| MAGNETIC OBSERVATIONS. 103 
OBSERVATIONS—Continued. 
Station, Camp 72, Cedar Forest ; latitude 35° 1 13۷.98 ; longitude Th. 15m. 38.465, 
Needle, B. Date, November 28, 1853. Hour of beginning, 3h. 30m. p. m.; hour of ending, Ah p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
[e] M" "n 
Í 90 06 
Needle vertical, face of circle north, reading of azimuth circle ) 90 08 
96 06 
90 00 
Needle vertical, face of circle south, reading of azimuth circle | 90 05 
90 02 
Reading of azimuth circle when plane of instrument is in the magnetic idi 90 04 30 
Reading of amizuth circle when plane S instrument is in the true meridian .................--.-- 103 05 53 
Approximate magnetic declination 18 01 UR 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Def. with wt. 2 gr. Def. with wt. 2} gr. 
Face of circle. Direct. ` ç [ 
Def. towards | Def. from Ther. | Def. towards] Def. from Ther. 
the vertical. the vertical. | Fah. | the vertical. | the vertical. Fah. 
(1) ) (1) (2) 
o D o 9 o , o o D o D o 
61 33 87 40 35 7 56 94 03 28 25 56 
East 61 28 8 a fee oe .. .. 94 05 99 Mais 
61 35 87 45 SN a2 94 10 88 38 متا‎ 
61 30 87 32 35 (49 Än 94 08 BLO 0 
West 61 32 8T. 25 35۰1 38. dina 94 12 2 3 o6 
61 31 87 30 | 35 3T 55 94 15 28 29 | 55 
| 
| 
` ° , “ ° , ” ٥ 1 p" o 
: (1) 87 33 40 l : Lë 94 08 50 l 5.5 
Means 61 31 30 1) 35.35. 20 55.5 (2) 28 28 10 
, a ë 
Corr. for index error of needle..| 十 8 48 
^ D a 
Deduced inclination ........... 61 40 18 
s T , 7 o * " 
Differences 51 58 20  |-------- 6 4 ` Lll 
: o 1 7 ° , " 
Half diff. or angles of deflection. .|...........- 25o 0p M DE 32 50 20 ` [elci 
; E o 1 " o , $“ 
Sum of means NEC M ی‎ MU. W^ to... 
o , " D Hn 
Half um سے‎ A e aere چا‎ PW M سپ و رر‎ 27 BW pL... 
