MAGNETIC OBSERVATIONS. 
91 
OBSERVATIONS—Continued. 
Station, Camp 63, Rio Rita ; latitude 35° 01' 09".91 ; longitude 7 h. 8m. 57. 18s. 
Needle, B. Rate, November 12, 1853. Hour of beginning, 10 a. m.; hour of ending, lO/i. 45m. a. in. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o ’ ” 
f 82 08 
Needle vertical, face of circle north, reading of azimuth circle__-__ \ 82 20 
{ 82 07 
f 81 41 
Needle vertical, face of circle south, reading of azimuth circle. I 82 05 
l 81 25 
Reading of azimuth circle when plane of instrument is in the magnetic meridian__ 81 57 40 
Reading of azimutii circle when plane of instrument is in the true meridian__ 95 43 38 
Approximate magnetic declination_.____ 13 45 58 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
Direct. 
Def. with wt. 1 gr. 
Def. towards 
the vertical. 
(IV 
Def. from the 
vertical. 
( 2 ) 
o 
, 
o 
, 
O ' 
63 
08 
75 
33 
50 35 
63 
05 
75 
45 
50 30 
63 
10 
75 
38 
50 25 
63 
15 
75 
45 
50 28 
63 
10 
75 
43 
50 30 
63 
05 
75 
40 
50 07 
o 
/ // 
o 
, n 
63 08 50 
j 
1 
(1) 75 
(2) 50 
40 40 ) 
25 50 j 
/ // 
+ 
8 48 
Tlier. 
Fall. 
Def. with wt. 1£ gr. 
Def. towards 
the vertical. 
(1) 
Def. from the 
vertical. 
(2) 
o 
, 
44 
20 
44 
03 
44 
05 
44 
12 
44 
10 
44 
15 
Tlier. 
Fall. 
East - 
o 
70 
West. 
78 
o ' 
82 08 
82 15 
82 10 
82 08 
82 16 
81 55 
Means . 
74 
j (1) 82 08 40 ) 
! j (2) 44 10 50 j 
Cor. for index error of needle_ 
Deduced inclination. 
O'" 
63 17 38 
Differences.. 
Half diff. or angles of deflection. 
Sum of means. 
25 14 50 
12 37 25 
126 06 30 
63 03 15 
37 57 50 
18 58 55 
O ' n 
126 19 30 
63 09 45 
o 
69 
75 
o 
k. 
72 
Half sum — dip 
