112 
MAGNETIC OBSERVATIONS, 
OBSERVATIONS—Continued. 
Station, Camp 78, Colorado Chiguito; latitude 34° 53' 01".95; longitude 7 h. 20 m. 14.22s. 
Needle, B. Nate, December 5, 1853. Hour of beginning, 2h. 45m. p. m.; hour of ending, 3 h. 30m. p. in. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o ' " 
1 9 53 
Needle vertical, face of circle north, reading of azimuth circle. \ 9 49 
( 9 43 
( 9 41 
Needle vertical, face of circle south, reading of azimuth circle.9 44 
( 9 44 
Reading of azimuth circle when plane of instrument is in the magnetic meridian_ 9 45 40 
Reading of azimuth circle when plane of instrument is in the true meridian_ 23 26 02 
Approximate magnetic declination- 13 40 22 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
Direct. 
Def. with wt. 2 gr. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
( 2 ) 
Tiier. 
Fah. 
Def. with wt. 2J gr. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
(2) 
Ther. 
Fah. 
East. 
West. 
62 03 
62 05 
62 10 
62 10 
62 06 
62 05 
Means. 
o 11 / 
62 06 30 
Cor. for index error of needle... 
Deduced inclination. 
-f 8 48 
o / // 
62 15 18 
Differences. 
Half diff. or angles of deflection. 
Sum of means 
Half sum zn dip. 
o / 
88 20 
88 25 
88 10 
88 00 
88 12 
88 03 
35 60 
35 58 
35 60 
35 59 
35 50 
35 55 
o 
72 
72 
o ' 
94 58 
94 50 
94 65 
94 55 
94 58 
94 60 
o ' 
28 57 
28 55 
28 59 
28 50 
28 47 
28 55 
j (1) 88 11 40 
| (2) 35 57 00 
j (1) 94 57 40 ) 
| (2) 28 53 50 j 
52 14 40 
66 03 50 
26 07 20 
124 08 40 
33 01 55 
123 51 30 
62 04 20 
61 55 45 
o 
72 
72 
o 
72 
