MAGNETIC OBSERVATIONS. 
95 
OBSERVATIONS—Continued. 
Station, Camp 67, Agua Fria ; latitude 35° 01' 35". 56; longitude 7h. 11m. 53 s. 
Needle, B. Bate, November 17, 1853. Hour of beginning, 4 h. 30m. p. m. ; hour of ending, 5 h. 10m. p.m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o ' " 
f 7 22 
Needle vertical, face of circle north,reading of azimuth circle. \ 7 19 
( 7 30 
f 7 46 
Needle vertical, face of circle south, reading of azimuth circle. 4 7 35 
( 7 41 
Reading of azimuth circle when plane of instrument is in the magnetic meridian.. 7 32 10 
Reading of azimuth circle when plane of instrument is in the true meridian... 20 57 42 
Approximate magnetic declination_ 13 25 32 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
Direct. 
East. 
West. 
Means. 
Corr. for index error of needle... 
Deduced inclination. 
o ' 
61 60 
61 50 
61 70 
61 55 
61 57 
61 45 
61 56 10 
+ 8 48 
Differences. 
Half diff. or angles of deflection. 
Sum of means.. 
Def. with wt. 2 gr. 
62 04 58 
Def. towards 
the vertical. 
' ( 1 ) 
Def. from the 
vertical. 
( 2 ) 
o ' 
87 45 
87 35 
87 45 
87 28 
87 30 
87 25 
o ' 
36 05 
36 03 
36 08 
35 50 
36 10 
35 58 
(1) 87 34 40 
(2) 36 02 20 
o ' 
51 32 
20 
25 46 10 
Ther. 
Fah. 
o 
46 
46 
o 
46 
Def. with wt. 2£ gr. 
Def. towards 
the vertical. 
( 1 ) 
o ' 
94 15 
94 20 
94 25 
94 15 
94 20 
94 18 
Def. from the 
vertical. 
(2) 
o ' 
28 50 
28 47 
28 60 
28 40 
28 45 
28 48 
J (1) 94 
I (2) 28 
18 
48 
50 
20 
o 
65 
30 
123 37 00 
61 48 30 
32 45 15 
o ' 
123 07 10 
61 33 35 
Ther. 
Fah. 
o 
46 
46 
o 
46 
Half sum — dip. 
