140  MAGNETIC OBSERVATIONS. 
OBSERV ATIONS-— Continued. 
^ Station, mouth of Williams’ River ; latitude 340 17' 46". 58 ; longitude Th. 36m. 00s. 
Needle, B. Date, February 20, 1854. Hour of beginning, 11h. 20m.a.m.; hour of ending, 12h. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o , Hi 
79 46 3 
Needle vertical, face of circle north, reading of azimuth circle 79 47 
79 47 
T9 15 
Needle vertical, face of circle south, reading of azimuth circle j 19.46 
79 52 
Reading of azimuth circle when plane of instrument is in the ti idi 79:57. -00 
Reading of azimuth circle when plane of instrument is in the ie meridian 
Approximate magnetic declination 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Def. with wt. 23 gr. Def. with wt. 5 gr 
3 f circle. irect. š 
"mE جح‎ | Def towards] Def from | Ther. (Def towards |. Def from | Ther. 
the vertical. | the vertical. | Fah. | the vertical. | the vertical. | Fah. 
(1) (2) (1) (2) 
o , o , ° , 0 , [e] H o 
60 00 94 12 25 50 TT 102 20 17 30 TT 
East 60 05 94 10 25.300. F. ام موہ‎ 102 28 Io eee 
60 03 94 10 جو ھت اھت 5و‎ 102 25 17 90. .|-.-.- Sue 
60 03 94 03 2 M. eL 102 25 10 20. E 
West 60 04 94 02 85 AS ایا‎ 102 15 17 - 2 ۰ Lose 
60 00 94 10 25 55 TT 102 20 17 22 71 
1 8 7 ” ° , ” o oO , " 0 
(1) 94 07 50 (1 102 21 40 
Means 000230 || G 25 51 20 T (2) 17 24 30 éi 
Cor. for index error of needle...| 十 8 48 
@ =e ” 
60 11 18 
Deduced inclination...........- 
[e] , " , " 
Differences. 68 I8 30 ی‎ 8۸ te 
۱ 0 , " 0 , " 
Half diff. or angles of deflecti 54 384 dB. سس یت‎ 42 28.35 Ge E 
[o] , Hi , Di 
Sum of means H9 189 +67 119 46 10 
° 1 ° D n 
Half sum 一 dip eo on, 95 ہیر ات"‎ 69 53 05 J |.------- 
