118 MAGNETIC OBSERVATIONS. 
OBSERV ATIONS— Continued. 
Station, Camp 84, Rio Colorado Chiquito ; latitude 359 12' 02”.77 ; longitude Th. 22m. 29. 64s. 
Needle, B. Date, December 16, 1853. Hour of beginning, 3h. 40m. p. m.; hour of ending, 4h. 10m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
[e] , " 
89 00 
Needle vertical, face of circle north, reading of azimuth circle 89 11 
89 00 
89 00 
Needle vertical, face of circle south, reading of azimuth circle 89 09 
e 89 15 
Reading of azimuth circle when plane of instrument is in the ti idi 89 05 50 
Reading of azimuth circle when plane of instrument is in the die meridian 102 45 18 
Approximate magnetic declination 13 39 28 E. 
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. towards | Def. fro 
the vertical. | the vertical. | Fah. | the vertical. | the vertical. | the vertical. | the vertical. 
(1) (2) (1) (2) (1) (2) 
ger œ ¢ Gir? o ض. یچ ھ04‎ Gy + OR. 
61 34 87 45 35 28 43 94 30 28 15 102 25 20 20 
E سو اھ‎ 61 32 87 48 SEC ZO odere 94 20 28 20 102 15 20 12 
61 40 87 50 55. 30 2. 12.22. 94 27 28 18 102 30 20 10 
61 36 87 50 35۲ 98 |l. 94 5 28 0 102 25 20 15 
West 61 38 87 40 385320. eL. 94 15 28 10 102 10 20 20 
61 38 87 40 35 28 43 94 40 28 08 102 20 20 15 
O , " [e] 1 Hi [0] o 7 Hi 
M (1 87 45 30 (1 94 27 50 (1). 103 20 a 
— "NOS i (2) 35 26 30 = g (2) 28 11 50 (2 20 15 
Cor. for index er- q 
ror of needle...| + $8 48 
Deduced inclina- | © “ 
tion 61 45 08 a 
° , ” [e] 2 " 0 ^ , “ 
Differences 52 19 UU facs 66 16 00 82. 05 30 
Half diff. orangles | o 1 , ° , ” ° , “ 
of deflection me —99 30 کک‎ cu s 33 08 00 41 02 45 
o , 7 ° , wv o 1 “ 
Sum of means Bee D 00 3X 3 [L... 122 39 40 1923. 36 10 
o , " o , r o 1 “ 
E" A "Ww M 3L. 61 19 où 61 18 05 
