MAGNETIC OBSERVATIONS, 
109 
OBSERV ATIONS— Continued. 
Station, Camp 76, near Lithodendron Creek ; latitude 35° 02 01^. 83 ; longitude Th. 18m. 43. 26s. 
Needle, B. Date, December 2, 1853. Hour of beginning, 4h. p. m. ; hour of ending, 4h, 30m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
[e] , “ 
$ 56 36 
Needle vertical, face of circle north, reading of azimuth circle - 56 0 
| ( 5 37 
$ 56 34 
Needle vertical, face of circle south, reading of azimuth circle 56 23 
( WW n 
Reading of azimuth circle when plane of instrument is in the magnetic meridian................... 56 38 40 
Reading of azimuth circle when plane of instrument is in the true meridian 70 8 
Approximate magnetic declination 13 32 388 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
* Def. with wt. 2 gr. Def. with wt. 2] gr. 
Face of circle. Direct. | 
Def. towards | Def. from the Ther. | Def. towards | Def. from the | Ther. 
the vertical. | vertical. | Fah the vertical. vertical. Fah. 
(1) (2) | (1) (2) 
° r o , o , o 0 , o " ٥ 
61 45 87 .30 35 33 59 94 50 28 29 59 
East 61 45 8T. 35 B0 Ao. 0و 40 94 تا‎ 78 
61 55 8 NW ee O 94 40 2" 3 Lo. 
61 48 87 30 35 30 | p 94 55 29 ماک و تھ و‎ 
West 61 45 8T 55 a IR 94 45 JE. E ee 
61 50 87 58 35 35 59 94 40 28 28 59 
۵: + Wé 0 0 o 
1) 87 41 20 (1) 94 45 00 l 
E EC 1 (2) 35 33 50 | دب‎ d ensa سی‎ 
رجا‎ 
Cor. for index error of needle... + 8 48 D 
| o! 
| Deduced inclination. ..........- 61 56 48 
o ۳ " o , 1r 
Differences 562-0] BO ee داع ماه وا‎ 66 10 6 
EN o , rr o , H" 
Half diff. or angl P3 HR M W Ug y co eke SS 93 0 3b eee 
o , " | o , “ 
Sum of means š 123 15 10 Keesen 123 10 50 سیت 0ھ‎ 
o 7 " | ° 1 : Hi 
TE uo. n 61 ^37 35 مس سوا‎ 61 35 25 0 
