MAGNETIC OBSERVATIONS. 
OBSERV ATIONS— Continued. 
117 
Station, Camp 83, Colorado Chiquito ; latitude 35° 05' 18".26 longitude; Th. 22m. 12. 09s. 
Needle, B. Date, December 15, 1853. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
Hour of beginning, 11h. 30m. a. m.; hour of ending, 12h. 30m. p. m. 
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 
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. | Def. towards | Def. from | Ther. | Def. towards | Def. from | Def. from |Def. towards 
the vertical. | the vertical. | Fah. | the vertical. | the vertical. | the vertical. | the vertical. 
(1) (2) (1) (2) (2) (1) 
o 7 o ? [e] ' o 0 ' 0 , o , o 7 
61 38 87 55 35 18 43 94 40 28 05 20 00 102 25 
o AE توق 50 87 42 61 موی‎ 0 94 35 28 10 20 05 102 30 
61 40 87 45 36 22 میا‎ 94 40 28 12 20 05 102 32 
61. 83 87 40 35 15. ]---..- 94 45 28 03 20 00 102 25 
Woi nu T 61 30 87 40 35 20 |------ 94 30 28 00 20 00 102 15 
61 29 87 50 35 25 41 94 40 28 00 20 02 102 25 
Bc 3 0 r n o " | ° , zr 
1) 87 46 40 (1) 94 38 20 } i (1) 102 25 20 } 
Means لی‎ 6L 95.20 1 2) 35 20 00 ۱ 42 | (2) 28 05 00 (2) 20 02 00 
Corr. for index er- r 
| + 8 48 | 
Deduced inclina- | O ' ~ | 
tion 61 44 08 | 
o , ^" | [9] , ” [e] 7 11 
Differences 52 26 49 o4 GER | 66 ss 20 82 23 20 
Half diff. or angles o , " | | o , “ | ° i 7 
of deflection 2 26 13 20 Kee 33 16 40 41 11 40 
| | 
O 9 r | o d ” ° 7 Dy 
Sum of means ds -06 — 40 | EE | ۱99 —45 20 ns 4 M» 
| 
o , “ ° # “ o , ” 
Half sum — dip...|.-........| 61 33 309 L2 61 21 40 61 13 40 
۱ 
Night cloudy ; no observations for declination. 
