MAGNETIC OBSERVATIONS, 
139 
OBSERVATIONS—Continued. 
Station, Camp 123, Williams’ River ; latitude 34° 13' 44". 10; longitude 7 h. 34 m. 36.77s. 
Needle, B. Date, February 16, 1854. Hour of beginning, 3 h. 40 in. p. m.; hour of ending, 4A 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.... 
0 
U 
93 
34 
93 
34 
93 
34 
93 
31 
93 
40 
93 
31 
93 
34 00 
Approximate magnetic declination 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
Direct. 
Def. with wt. 24 gr. 
Def. towards 
the vertical. 
( 1 ) 
Def. from the 
vertical. 
( 2 ) 
Tlier. 
Fah. 
Def. with wt. 3 gr. 
Def. towards 
the vertical. 
( 1 ) 
Def. from the 
vertical. 
( 2 ) 
Ther. 
Fah. 
East. 
West. 
o ' 
60 00 
60 02 
60 00 
60 02 
60 02 
60 00 
o ' 
94 05 
94 18 
94 05 
94 18 
94 10 
94 12 
o ' 
25 57 
25 55 
25 50 
25 58 
25 60 
25 60 
Means. 
60 01 00 
(1) 94 11 20 
(2) 25 56 40 
Corr. for index error of needle.. 
+ 8 48 
Deduced inclination 
60 09 48 
Differences. 
68 14 40 
Half diff. or angles of deflection. 
34 07 20 
Sum of means , 
Half sum = dip 
120 08 00 
60 04 00 
o 
72 
72 
o 
72 
o ' 
102 20 
102 35 
102 30 
102 20 
102 20 
102 15 
o 
17 30 
17 40 
17 30 
17 25 
17 35 
17 30 
(1) 102 23 20 
(2) 17 31 40 
84 51 40 
o ' " 
42 25 50 
o ' " 
119 55 00 
59 57 30 
o 
72 
72 
72 
Night cloudy. No observations for declination. 
