ic 
MAGNETIC OBSERVATIONS. 
149 
0188101171۲ ATIONS— Continued. 
Station, Camp 140, near Marl Springs ; latitude 35° 11 8". 0; longitude Th. 42m. 10. 30s. 
Veedle, B. Date, March 6, 1854. Hour of beginning, 4h. 15m. p. m.; hour of ending, 4h. 45m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o , ” 
3 ; G Í 82 05 
Needle vertical, face of circle north, reading of azimuth circle 82 05 
( 82 02 
` 82 00 
Needle vertical, face of circle south, reading of azimuth circle 82 02 
82 02 
Reading of azimuth circle when plane of instrument is in the magnetic meriqian -2-22-2222 82 02 40 
Reading of azimuth circle when plane of instrument is in the true meridian 96 01 45 
Approximate magnetic declination 13 59 05 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY —No. 4. 
Def. with wt. 2} gr. Def. with wt. 3 gr. 
Face of circle.* Direct. 
Def. towards | Def. from the | Ther. | Def. towards | Def. from the! Ther. 
the vertical. | vertical Fah. |the vertical. | vertical. Fah. 
(1) (1) (2) 
» 
[6] , o , 9 , ° o , 0 Ji o 
60 46 94 50 26 30 51 102 55 18 20 54 
A E 60 47 94 45 26:628 aa 102 48 A8. لا‎ Jeria das 
60 45 94 45 6 08. 1. سح میات‎ | 102 58 18 15 1... 
| 
: 60 47 94 40 Se SR 67809 | 102 45 18. ` orae des 
West 60 50 94 38 29 La. | 102 55 | 18 18 [oo 
60 47 94 40 26 -35 | 51 | 102 40 | 18 10 | 54 
| | 
o ? ff H ” o 0 , " o 
(1) 94 43 00 : (1) 102 50 10 } 
. Y a 
Corr. for index error of needle-- 8 48 
0 D " 
Deduced inclination ..........- 60 55 48 
o , ” 0 , 
Differences 68. 12 50:  Looss--. 84 33 
o , ” o x 
Half diff. or angles of deflection- ------------ | u Ww S p 42 16 
+ ” [e] , 
Sum of EM 3 G4 ۶2 121: . 07 
0 L4 
60 33 
