Reading of azimuth circle when plane of instrument is in the true meridian 
Approximate magnetic declination 
MAGNETIC OBSERVATIONS, 139 
OBSERV ATIONS— Continued. 
Station, Camp 123, Williams’ River ; latitude 34° 13' 44". 10 ; longitude Th. 34m. 36.778. 
Needle, B. Date, February 16, 1854. Hour of beginning, 3h. 40m. p. m.; hour of ending, 4h. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o " 
1 , j 93 34 
Needle vertical, face of circle north, reading of azimuth circle 93 34 
( 98 4 
" Í 93 31 
Needle vertical, face of circle south, reading of azimuth circle 93 40 
i | 93 31 
Reading of azimuth circle when plane of instrument is in the magnetic meridian 93 34 00 
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) 2 3) 
° Ost 6.28 e jt o ھا‎ D o 
60 00 94 05 25 7 72 102 20 17 ..30 72 
East .... 60 02 94 18 209.405 J esanei 102 35 "Kë ` S E AAE 
60 00 94 05 2550 مت سدح داد‎ 102 30 I ae cere 
60 02 94 18 "o lii 102 20 it. cs ns 
West 60 02 94 10 25.480 سو 7 نر 20 102 و لاہ ںا‎ wees 
60 0 94 12 25 60 72 102 15 17 0 72 
| | 
[o] , ” 0 , "m o | r " o 
O 94 11. 20 1 )1( 102 23 0 
Nm. e MI 1 (2) 25 56 40 "n (2) 17 31 40 = 
Corr. for index error of needle--| + 8 48 : | 
o , "m 
Deduced inclination ..........- 60 09 48 
3 o " " o d " 
Differences 88. 14 40. L HE SI. 40... eee 
i 
o ` " 6 7 " 
E Half diff. or angles of deflection 8 wo» j- 42 25 50 — |-----=-- 
tu 
, " [e] r Hi 
i Sum of means ہو‎ ua "MO ا‎ [L.-..... | 119 855. 00 پت‎ Lh... 
o , " | 0 Lé " 
HiH aum ہے‎ dip متام موھج کھج کے‎ rmt 和 | 56 5T — DU بے ساب ھی‎ 
Night cloudy. No observations for declination. 
