ar 
MAGNETIC OBSERVATIONS, 
OBSERV ATIONS— Continued. 
97 
Station, Camp 68, Inscription Rock; latitude 350 2' 40".86 ; longitude Th. 12m. 51.25. 
Needle, B. Date, November 18, 1853. Hour of beginning, 4h. 30m. p. m.; hour of ending, 5h. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
° , ” 
27 18 
Needle vertical, face of circle north, reading of azimuth circle 27 
27 14 
: fp mo 
Needle vertical, face of circle south, reading of azimuth circle 27 01 
| 27 0 
Reading of azimuth circle when plane of instrument is in the magnetic meridian 27 05 30 
Reading of azimuth circle when plane of instrument is in the true meridian 40 02 24 
Approximate magnetic declination 12 56 64 ۰ 
- OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Def. with wt. 2 gr. Def. with wt. 2} gr. 
Face of circle. Direct. | 
Def. towards| Def. from Ther. | Def. towards | Def. from Ther. 
the vertical. | the vertical. | Fah. | the vertical. | the vertical. | Fah. 
(1) (2) (1) (2) 
oi gear اوت‎ ° ice Oit o 
61 58 87 58 35 0 43 94 15 28 655 43 
East 61 53 87 55 A e O 94 20 Ea الہ و‎ 
61 55 87 60 5ک‎ 7:50 E POS 94 15 TA 
61 57 87 50 وا‎ 48 ana 94 25 . ے .لا‎ 2 86 
West... 61 50 87 45 S0 و دحا ید[‎ 94 30 aM Aou. 
61 50 87 40 35 55 43 94 31 28 48 43 
| 
° , ” [e] , " O o , ” 0 
(1) 87 51. 20 1 (1) 94 22 40 } 
Means. | 61 53. bé d (2) 35 49 20 } 43 110) 28 46 20 n 
t 
Cor. for index error of needle...| 十 8 48 
: [9] , " 
Deduced inclination...........- 62. 2.88 
0 D Di o , ” 
Differences. : 52.02.00 E ۳۳۰ وھ‎ ` FE 
سو ی‎ 了 
Half diff. or angles of deflection.-|------------ 26 01 00 |-------- 32 48 10 |-------- 
[e] D ” [e] , " 
Sum of means + ca 4 4  ....... 123 09 0B. — anes 
- w Oo Lé Ld o Lé " 
Half sum — dip 8H MS L...- HM wx» ؤ‎ 7 
