MAGNETIC OBSERVATIONS. 
117 
OBSERVATIONS—Continued. 
Station, Camp 83, Colorado Chiquito ; latitude 35° 05' 18". 26 longitude; 7A. 22 m. 12. 09s. 
Needle , B. Date, December 15, 1853. Hour of beginning, 11 h. 30 m. a. in.; hour of ending, 12 h. 30 m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
Needle vertical, face of circle north, reading of azimuth circle... 
Needle vertical, face of circle south, reading of azimuth circle.. 
Reading of azimuth.circle when plane of instrument is in the magnetic meridia® 
Reading of azimuth circle when plane of instrument is in the true meridian. 
Approximate magnetic declination..... 
0 
' 
22 
23 
22 
18 
22 
17 
22 
30 
22 
36 
22 
40 
22 
27 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
Direct. 
Def. with wt. 2 gr. 
Def. with wt. gr. 
Def. with wt. 3 gr. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
(2) 
Ther. 
Fah. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
(2) 
Def. from 
the vertical. 
(2) 
Def. towards 
the vertical. 
(1) 
o 
, 
O 1 
O • 
o 
o • 
o / 
O ' 
O / 
( 
61 
38 
87 55 
35 18 
43 
94 40 
28 05 
20 00 
102 25 
East. J 
61 
42 
87 50 
35 20 
04 35 
28 10 
20 05 
102 30 
61 
40 
87 45 
35 22 
94 40 
28 12 
20 05 
102 32 
( 
61 
33 
87 40 
35 15 
94 45 
28 03 
20 00 
102 25 
West_} 
61 
30 
87 40 
35 20 
04 30 
28 00 
20 00 
102 15 
61 
29 
87 50 
35 25 
41 
94 40 
28 00 
20 02 
102 25 
O / 
// 
o 
f 
ll 
o 
o 
/ 
tl 
o 
/ // 
Means. 
61 35 
20 
( (1) 87 
46 
40 ) 
42 
j (1) 94 
38 
20 j 
j (1) 102 
25 20 | 
i (2) 35 
20 
00 J 
1 (2) 28 
05 
00 f 
1 (2) 20 
02 00 j 
Corr. for index er- 
1 
// 
ror of needle_ 
+ 8 
48 
Deduced inclina- 
o I 
// 
tion_ 
61 44 08 
O' 
r 
„ 
o 
/ 
o 
// 
Differences . 
52 
26 
40 
66 
33 
20 
82 
23 
20 
Half diff. or angles 
* o 
/ 
II 
o 
/ 
// 
o 
/ 
// 
of deflection_ 
26 
13 
20 
33 
16 
40 
41 
11 
40 
o 
, 
II 
o 
/ 
// 
0 
/ 
1/ 
Sum of means.... 
123 
06 
40 
122 
43 
20 
122 
27 
20 
o 
I 
II 
o 
/ 
// 
o 
, 
n 
Half sum — dip... 
61 
33 
20 
61 
21 
40 
61 
13 
40 
Night cloudy ; no observations for declination. 
