MAGNETIC OBSERVATIONS, 
85 
OBSERVATIONS—Continued. 
Station, Camp No. 59, Albuquerque. Date, October 18, 1853. 
OBSERVATIONS ON POLARIS. 
Face of circle. 
Whether observations are 
direct or by reflection. 
Time of observa¬ 
tion by chrono¬ 
meter No. 2475. 
Reading of 
azimuth cir¬ 
cle. 
Computed azi¬ 
muth of Po- 
laiis. 
Reading of azimuth 
circle when plane 
of instrument is in 
the true meridian. 
West... 
Direct_-_ 
li. m. s. 
1 47 21.2 
O ' 
52 01 
18 08 
o ' " 
Direct_-_ 
1 45 03.5 
52 02 
51 43 22 
East..| 
Direct_ 
1 35 42. 1 
52 20 
14 10 
52 06 20 
Direct_ . 
1 39 58.5 
52 21 
Reading of azimuth circle when plane of instrument is the true meridian, by mean of four observations. 
51 54 51 
Error of chronometer 1 m. 29s. 
Station, Camp 59, Albuquerque; latitude 35° 5'50" ; longitude eh. (!;»,. 31.47s. 
Needle, A. Date, October 19, 1853. Hour of beginning, 10 a. m.; hour of ending, 11 a. m. 
Observers, Lieut. A. W. Whipple and Lieut. J. C. Lves, Topographical Engineers. 
o ' ' 
f 38 39 
Needle vertical, face of circle north, reading of azimuth circle..... I 38 25 
( 38 10 
f 38 24 
Needle vertical, face of circle south, reading of azimuth circle. < 38 33 
( 38 51 
Reading of azimuth circle when plane of instrument is in the magnetic meridian__.._ 38 30 20 
Reading of azimuth circle when plane of instrument is in the true meridian__-. 51 54 51 
Approximate magnetic declination...... 13 24 31 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 3. 
Face of circle. 
Direct. 
Def. S. at app. dip. 62° 9'. 
Def. N. at app. dip. 62° 9'. 
Def. towards 
the vertical. 
Def. from the 
vertical. 
Ther. 
Fahr. 
Def. towards 
the vertical. 
Def. from the 
vertical. 
Ther. 
Fahr. 
East. .. J 
O ' 
62 20 
62 15 
62 10 
62 7 
62 2 
62 0 
O ' " 
96 60 
96 62 
96 55 
96 65 
96 57 
96 61 
O ' " 
27 17 
27 15 
27 18 
27 10 
27 13 
27 25 
o 
74 
O ' " 
93 25 
93 29 
93 37 
93 15 
93 18 
93 23 
O ' " 
30 62 
30 47 
30 45 
30 53 
30 58 
30 45 
o 
73 
1 
West. i 
72 
73 
1 
Means.. 
73 
62 9 
97 0 
27 16 20 
27 16 20 
73 
93 24 30 
30 51 40 
30 51 40 
Sum of means.. 
124 16 20 
124 16 10 
Half sum — dip_ 
62 8 10 
62 8 5 
Difference of means.. . 
69 43 40 
62 32 50 
Halt dif. — ansle of deflection . _ 
34 51 50 
31 16 25 
_____ _ 1 
_ 
I 
