132 
MAGNETIC OBSERVATIONS, 
OBSERVATIONS—Continued. 
Station, Camp 112, Bighorn Spring ; latitude 35° 00' 51".53; longitude 7h. 34 m. 24.58s. 
Needle, II. Bate, February 4, 1854. Hour of beginning, 2h. 45m. p. m. ; hour of ending, 3h. 15m. 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 
i 
u 
52 
17 
52 
18 
52 
10 
52 
15 
52 
20 
52 
17 
52 
16 
10 
60 
34 
07 
14 17 57 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
Direct. 
Def. with wt. 2 gr. 
1 
Def. with wt. 2£ gr. 
Def. with wt. 3 gr. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
(2) 
Ther. 
Fall. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
(2) 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
(2) 
O / 
GO 55 
60 50 
60 55 
60 55 
69 50 
60 53 
O ' 
87 25 
87 25 
87 30 
87 25 
87 20 
87 18 
O i 
33 63 
33 63 
33 63 
33 45 
33 60 
33 50 
o 
73 
O ' 
94 45 
94 50 
94 45 
94 45 
94 50 
94 40 
O ' 
26 40 
26 45 
26 45 
26 40 
26 35 
26 35 
O ' 
102 58 
102 50 
102 60 
102 50 
102 55 
102 55 
O / 
18 30 
18 28 
18 25 
18 20 
18 30 
18 15 
West.. | 
Means_ 
73 
o / n 
GO 53 00 
O 1 n 
j (1) 87 23 50 ) 
j (2) 33 57 20 j 
o 
73 
O l " 
( (1) 94 45 50 ) 
j (2) 26 40 00 j 
O ' " 
J (1) 102 54 40 1 
j (2) 18 24 40 j 
Cor. for index er¬ 
ror of needle_ 
Deduced inclina- 
tion_ 
f a 
+ 8 48 
O / n 
53 26 30 
O i " 
68 05 50 
o ' " 
84 30 00 
O 1 II 
61 01 48 
Half diff. or angles 
O i ir 
26 43 15 
O ' " 
34 02 55 
o ' " 
42 15 00 
o ' " 
121 21 10 
O ' " 
121 25 50 
O ' " 
121 19 20 
o / n 
60 40 35 
60 42 55 
O ' " 
60 39 40 
1 
