120 
MAGNETIC OBSERVATIONS, 
OBSERVATIONS—Continued. 
Station, Camp 85, Colorado Chiquito; latitude 35° 18' 11". 74; longitude 7 h. 23 m. 31.77s. 
Needle, B. Date, December 17, 1853. Hour of beginning, 4h. 55m. p. m. ; hour of ending, 5 h. 20 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 meridian 
Reading of azimuth circle when plane of instrument is in the true meridian.... 
Approximate magnetic declination. 
o 
/ 
// 
38 
03 
38 
02 
38 
05 
38 
05 
38 
03 
38 
03 
38 
03 
30 
51 
45 
09 
13 
41 
39! 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
Direct. 
Def. with wt. 2 gr. 
Def. with wt. 2£ 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 
the vertical. 
(2) 
Def. towards 
the vertical. 
(!) 
Def. from the 
vertical. 
(2) 
East_^ 
o t 
61 47 
61 50 
61 46 
61 47 
61 46 
61 43 
O ' 
87 52 
87 59 
87 45 
87 45 
87 50 
87 45 
O ' 
35 30 
35 30 
35 28 
35 30 
35 32 
35 30 
o 
36 
o > 
94 35 
94 25 
94 40 
94 50 
94 59 
94 50 
O f 
28 15 
28 28 
28 27 
28 20 
28 28 
28 20 
o > 
102 30 
102 25 
102 25 
102 27 
102 30 
102 32 
o / 
20 30 
20 30 
20 27 
20 28 
20 18 
20 22 
West___| 
Means... 
Cor. for index er¬ 
ror of needle_ 
Deduced inclina¬ 
tion _ 
36 
O t U 
61 46 30 
O ' " 
( (1) 87 49 20 ) 
j (2) 35 30 00 j 
o 
36 
O ! U 
j (1) 94 43 10 ) 
j (2) 28 23 00 [ 
O ! /' 
j (1) 102 28 10 | 
j (2) 20 25 50 j 
/ // 
-f 8 48 
o ' " 
52 19 20 
o / !• 
66 20 10 
o 1 't 
82 02 20 
O'" 
61 55 18 
Halfdiff. or angles 
O ' " 
26 09 40 
O / // 
33 10 05 
o / a 
41 01 10 
O ilf 
123 19 20 
O /II 
123 06 10 
Oft! 
122 54 00 
o I II 
61 39 40 
Q 1 It 
61 33 05 
o / '! 
61 27 00 
