136 
MAGNETIC OBSERVATIONS. 
OBSERVATIONS—Continued. 
Station, Camp 121, Williams River; latitude 34° 16' 51''. 10; longitude 7 h. 33m. 44.83s. 
Needle, B. Date, February 13, 1854. Hour of beginning, oh. 30m. p. m. ; hour of ending, Adi. p.m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
O t " 
( 57 52 
Needle vertical, face of circle north,reading of azimuth circle.__ -1 57 52 
( 57 50 
( 57 51 
Needle vertical, face of circle south, reading of azimuth circle_____......... 1 57 51 
( 57 50 
Reading of azimuth circle when plane of instrument is in the magnetic meridian_....___ 57 51 00 
Reading of azimuth circle when plane of instrument is in the true meridian....... 71 15 19 
Approximate magnetic declination__________ 13 24 19 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) 
East._| 
O ' 
60 15 
60 15 
60 22 
60 15 
60 15 
60 12 
O ' 
86 50 
86 48 
86 45 
86 40 
86 50 
86 45 
O ' 
33 30 
33 30 
33 33 
33 25 
33 15 
33 25 
o 
63 
O ' 
94 15 
94 20 
94 08 
94 05 
94 05 
94 15 
O ' 
25 60 
25 60 
25 52 
25 58 
25 60 
25 60 
o ' 
102 15 
102 25 
102 15 
102 20 
102 18 
102 10 
O ' 
17 50 
17 48 
17 50 
17 45 
17 40 
17 50 
West.| 
Means.__ 
63 
o ' " 
60 15 40 
O ' " 
j (1) 86 46 20 ) 
\ (2) 33 26 20 ) 
o 
63 
O ' " 
j (1) 94 11 20 ) 
| (2) 25 58 20 j 
O/ll 
(1) 102 17 10 ) 
(2) 17 47 10 j 
Corr. for index er¬ 
ror of needle_ 
Deduced inclina¬ 
tion _ 
/ // 
-f 8 48 
o ' " 
53 20 00 
o ' " 
68 13 00 
o / n 
84 30 00 
o ' " 
60 24 28 
Differences_ 
Half diff. or angles 
of deflection.... 
O ' " 
26 40 00 
...... 
O ' " 
34 06 30 
o / // 
42 15 00 
Sum of means .... 
O ' " 
120 12 40 
O ' " 
120 09 40 
o f " 
120 04 20 
Half sum — dip... 
O ' " 
60 06 20 
O ' " 
60 04 50 
O 1 H 
60 02 10 
