MAGNETIC OBSERVATIONS. 
121 
OBSERVATIONS—Continued. 
Station, Camp 86, Colorado Chiquito; latitude 35° 20' 54".12 ; longitude 7h. 23m. 45.30s. 
Needle, B. Date, December 18, 1853. Hour of beginning, 3 h. 20m. p. m. ; hour of ending, 3 h. 50m.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 
, 
39 
12 
39 
12 
39 
12 
39 
18 
39 
11 
39 
15 
39 
13 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
East. 
West. 
Means. 
Cor. for index er¬ 
ror of needle_ 
Deduced inclina¬ 
tion. 
Differences.. 
Halfdiff. or angles 
of deflection.... 
Sum of means . 
Half sum == dip. 
Def. with wt. 2 gr. 
Direct. 
o ' 
61 58 
61 52 
61 60 
61 59 
61 50 
61 48 
Def. towards 
the vertical. 
( 1 ) 
o ' " 
61 54 30 
+ 8 48 
o ' " 
62 03 18 
o ' 
87 43 
87 45 
87 45 
87 38 
87 30 
87 40 
Def. from the 
vertical. 
( 2 ) 
35 45 
35 50 
35 52 
35 50 
35 53 
35 45 
j (1) 87 40 10 ) 
j (2) 35 49 10 j 
51 51 00 
25 55 30 
123 29 20 
61 44 40 
Ther. 
Fah. 
o 
40 
40 
40 
Def. with wt. 2\ gr. 
Def. towards 
the vertical. 
(1) 
o ' 
94 35 
94 20 
94 30 
04 28 
94 32 
94 30 
Def. from the 
vertical. 
( 2 ) 
o ' 
28 45 
28 48 
28 45 
28 40 
28 38 
28 45 
j (1) 94 29 10 
■j (2) 28 43 30 
65 45 40 
32 52 50 
123 12 40 
61 36 20 
Def. with wt. 3 gr. 
Def. towards 
the vertical. 
( 1 ) 
o ' 
102 33 
102 28 
102 27 
102 28 
102 18 
102 20 
Def. from 
the vertical. 
( 2 ) 
o ' 
20 48 
20 55 
20 58 
20 48 
20 38 
20 35 
(1) 102 25 40 ) 
(2) 20 47 00 j 
81 38 40 
40 49 20 
123 12 40 
61 36 20 
16 m 
