146 
MAGNETIC OBSERVATIONS, 
OBSERVATIONS—Continued. 
Station, Camp 135, Bio Colorado ; latitude 34° 52' 15".60; longitude 7h. 38 m. 0G.88£. 
Xeedle, B. Date, March 1, 1854. Hour of beginning, 4 h. 40 m. p. m.; hour of ending, bh. bbm. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o ' 
( 83 25 
Needle vertical, face of circle north, reading of azimuth circle.4 83 30 
( 83 20 
f 83 25 
Needle vertical, face of circle south, reading of azimuth circle.. 4 83 15 
( 83 22 
Reading of azimuth circle when plane of instrument is in the magnetic meridian.. 83 22 50 
Reading of azimuth circle when plane of instrument is in the true meridian. 97 18 43 
Approximate magnetic declination .._.... 13 55 53 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
Direct. 
East. 
West. 
o 
, 
60 
45 
60 
50 
60 
50 
60 
50 
60 
47 
60 
48 
O ' >• 
Means. 
C0 48 20 
Cor. for index error of needle_ + 8 48 
o ' >' 
Deduced inclination. 60 57 08 
Differences..-. 
_ 
Half cliff, or angles of deflection. 1 . 
)- 
Sum of means__I. 
Half sum =: dip____ 
Def. with wt. 2.1 gr. 
Def. towards 
the vertical. 
( 1 ) 
Def. from 
the vertical. 
( 2 ) 
o ' 
94 35 
94 35 
94 25 
94 40 
94 30 
94 30 
o ' 
26 40 
26 50 
26 45 
26 50 
26 47 
26 50 
j (1) 94 32 30 ) 
] (2) 26 47 00 j 
o ' " 
67 45 30 
33 52 45 
121 19 30 
60 39 45 
Ther. 
Fall. 
o 
61 
57 
o 
59 
Def. with wt. 3 gr. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
( 2 ) 
o 
, 
o 
102 
32 
18 
20 
102 
40 
18 
25 
102 
30 
18 
22 
102 
32 
18 
28 
102 
40 
18 
?2 
102 
37 
18 
37 
j (1) 102 35 10 | 
| (2) 18 27 20 j 
84 07 50 
42 03 55 
121 02 30 
o ' " 
60 31 15 
Ther. 
Fah. 
o 
61 
57 
