MAGNETIC OBSERVATIONS. 
OBSERV ATIONS— Continued. 
Station, Camp No, 59, Albuquerque. Date, October 18, 1853. 
OBSERVATIONS ON POLARIS. 
Face of circle. Whether observations are | Time of observa- | Reading of | Computed azi- | Reading of azimuth 
direct or by reflection. | tion by chrono- | azimuth cir- | muth of Po- | circle when plane 
meter No. 2475. cle. aris. of instrument isin 
the true meridian 
h. m. 8. 0 ۰ , " [e] , ” 
Direct 1.47 21.3 52 1 
West {| Direct 1 sw] mw سب رب‎ 
Direct 1 $5 42.1 52 20 
€ { Direct 1 39 58.5 52 21 m 0 E 
Reading of azimuth circle when plane of instrument is the true meridian, by mean of four observations. | 51 54 51 
Error of chronometer + 1m. 295. 
Station, Camp 59, Albuquerque ; latitude 359 5' 50" ; longitude Th. 6m. 31. 47s. 
Needle, A. Date, October 19, 1853. Hour of beginning, 10 a. m.; du A j 11 a. m. 
Observers, Lieut. A. W. Whipple and Lieut. d V. M Topographical 
BÀ A " 
: . 88 39 
Needle vertical, face of circle north, reading of azimuth circle > ei 
88 24 
Needle vertical, face of circle south, reading of azimuth circle 38 = 
Reading of azimuth circle when plane of instrument is in the magnetic meridian ------------------ 38 30 20 
Reading of azimuth circle when plane of instrument is in the true meridian.....................- 51 54 51 
Approximate magnetic declination 13 24 31E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 3. 
| 
Def. S. at app. dip. 62° 9. Def. N. at app. dip. 62° 9’. 
i Direct. 
TM ee * Def. towards |Def. from the Ther. | Def. towards Get from the| Ther. 
the vertical.| vertical. Fahr. | the vertical. | vertical. Fahr. 
1 
| | 
o , O , " 0 , " ° o , " | [9] , " | Š 
62 20 | 96 60 27 17 74 | 99 25 830 2 3 
e. 62 15 | 96 62 E dE. ٦ NO 70 
«62 10 | 96 M o3 . Se: 93 37 DM A Loc 
62 7 | 96 65 27 10 72 | 93 15 | 30 53 13 
West - 62 2 |96 57 SUN 6 93 18 8 رو‎ 
62 0 |96 61 oS € 1. 93 23 | 5 4 — 1. 
Means. 62 9 | 9 0 7 16 20| 75 | 95 24 30 | 30 51 al 73 
Far 16 ELI oues |-------- 30 51 | | 
Í lea 
Sum of means. 124 16 20 | 124 16 10. | 5 
Half sum — di e 8 10 | @ 8 بس تس اوھ‎ Es 
Difference of means ELS 69 43 40 | 62 32 Mil | 
一 一 一 一 Sech | 
Half dif. — angle of deflection و‎ A | a 46 25 | 
