106 
MAGNETIC OBSERVATIONS. 
OBSERVATIONS—Continued. 
Station, Camp 74, Navajo Spring ; latitude 35° 06' 19".44; longitude 7A. 17 m. 20. 65 s.^ 
Needle, B. Nate, November 30, 1853. Hour of beginning, 2 h. p. m. ; hour of ending, 2 h. 30 m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o ' n 
( 60 51 
Needle vertical, face of circle north, reading of azimuth circle....... ) 60 44 
( 60 45 
i 60 50 
Needle vertical, face of circle south, reading of azimuth circle.. J 60 34 
( 60 30 
Reading of azimuth circle when plane of instrument is in the magnetic meridian... 60 42 20 
Reading of azimuth circle when plane of instrument is in the true meridian..... 74 05 39 
Approximate magnetic declination______ 13 23 19 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
East. 
West. 
Means.. 
Cor. for index error of needle... 8 48 
Direct. 
Differences. 
Half diff. or angles of deflection. 
Sum of means . 
Def. with wt. 2 gr. 
61 45 
61 42 
61 50 
61 50 
61 55 
61 53 
Def. towards 
the vertical. 
( 1 ) 
o III 
61 49 10 
Deduced inclination.— I 61 57 58 
87 40 
87 50 
87 40 
87 
67 
87 
45 
55 
Def. from 
the vertical. 
( 2 ) 
o ' 
35 45 
35 40 
35 45 
35 50 
35 60 
35 55 
j (1) 87 47 30 ) 
j (2) 35 49 10 j 
Ther. 
Fah. 
Def. with wt. 2J gr. 
Def. towards 
the vertical. 
( 1 ) 
62 
64 
63 
o'" 
51 58 20 
25 59 10 
123 36 40 
61 48 20 
o ' 
94 40 
94 35 
94 38 
94 45 
'94 40 
94 35 
Def. from 
the vertical. 
( 2 ) 
o ' 
28 30 
28 40 
28 35 
28 40 
28 35 
28 43 
(1) 94 38 50 
(2) 28 37 10 
66 01 40 
33 00 50 
123 16 00 
61 38 00 
Ther. 
Fah. 
62 
64 
Half sum =z dip. 
