122 
MAGNETIC OBSERVATIONS. 
OBSERVATIONS—Continued. 
Station, Camp 91, Leroux’s Spring; latitude 35° 16' 48”.77; longitude 7 li. 26m. 38. 18s. 
Needle, B. Date, December 29, 1853. Hour of beginning, 3h. 40m. p. m. ; hour of ending, 4 h. 30 m. p. m. 
Observer, Lieut. A. IF. Whipple, Topographical Engineers. 
O ' n 
( 87 01 
Needle vertical, face of circle north, reading of azimuth circle_ -] 87 23 
( 87 50 
( 87 55 
Needle vertical, face of circle south, reading of azimuth circle...-J 87 57 
( 87 65 
Reading of azimuth circle when plane of instrument is in the magnetic meridian...:.. 87 41 50 
Reading of azimuth circle when plane of instrument is in the true meridian... 101 34 16 
Approximate magnetic declination....... 13 52 26 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
Direct. 
Def. with wt. 24 gr. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
(2) 
Ther. 
Fah. 
Def. with wt. 3 gr. 
Def. towards 
the vertical. 
( 1 ) 
Def. from 
the vertical. 
( 2 ) 
Ther. 
Fah. 
East. 
West 
Means... 
Corr. for index error of needle.. 
Deduced inclination... 
Differences... 
Half cliff, or angles of deflection. 
Sum of means 
Half sum — dip... 
o ' 
61 30 
61 28 
61 27 
61 15 
61 28 
61 20 
o ' " 
61 24 40 
+ 8 48 
o ’ '/ 
61 33 28 
o ' 
94 30 
94 37 
94 30 
94 22 
94 15 
94 15 
o ' 
27 52 
27 55 
27 55 
27 45 
27 58 
27 40 
o 
44 
38 
o ' 
102 28 
102 40 
102 28 
102 00 
102 12 
102 02 
o < 
19 45 
19 40 
19 50 
19 30 
19 48 
19 30 
j (1) 94 24 50 ) 
} (2) 27 50 50 f 
o 
41 
( (1) 102 18 20 ) 
1 (2) 19 40 30 ) 
66 34 00 
82 37 50 
33 17 00 
41 18 55 
122 15 40 
121 58 50 
61 07 50 
60 59 25 
o 
44 
38 
o 
41 
