MAGNETIC OBSERVATIONS. 
83 
OBSERVATIONS—Continued. 
Station, Albuquerque; latitude 35° 05' 50"; longitude ~ih. 00m. 31.47s. 
Needle, A. Date, October 18, 1853. llour of beginning, 12 h. 15 m. p. m.; hour of ending, 1 h. 30 m. p. m. 
Observers, Lieut. A. W. Whipple and Lieut. J. C. Ives, Topographical Engineers . 
o ' " 
( 38 51 
Needle vertical, face of circle north, reading of azimuth circle__I 38 21 
( 38 55 
f 38 55 
Needle vertical, face of circle south, reading of azimuth circle-----j 38 44 
( 38 23 
Reading of azimuth circle when plane of instrument is in the magnetic meridian_ 38 41 30 
Reading of azimuth circle when plane of instrument is in the true meridian_ 51 54 51 
Approximate magnetic declination___ 13 13 21 
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. 
Fah. 
Def. with wt. 2. 5 gr. 
Def. towards 
the vertical. 
( 1 ) 
Def. from 
the vertical. 
( 2 ) 
Ther. 
Fah. 
East. 
West. 
Means .. 
Differences. 
o ' 
62 20 
62 25 
62 13 
62 07 
62 05 
62 00 
o ' " 
62 11 40- 
Half differences, or angles of 
deflection... 
Sum of means . 
Half sum — dip. 
o ' 
87 58 
87 55 
87 52 
87 32 
87 30 
87 47 
o ' 
36 50 
36 48 
36 52 
36 28 
36 30 
36 25 
o 
75.5 
74.5 
75 
75 
o ' 
94 45 
94 58 
94 53 
94 45 
94 40 
94 23 
o ' 
29 50 
29 40 
29 38 
29 30 
29 40 
29 42 
(1) 87 45 40 
(2) 36 38 50 
75 
(1) 94 44 00 
(2) 29 40 00 
51 06 50 
65 04 00 
o ' " 
25 33 25 
32 32 00 
124 24 30 
24 24 00 
62 12 15 
62 12 00 
o 
74.5 
75 
75 
75 
