MAGNETIC OBSERVATIONS. 133 
OBSERVATIONS—Continued. 
Station, Camp 116, Williams’ River ; latitude 34° 35’ 36". 90 ; longitude Th. 33m. 51.17s. 
Needle, B. Date, February 8, 1854. Hour of beginning, 4h. 30m. p. m. ; hour of ending, 5h. p. m. 
` Observer, Lieut. J. C. Ives, Topographical Engineers. 
o " 
[ 71 55 
Needle vertical, face of circle north, reading of azimuth circle | 71 55 
71 55 
[ 71 7 
| Needle vertical, face of circle south, reading of azimuth circle ] 71 50 
71 57 
Reading of azimuth circle when plane of instrument is in the ü idi 71 54 50 
Réading of azimuth circle when plane of instrument is in the We meridian 85 56 59 
| Approximate magnetic declination 14 02 09 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY— No. 4. 
۱ 
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) 
y | 
we Ew c ° RS E ° P 6 4 
60 30 87 15 83 20 67 94 35 26 15 102 50 | 17 45 
Dna a 60 23 87 15 BA Lies 94 50 26 20 102 45 17 50 
60 30 87 15 UBI MEE 94 45 | 26 12 102 45 17 40 
60 25 87 15 حا یج‎ 94 45 | 26 00 102 45 17 30 
BRL doe 60 35 87 20 ES 3 Desen 94 45 26 20 | 102 45 17 30 
60 20 87 08 33 20 | 67 94 30 26 15 | 102 50 17 43 
| 
” e] 7 ” | 0 Di ° , ” 
1 87 14 40 | (1) 94 41 40 } (1) 102 46 40 } 
Means ے۔‎ ------| 60 27 10 j ۳ 33 26 40 1 | ۳ d (2) 26 13 40 (2 17 40 00 
4 Cor. for index er- EE 
ror of needle...| 十 8 48 
Deduced inclina- | O ' ” 
tion 60 35 58 
[o] 7 ” 0 7 ” o ' “ 
Differences 53 48 d co 68 28 00 85 06 40 
Half diff. or angles ptm ë — s. w 8 
of Zeene 26 54 00 موی‎ 34 14 00 42 33 20 
| 
O 7 ” | 0 , " 0 , “ 
Sum of means 120 ^41 20 | S 120 55 20 120 26 40 
| o 7 ^ | 0 H ۲ “ o H " 
Half sum — dip 60 20 40 | یچ ا‎ st جو‎ 60 13 20 
