114 
MAGNETIC OBSERVATIONS, 
OBSERVATIONS—Continued. 
Station, Camp 80, Colorado Chiquito ; latitude 34° 59' 39". 19; longitude 7h. 21 m. 40. 60s. 
Needle, J3. Date, December 7, 1853. Hour of beginning, 3h. 30 m. p. m. ; hour of ending, 4 h. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
O ' " 
( 24 16 
Needle vertical, face of circle north, reading of azimuth circle.. -j 24 17 
( 24 20 
( 24 21 
Needle vertical, face of circle south, reading of azimuth circle.... J 24 15 
( 24 35 
Reading of azimuth circle when plane of instrument is in the magnetic meridian___ 24 20 40 
Reading of azimuth circle when plane of instrument is in the true meridian... 38 00 19 
Approximate magnetic declination _---.-..-- 13 39 39 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
Direct. 
Def. with wt. 2 gr. 
Def. towards j Def. from 
the vertical. : the vertical. 
(1) (2) 
Ther. 
Fall. 
Def. with wt. 2\ gr. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
( 2 ) 
Ther. 
Fail. 
East. 
West. 
Means.. 
Cor. for index error of needle... 
Deduced inclination. 
Differences . 
Half diff. or angles of deflection 
Sura of means . 
61 40 
61 48 
61 50 
61 47 
61 40 
61 45 
61 45 00 
+ 8 48 
61 53 48 
o / 
87 57 
87 60 
87 58 
87 50 
87 45 
87 40 
o ' 
35 30 
35 30 
35 32 
35 30 
35 30 
35 33 
o 
58 
60 
94 45 
94 55 
94 45 
94 48 
94 40 
94 50 
28 20 
28 30 
28 25 
28 15 
28 20 
28 25 
j (1) 87 51 40 ) 
j (2) 35 30 50 j 
o 
59 
j (1} 94 47 10 ) 
j (2) 28 22 30 j 
52 20 50 
26 10 25 
123 22 30 
61 41 15 
O I " 
66 24 40 
33 12 20 
123 09 40 
61 34 50 
o 
58 
60 
o 
59 
Half sum - dip 
