MAGNETIC OBSERVATIONS. 
185 
OBSERVATIONS—Continued. 
Station, Camp 117, Williams’ River; latitude 34° 32' 29". 60 ; longitude 7h. 33 m. 50. 30s. 
Needle, B. Date, February 9, 1854. Hour of beginning, 2h. 30m. p. m. ; hour of ending, 2 h. 55m. 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 
t 
82 
00 
82 
00 
82 
15 
82 
10 
82 
20 
82 
05 
82 
08 
96 
06 
13 57 58 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
East. 
West. 
Means. 
Cor. for index error 
of needle .. 
Deduced inclina¬ 
tion. 
Differences- 
Half diff. or angles 
of deflection.... 
Sum of means . 
Direct. 
O r 
GO 33 
60 35 
60 35 
60 38 
60 38 
60 30 
o / n 
60 34 50 
-f 8 48 
Def. with wt. 2 gr. 
Def. towards 
the vertical. 
( 1 ) 
o l 
87 20 
87 25 
87 25 
87 15 
87 30 
87 20 
Def. from the 
vertical. 
( 2 ) 
33 50 
33 50 
33 52 
33 60 
33 45 
33 50 
(1) 87 22 30 
(2) 33 51 10 
O i n 
60 43 38 
o / 
53 31 
20 
26 45 40 
121 13 40 
60 36 50 
Ther. 
Fah. 
o 
78 
78 
o 
78 
Def. with wt. 2|gr. 
Def. towards 
the vertical. 
( 1 ) 
o / 
94 58 
94 55 
94 45 
94 55 
94 40 
94 50 
Def. from the 
vertical. 
( 2 ) 
26 30 
26 25 
26 28 
26 25 
26 35 
26 20 
(1) 94 50 30 
(2) 26 27 10 
68 23 20 
34 11 40 
121 17 40 
60 38 50 
Def. with wt. 3 gr. 
Def. towards 
the vertical. 
( 1 ) 
o ' 
102 60 
102 45 
102 58 
102 50 
102 45 
102 55 
Def. from the 
vertical. 
( 2 ) 
o ' 
18 05 
18 12 
18 15 
18 05 
18 15 
18 05 
(1) 102 52 10 
(2) 18 09 30 
84 42 40 
42 21 20 
o 
121 
01 40 
60 30 50 
Half sumr= dip 
