124 
OBSERV ATIONS—Continued. 
MAGNETIC OBSERVATIONS. 
Station. Camp 96, Cedar Creek; latitude 35° 20 35". 09 ; longitude Th. 29m. 18-۰ 
Needle, B. Date, January 9, 1854. Hour of beginning, 3h. 30m. p. m. ; hour of ending, 4h. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
Needle vertical, face of circle north, reading of azimuth circle 
Needle vertical, face of circle south, reading of azimuth circle 
Reading of azimuth circle when plane of instrument is in the magnetic meridian 
Reading of azimuth circle when plane of instrument is in the true meridian 
Approximate magnetic declination 
——————— mm mm mm ee 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Def. with wt. 2 gr. Def. with wt. 23 gr. Def. with wt. 3 gr. 
> 
Face of circle. Direct. Et 
Def. towards | Def. from | Ther. | Def. towards] Def. from | Def. towards | Def. from 
the vertical. | the vertical. | Fah. | the vertical. | the vertical. | the vertical. | the vertical. 
(1) (2) (1) (2) (1) (2) 
E E ood 0 or o , o , ° , 
61 55 87 50 35 50 44 94 45 28 40 102 45 20 42 
INE 27 61 60 87 50 2D. 15.1. 1 94 50 28 35 102 35 20 49 
61 58 87 55 Hub. 45 STE 94 40 28 35 102 20 40 
61 60 87 55 E sn 94 55 a 28 40 102 35 20: 35 
RUD MESSPONQN EE 61 59 87 7 NB WT 77 94 50 28 30 102 25 20 ST 
61 54 87 50 85 55 44 94 45 28 40 102 30 20 30 
£e " o , " o o , ” 0 , ” 
ü) 87 52 50 (1) 94 47 30 (1) 102 35 50 
Means ---- ------ 61 57 40 1 (2) 35 49 10 4 (2) 28 36 40 (2) 20 37 20 
Cor. for index er- GR 
ror of needle...| + 8 48 
Deduced inclina- | ° 
کک‎ S Ln 62 06 28 
O , ” o , " o , و‎ 
Differences Bard Lo 66 10 50 81 58 30 
Half diff. orangles o , ” o , ” ° , " 
of deflection مو‎ SL تھق‎ — Ls 83 05 25 40 59 15 
° , ” ° , ” ° , Lui 
Sum of means 12s ` ZS A 2 133 . 94 10 123 13 10 
o , " o , " o , " 
Half sum — dip.. 61 51 00 ”7828ء‎ 61 42 5 61 36 35 j 
- | SE in 
