MAGNETIC OBSERVATIONS. 
103 
OBSERVATIONS—Continued. 
Station, Camp 72, Cedar Forest; latitude 35° 1' 13".23; longitude 111. 15m. 38.46.?. 
Needle, B. Date, November 28, 1853. Hour of beginning, 3 h. 30 m. p. m.; hour of ending, Hip. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o u n 
I 90 06 
Needle vertical, face of circle north, reading of azimuth circle.. I 90 08 
( 96 06 
i 90 00 
Needle vertical, face of circle south, reading of azimuth circle..._I 90 05 
( 90 02 
Beading of azimuth circle when plane of instrument is in the magnetic meridian.... 90 04 30 
Beading of amizuth circle when plane of instrument is in the true meridian..... 103 05 53 
Approximate magnetic declination .....______ 13 01 23 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
Direct. 
Def. with wt. 2 gr. 
Def. towards Def. from 
the vertical, the vertical. 
(1) (2) 
Ther. 
Fall. 
Def. with wt. 21- gr. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
( 2 ) 
Ther. 
Fah. 
East. 
West. 
61 33 
61 28 
61 35 
61 30 
61 32 
61 31 
Means.. 
61 31 30 
Corr. for index error of needle. 
Deduced inclination 
+ 8 48 
i // 
61 40 18 
Differences. 
Half diff. or angles of deflection. 
Sum of means 
87 40 
87 30 
87 45 
87 32 
87 25 
87 30 
o / 
35 37 
35 28 
35 32 
35 40 
35 38 
35 37 
o 
56 
55 
94 03 
94 05 
94 10 
94 08 
94 12 
94 15 
28 25 
28 30 
28 30 
28 30 
28 25 
28 29 
j (1) 87 33 40 ) 
j (2) 35 35 20 \ 
55.5 
j (1) 94 08 50 
} (2) 28 28 10 
51 58 20 
65 40 40 
o > n 
25 59 10 
O/l' 
32 50 20 
123 09 00 
122 37 00 
Oil’ 
61 34 30 
o ' '' 
61 18 30 
o 
56 
55 
55.5 
Half sum — dip 
