132 MAGNETIC OBSERVATIONS. 
OBSERV ATIONS— Continued. 
Station, Camp 112, Bighorn Spring ; latitude 35° 00' 51".53; longitude Th. 34m. 24.58s. 
Needle, B... Date, February 4, 1854. Hour of beginning, 2h. 45m. p. m. ; hour of ending, 3h. 15m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
0 , "m 
52 17 
Needle vertical, face of circle north, reading of azimuth circle 52 18 
i 52 10 
52 15 
Needle vertical, face of circle south, reading of azimuth circle ۱ 52 20 
52 17 
Reading of azimuth circle when plane of instrument is in the magnetic meridian.................. 52 16 10 
Reading of azimuth circle when plane of instrument is in the true meridian 66 34 07 
Approximate magnetic declination 14 17 57 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY —Nq. 4. 
Def. with wt. 2 gr. | Def. with wt. 23 gr. Def. with wt. 3 gr. 
Face of circle. Direct. | | 
Def. دہ جیا‎ p Def. from 2 |Def. towards | Def. from | Def. towards | Def. fro 
the vertical. | the vertical. the vertical. | the vertical. | the vertical. | the veriti 
a (2) (1) (2) ) (2) 
[9] H O , O 7 0 , O ! 0 ' [e] و‎ 
60 55 87 25 38 563 73 94 45 26 40 102 58 18 . 20 
East 60 50 87 25 33 S80. haszon 94 50 26 45 102 50 18 28 
60 55 87 30 eo Oe E رم اما‎ 94 45 26 45 102 60 18 25 
60 55 87 25 288 4b lace nue 94 45 26 40 102 50 18 20 
Weel c. 69 50 87 0 SS او‎ Lil... 94 50 26 35 102 55 18 30 
60 53 87 12 33 50 +3 94 40 26 35 102 55 18 15 
ECF TF 0 r " [e] o H " 0 ۱ " 
(1) 87 23 50 (1) 94 45 50 (1) 102 54 40 1 
Mods 60 53 00 d (2) 33 57 20 73 (2) 26 40 00 (2) 18 24 40 
Cor. for index er- ro 
ror of needle...| 十 8 48 
Deduced inclina- | O Im 
tion 61 01 48 
! o H " o D " [e] , " 
Differences. b 126 JU L1 کیک‎ 68 05 50 84 30 00 
Half diff. or angles o , H [e] , " ° , ” 
3 . of deflection A ` [pu 84 02 55 43 186 00 
o , r [e] , " [e] 7 ” 
Sum of means | J. NH 1 331.1... 121 25 50 121 — 19 29 
o D n 5 0 r " , ” 
| " WM —..... 60 43 55 60 39 40 
