136 
MAGNETIC OBSERVATIONS. 
OBSERVATIONS—Continued. 
Station, Camp 121, Williams’ River ; latitude 340 16’ 51". 10 ; longitude Th. 33m. 44.83s. 
Needle, B. Date, February 13, 1854. Hour of beginning, 3h. 30m. p. m. ; hour of ending, 4h. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
Needle vertical, face of circle north,reading of azimuth circle 
Needle vertical, face of circle south, reading of azimuth circle 
Reading of azimuth circle when plane of instrument is in the 
Reading of azimuth circle when plane of instrument is in the tn 
Approximate magnetic declination 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Def. with wt. 2 gr. 
Def. with wt. 23 gr. 
Def. with wt. 3 gr. 
Face of circle, Direct. 
Def. towards | Def. from the | Ther. | Def. towards | Def. from the | Def. towards | Def. from the 
the vertical. vertical. Fah. | the vertical. vertical. the vertical. vertical. 
(1) (2) (1) (2) (1) (2) 
Qs $ Goat Oa? ° KEEN, o p ° / ین‎ ra 
60 15 86 50 33:80 63 94 15 25 60 102 15 17 50 
East. 60 15 86 48 کات کی‎ EE OE 94 20 25 60 102 25 17 48 
60 22 86 45 SE s lo u s 94 08 25 52 102 15 17 50 
ç 60 15 86 40 ا ہے 1 25 کا‎ 94 05 25 58 102 20 17 45 
West 60 15 86 50 کچ‎ T. . 94 05 25 60 102 18 17 40 
(| 60 12 86 45 33 63 94 15 25 60 102 10 17 50 
0 , " [e] , Léi 0 D ” 0 1 “ 
۳ ۱ (1) 86 46 20 (94 11 20 (1) 102 17 10 | 
asas m i (2) 33 26 20 63 (2) 25 58 20 (2) 7 10 
Corr. for index er- 0 
ror of needle ...| + 8 8 
Deduced inclina- | © ' ^" ۱ 
tion 60 24 28 
° , ” ° , ” ° 4 a 
Differences MM C38 جو‎ SE 68 113 0 84 30 00 
Half diff. or angles o d " o , " Gg 
of deflection — Met. NOU 2127ء‎ 34 ::06 ` 30 42 15 00 
0 , " o , ” ° 7 “ 
Sum of means . tot: وات‎ l... 120 09 40 120 04 20 
ES 
o , " o , " o 1 y 
(lk dp... 7578 60 06 as ) ۶ 60 04 50 60 02 10 
— 
