OBSERV ATIONS— Continued. 
Station, Camp 61, Isleta ; latitude 340 54' 27". 06 ; longitude Th. 06m. 40s. 
Needle, B. Date, November 9, 1853. Hour of beginning, 4h. p. m. ; hour of ending, 5h. p. m. 
MAGNETIC OBSERVATIONS. 
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 
H 
Reading of azimuth circle when plane of instrument is in the true meridian 
Approximate magnetic declination 
13 15 25 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
Def. with wt. 1 gr. 
Def. with wt. 2 gr. 
Def. towards | Def. from Ther. Def. from | Ther‏ ی 
the vertical. | the vertical. | Fah. the vertical. | Fah.‏ 5 
)2( )2( )1( 
gu pc or SC? o‏ 
12 62 
East 62 15‏ 
08 62 
8 .,. می y: xm. MORE E e BEDAE‏ 35 49 18 62 
West 62 2 49 38 EE Lore "ZE ` gr 8‏ 
53 08 88 58 74 37 49 20 :62 
[e] , " o , " | 7 " o‏ 
} 40 31 36 )1( 40 36 49 )1 
e 62 15 40 d "i 74 54 2| | (2) 88 04 20 »‏ 
Cor. for index error of needle...| 十 8 48 x‏ 
Cor. f‏ : 
Deduced inclination...........- 62 24 28‏ 
o , " "‏ 
tr ta as 40 1 d‏ وت Differences. 25 17 w‏ 
o , " "‏ 
Half diff. or angles of deflection 12 38 50 PA 46 20 Loos‏ 
Sum of means Ji BD M |- 36 00‏ 
| | 
o 7 7 " |‏ 
Half sum — dip B8 D s» |... 18 00 eM‏ 
e 12 m‏ 
