128 MAGNETIC OBSERVATIONS. 
OBSERVATIONS —Continued. 
Station, Camp 108, Williams’ river ; latitude 35° 06' 34".3 ; longitude Th. 32m. 50.155. 
Needle, B. Date, January 28, 1854. Hour of beginning, 1h. 30m. p. m.; hour of ending, 1h. 50m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
[e] , ” 
$ 60 59 
Needle vertical, face of circle north, reading of azimuth circle 60 50 
¢ 60 Se 
$ 60 62 
Needle vertical, face of circle south, reading of azimuth circle 60 50 
à 60 55 
Reading of azimuth circle when plane of instrument is in the magnetic meridian 60 55 20 
Reading of azimuth circle when plane of instrument is in the true meridian 74 35 36 
Approximate magnetic declination 13 40 16 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Def. with wt. 2 gr. Def. with wt. 2} gr. Def. with wt. 3 gr. 
Face of circle: Direct. 
Def. towards | Def. from | Ther. | Def. towards, Def. from | Def. towards, Def. from 
the vertical. | the vertical. | Fah. | the vertical. | the vertical. | the vertical. | the vertical. 
(1) (2) (1) (2) (1) (2) 
o 1 0 4 o 1 o 0 tt [e] H [e] f o 1 
61 10 87 58 34 07 72 95 35 26 43 103 45 18 20 
Mi کے بے کے‎ 61 08 87 62 ae UD. oa 95 20 26 45 103 .35 18 18 
61 10 87 67 ما‎ Sa 95 30 26 40 103 45 18 25 
61 07 87 50 SE 0p D. if 95 25 26 45 108 15 18 20 
Nos. au nd 61 10 87 62 34 UO 1... 0 95 45 26 40 103 20 18. 5 
61 05 87 58 34 10 68 95 25 26 45 103 25 18 15 
@ F ۷ ° 0 , " 
(1) 87 59 30 (1) 95 30 00 (1) 103 30 50 } 
sss TOTUM | (2) 34 05 50 m" (2) 26 43 00 (2 18 18 50 
Cor. for index er- E 
ror of needle...| 十 8 48 
— 
Deduced inclina- | ° ' ^" 
AAA 61 17 08 i 
o , a o 1 7 Q f Hi 
Differences ba. B9 499 o1. کے‎ 68 47 00 85 1.40 
i .orangles o / “ ° 1 ^ ° ' " 
of deflection 20 00 DES "AN i 34 23 30 42. 36. 00 
° 7 m " [»] , " 
Sum of means AAA . Db 32055. 1i... 122.. 13 ` 00 121 149 40 
o 1 7 0 1 “ ° , " 
Half sum — dip -- | oie و بی‎ a d 4 1... 61 06. 08 60 54 50 
Norz.—For the remaining magnetic observations at Camp 108, see page 116. 
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