MAGNETIC OBSERVATIONS, 
111 
OBSERVATIONS—Continued. 
Station, Camp 77, near Rio Puerco of the West; latitude 34° 57' 56".58; longitude 7 h. 19 m. 28.82s. 
Needle, B. Date, December 3, 1853. Hour of beginning, 4 h. 10m. p. m.; hour of ending, 4A. 35m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o / 
( 55 56 
Needle vertical, face of circle north, reading of azimuth circle......■? 55 GO 
( 55 59 
f 55 59 
Needle vertical, face of circle south, reading of azimuth circle____..■? 55 60 
( 55 57 
Reading of azimuth circle when plane of instrument is in the magnetic meridian... 55 5S 30 
Reading of azimute circle when plane of instrument is in the true meridian.. 69 58 35 
Approximate magnetic declination_____ 14 00 05 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
East. 
West 
Means 
Corr. for index error of needle.. 
Deduced inclination 
Differences 
Half diff. or angles of deflection. 
Sum of means. 
Direct. 
Def. with wt. 2 gr. 
Def. with wt. 2-J gr. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
(2) 
Ther. 
Fall. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
(2) 
Ther. 
Fall. 
O ' 
61 35 
61 38 
61 40 
61 40 
61 35 
61 36 
O ’ 
87 40 
87 42 
87 43 
87 40 
87 33 
87 30 
O ’ 
35 20 
35 28 
35 28 
35 20 
35 10 
35 20 
o 
62 
O ' 
94 33 
94 40 
94 30 
94 32 
94 40 
94 3G 
O ' 
28 28 
28 25 
28 29 
28 15 
28 10 
28 10 
o 
62 
62 
62 
o ' " 
61 37 20 
O ' " 
\ (1) 87 38 00 ) 
1 (2) 35 21 00 \ 
o 
62 
O ' " 
j (1) 94 35 10 } 
j (2) 28 19 30 \ 
o 
62 
+ 8 48 
t 
\ 
o ' " 
52 17 00 
O ' " 
66 15 40 
o ' " 
61 46 08 
o ' " 
26 08 30 
O ' " 
33 07 50 
O ' " 
122 59 00 
O ' " 
122 54 40 
O ' " 
61 29 30 
O ' " 
61 27 20 
Half sum — dip 
