth circle___ I 28 40 
( 28 38 
Reading of azimuth circle when plane of instrument is in the magnetic meridian... 28 32 50 
Reading of azimuth circle when plane of instrument is in the true meridian....... 
OBSERVATIONS FOR VARIATIONS OF BAROMETER, THERMOMETER, AND MAGNETIC INCLINATION. 
Face of Circle East. 
Date. 
Hours and 
minutes. 
Reading of 
dip. needle. 
No. 790, cis¬ 
tern barom¬ 
eter. 
Tlier. 
Fab. 
Ther. 
Att. 
Remarks. 
1853. 
h. 
m. 
o 
, 
o 
o 
Nov. 22 
2 
15 p. m. 
61 
55 
23. 988 
74. 5 
Clear sky 
no wind. 
2 
30 
61 
56 
23. 983 
78. 5 
Do. 
2 
45 
61 
56 
23. 982 
78. 0 
Do. 
3 
00 
61 
54 
23. 973 
71.5 
Do. 
3-niile westerly breeze. 
3 
15 
61 
58 
23. 966 
70. 0 
Do. 
5-mile 
do. 
3 
30 
62 
00 
23. 965 
69. 0 
_ 
Do. 
5-mile 
do. 
3 
45 
61 
58 
23. 965 
68 . 0 
Do. 
4-mile 
do. 
4 
00 
61 
55 
23. 963 
67. 0 
Do. 
3-mile 
do. 
4 
15 
62 
00 
23. 958 
66 . 0 
Do. 
2 -mile 
do. 
4 
30 
62 
00 
23. 956 
65. 0 
Do. 
2 -mile 
do. 
4 
45 
62 
02 
23. 948 
64. 0 
Do. 
2 -mile 
do. 
5 
00 
61 
58 
23. 940 
59. 0 
Do. 
no wind. 
5 
15 
62 
05 
23. 934 
57. 0 
Do. 
do. 
