122 . MAGNETIC OBSERVATIONS. 
OBSERVATIONS—Continued. 
Station, Camp 91, PR latitude 359 16’ 48.7 ; longitude Th. 26m. 38.1 
Needle, B. Date, December 29, 1853. Hour of beginning, 3h. 40m. p. m. ; hour of En 4h. 30m. p. m. 
Observer, Lieut. A. W. GA Topographical Engineers. 
° , ” 
87 01 
Needle vertical, face of circle north, reading of azimuth circle | 8T 8 
87 50 
87 655 
Needle vertical, face of circle south, reading of azimuth circle j 81. bT 
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. 
Def. with wt. 23 gr. Def. with wt. 3 gr. 
Face of circle. Direct. | | 
Def. ibis Def. f Ther. |Def. towards| Def. from Ther. 
Ve Vertical. | the اق‎ Fah. | the vertical. | the vertical. | Fah. 
a (2) (1) (2) 
o mm o AS, o 79 o کہ‎ 2 5. 7 ٥ 
61 30 94 30 27 52 44 102 28 19 45 44 
East 61 28 94 37 WII ia ھا جس‎ 102 40 19.401.229. 
61 27 94 30 2-504 EE 102 28 19.50... rime 
61 15 94 .22 2| XD e 359922 102 00 19"-909 ee حم‎ 
West 61 28 94 15 27 58 15.00 - se 102 12 19 . 48 ۰ dices 
61 20 94 15 27 40 38 102 02 19 0 38 
o , " 0 ” 0 0 , ” [e] 
M (1 94 24 50 (1 102 18 20 
cans um m | (2) 27 50. 50 4 (2) 19 40 30 n 
Corr. for index error of needle..| 十 8 48 
[9] D "n 
Deduced inclination............. 61 33 28 
i , "m o , ” 
Differences... b us o0 Ll جو و مر‎ 50." Bo 
0 , " ° , ” 
Half diff. or angles of deflecti en I OEC ھا‎ 人 
[e] , "m , " 
Sum of means BI O e. Eo iros 121. 58 50 — | 2 
o , te o , " 
Half sum — dip تال‎ MU WER 42 60 59 25 [|.-.----- ` 
