MAGNETIC OBSERVATIONS. 
127 
OBSERVATIONS—Continued. 
Station, Camp 105, Williams' river ; latitude 34° 59' 25''.55; longitude 7h. 31m. 49.95s. 
Needle, B. Date, January 23, 1854. Hour of beginning, 2 li. p. m.; hour of ending, 2 h. 30 m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o / // 
C 32 04 
Needle vertical, face of circle north, reading of azimuth circle....^ 32 04 
( 31 53 
C 32 05 
Needle vertical, face of circle south, reading of azimuth circle..1 32 00 
( 32 00 
Reading of azimuth circle when plane of instrument is in the magnetic meridian... 32 01 00 
Reading of azimuth circle when plane of instrument is in the true meridian.. 46 49 06 
Approximate magnetic declination.__...... 14 48 06 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY - —No. 4. 
Face of circle. 
Direct. 
Def. with 
wt. 
2 gr. 
Def. with wt. 
2£ gr. 
Def. with wt. 
3 gr 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
(2) 
Ther. 
Fah. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
(2) 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
(2) 
o 
1 
o 
/ 
o 
/ 
o 
o 
/ 
o 
, 
o 
/ 
o 
i 
( 
60 
58 
87 
05 
34 
28 
65 
94 
25 
27 
05 
102 
30 
19 
00 
East_< 
60 
55 
87 
15 
34 
22 
94 
15 
27 
08 
102 
30 
19 
02 
60 
57 
87 
08 
34 
20 
94 
20 
27 
13 
102 
35 
19 
02 
r 
60 
58 
87 
30 
34 
30 
94 
25 
27 
15 
102 
28 
19 
00 
West.) 
60 
60 
87 
15 
34 
20 
94 
25 
27 
10 
102 
20 
19 
00 
60 
55 
87 
30 
34 
28 
65 
94 
30 
27 
12 
102 
25 
19 
05 
o 
f // 
o 
1 
// 
0 
o 
/ 
ft 
o 
I 
II 
60 
57 10 
j (1) 
87 
17 
10 
l 
65 
J(i) 
94 
23 
20 
l 
(1) 
102 
28 
00 
i 
1 (2) 
34 
24 
40 
r 
1 (2) 
27 
10 
30 
i 
(2) 
19 
01 
30 
S 
Cor. for index er- 
/ n 
ror of needle_ 
+ 8 48 
Deduced inclina- 
o 
/ n 
tion. 
61 
05 58 
o 
/ 
// 
o 
/ 
// 
o 
/ 
n 
Differences. 
52 
52 
30 
67 
12 
50 
83 
26 
30 
Half diff or angles 
o 
„ 
o 
/ 
// 
o 
/ 
// 
of deflection.... 
26 
26 
15 
33 
36 
25 
41 
43 
15 
o 
// 
o 
/ 
It 
o 
// 
Sum of means.... 
121 
41 
50 
121 
33 
50 
121 
29 
30 
— 
o 
I 
// 
rj 
/ 
If 
o 
, 
// 
Half sum — dip.. 
60 
50 
55 
60 
46 
55 
60 
44 
45 
