MAGNETIC OBSERVATIONS. 
97 
OBSERVATIONS—Continued. 
Station, Camp 68, Inscription Rock; latitude 35° 2' 40".86; longitude 7 h. 12m. 57.2s. 
Needle, B. Date, November 18, 1853. Hoar of beginning, 4A. 30m. p. m.; hour of ending, 5 h. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o ' " 
( 27 13 
Needle vertical, face of circle north, reading of azimuth circle__._7 27 00 
( 27 14 
( 27 05 
Needle vertical, face of circle south, reading of azimuth circle__ ) 27 01 
( 27 00 
Reading of azimuth circle when plane of instrument is in the magnetic meridian.... 27 05 30 
Reading of azimuth circle when plane of instrument is in the true meridian___ 40 02 24 
Approximate magnetic declination.......... 12 56 54 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
Direct. 
Def. with wt. 2 gr. 
Def. towards 
the vertical. 
( 1 ) 
Def. from 
the vertical. 
( 2 ) 
Ther. 
Fall. 
Def. with wt. 21 gr. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
( 2 ) 
Ther. 
Fah. 
East. 
West. 
o ' 
61 58 
61 53 
61 55 
61 57 
61 50 
61 50 
o ' 
87 58 
87 55 
87 60 
87 50 
87 45 
87 40 
o ' 
35 50 
35 48 
35 50 
35 48 
35 45 
35 55 
Means... 
61 53 50 
(1) 87 51 20 
(2) 35 49 20 
Cor. for index error of needle_ 
Deduced inclination_ 
Differences.. 
+ 8 48 
62 2 38 
o ' » 
52 02 00 
Half diff. or angles of deflection. 
26 01 00 
Sum of means. 
123 40 40 
Half sum — dip. 
61 50 20 
o 
43 
43 
o 
43 
o 
' 
o 
> 
94 
15 
28 
55 
94 
20 
28 
45 
94 
15 
28 
45 
94 
25 
28 
45 
94 
30 
28 
40 
94 
31 
28 
48 
o 
, 
„ 
) 
94 
22 
40 
) 
28 
46 
20 
O ' " 
65 36 20 
32 48 10 
123 09 00 
61 34 30 
o 
43 
43 
o 
43 
13 m 
