MAGNETIC OBSERVATIONS. 127 
OBSERVATIONS-— Continued. 
Station, Camp 105, Williams’ river ; latitude 340 59’ 25".55 ; longitude Th. 31m. 49.95s. 
Needle, B. Date, January 23, 1854. Hour of beginning, 2h. p. m.; hour of ending, 2h. 30m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o ‘ u 
> ° P * § 82 04 
i Needle vertical, face of circle north, reading of azimuth circle 32 04 
۱ , UC ae 
, i $ 32 05 
Needle vertical, face of circle south, reading of azimuth circle 32 00 
( 32 00 
Reading of azimuth circle when plane of instrument is in the magnetic meridian 32 01 
Reading of azimuth circle when plane of instrument is in the true meridian 46 49 06 
Approximate magnetic declination 14 48 06E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Def. with wt. 2 gr. Def. with wt. 22 gr. | Def. with wt. 3 gr. 
Face of circle. Direct. n 
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. 
: (2) 1 (2) 
[9] 1 o 1 0 d o o 1 0 d , o 2 
60 58 87 05 34 28 65 94 25 27 05 102 30 19 00 
East 60 55 87 10 کک‎ ARAL 94 15 27 08 102 30 19 02 
60 57 87 08 354 20 lasses 4 20 | 13 102 35 19 02 
e 60 58 87 30 pe 20 AN keen 94 25 | 24 ۵ | 102 28 | 19 00 
` ۰ obe oris 60 60 8T .15 SI. 20. "a 94 25 | 27 10 | 102 20 19 00 
60 55 87 30 34 28 65 94 30 | 27 12 | 102 25 | 19 05 
B oy» ° 1 H DN F ° H a ° 1 7 
E D S 17.30 (1) 94 23 20 } (1) 102 28 00 | 
SE 60 57 10| {O 3 34 40 95 | i(2) 27 10 30 (2) 19 01 30 
Cor. for index er- d 
ror of needle ... +8, 48 
Deduced inclina- | o ' ” 
tion 61 05 58 
‘ o 7 " Po. و‎ o 1 " 
Differences ہے‎ BS .35 sodas daa 67 12 50 83 26 30 
Half diff. or angles e Lr T dms 
of deflection 26.36 106. E 33 36 25 41 43 15 
o 7 “ o 2 “ ° , “ 
Sum of means 1231 41.00 —. |...--- 121 33 50 121 29 30 
TETTEN, o D da 5 7 " o ç ایب‎ 
` Half sum 一 dip 60 60 رر رر یں‎ 60 46 55 60 44 45 
