۱ MAGNETIC OBSERVATIONS. 151 
^ OBSERV ATIONS— Continued. 
Station, Camp 141, Sand Camp ; latitude 350 05! 36”. 25 ; longitude Th. 43m. 03. 13s. 
Needle, B. Date, March 7, 1854. Hour of beginning, 4h. 30m. p. m. j hour of ending, 5h. p. m. 
| i Observer, Lieut. J. C. Jee, Topographical Engineers. 
1 " š T4 52 
i Needle vertical, face of circle north, reading of azimuth circle 74 55 
74 55 
š ^ 74 50 
1 Needle vertical, face of circle south, reading of azimuth circle 74 7 
1 74 53 
i Reading of azimuth circle when plane of instrument is in the magnetic meridian 74 53 40 
$ os Reading of azimuth circle when plane of instrument is in the true meridian 
| S Approximate magnetic declination 
E OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY-— No. 4. 
E Def. with wt. 23 gr. Def. with wt. 3 gr. 
i Face of circle. Direct. | I 
3 Def. tcwards | Def. from the, Ther. | Def. towards | Def. from the Ther. 
i the vertical. | vertical. Fah. | the vertical. | vertical. Fah. 
| (1) 2) a) 
0 ot [e] 1 0 , | ° | [e] H ° , 
60 8 94 30 "n Santo: ege SW 18 18 60 
| 
East 60 42 94 28 HM uen | 102 35 18 p ۹ءء‎ 
60 42 94 35 26 33  |........ | 102 30 38 38 Lov. 
60 40 94 40 Ae Xo Mec h oi Le 
West K 60 42 94 38 26 40 |--------| 102 30 ES 00152 
60 38 94 35 26 98 | sB8.^| . 102 33 18 18 | 60 
| 
| | | | 
[e] t “ | [e] , yt | [e] | 0 ” | o 
|f () 94 34 20 | || (0) 10 31 20 
Means. 60 40 20 E (2) 26 36 40 x 58 | 0). 19-18 10 60 
x 
Cor. for index error of needle... + 8 48 | 
[e] , “ 
_ Deduced inclination.. 22 60 49 08 
0 7 " 0 D " 
y Differences 和 | HE 48 +4 48 
E | 
: ° + " | [e] , ” 
Half. diff. or angles of deflection -| - -. S3 wo Mo دی‎ | a8 S5 pu 
| . 
| 
o 7 xt | , ” 
Sum of means DI 8 O EE | 120 49 80 o Lh. 
| | | 
| — ol | o. گے‎ 
i | 60 35 30 E ۱ s HM |o- 
Half sum — dip | ie ی مسا و‎ ia am i | | | : 
