140 
MAGNETIC OBSERVATIONS, 
OBSERVATIONS—Continued. 
Station, mouth of Williams’ River ; latitude 34° 17' 46". 58 ; longitude 7 h. 36 m. 00s. 
Needle, B. Dale, February 20, 1854. Hour of beginning, ll/i. 20 m.a.m.; hour of ending, 12A. 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 
' 
79 
46 
79 
47 
79 
47 
79 
75 
79 
75 
79 
52 
79 
57 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Def. with wt. 2| gr. 
Def. with wt. 3 gr. 
Face of circle. 
Direct. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
(2) 
- 
o 
, 
o 
/ 
o 
( 
60 
00 
94 
12 
25 
50 
East_ 
. \ 
60 
05 
94 
10 
25 
55 
( 
60 
03 
94 
10 
25 
50 
( 
'60 
03 
94 
03 
25 
50 
West. 
J 
60 
04 
94 
02 
25 
48 
i 
60 
00 
94 
10 
25 
55 
Means. 
Cor. for index error of needle... 
Deduced inclination.. 
Differences. 
Half diff. or angles of deflection. 
Sum of means 
Half sum = dip 
o ' " 
60 02 30 
(2) 25 51 20 
+ 8 48 
o ' " 
60 11 IS 
68 16 30 
34 08 15 
119 59 10 
59 59 35 
Ther. 
Fall. 
c 
77 
77 
Def. towards 
the vertical. 
( 1 ) 
o ' 
102 20 
102 25 
102 25 
102 25 
102 15 
102 20 
Def. from 
the vertical. 
( 2 ) 
o 
17 
17 
17 
30 
25 
30 
17 20 
17 20 
17 22 
j (1) 102 21 40 ) 
j (2) 17 24 30 j 
O'" 
84 57 10 
42 28 35 
119 46 10 
59 53 05 
Ther. 
Fah. 
o 
77 
77 
o 
77 
No observations for declination. 
