MAGNETIC OBSERVATIONS. 143 
OBSERV ATIONS— Continued. 
Station, Camp 129, Rio Colorado; latitude 340 27' 26", 44 ; longitude Th. 36m. 45. 24s. 
Needle, B. Date, February 22, 1854. Hour of beginning, bh. p. m.; hour of ending, 5h. 30m. p.m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o , ” 
š í 66 45 
Needle vertical, face of circle north, reading of azimuth circle 66 51 
| 66 60 
66 52 
Needle vertical, face of circle south, reading of azimnth circle 66 52 
66 42 
Kis of azimuth circle when plane of instrument is in the ti idi 66 50 20 
Reading of azimuth circle when plane of instrument is in the bës meridian , 
| Approximate magnetic declination 
E us I ESL Lente ER 
1 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
E Def. with wt. 2} gr. | Def. with wt. 3 gr. 
Face of circle. Direct. | | 
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 y ° , 0 r | [e] | [e] f 0 4 o 
60 25 94 25 26 08 | 5 1* 103-40 17 60 65 
East. 60 28 94 30 E. مه تسا‎ 102 35 Ho ces 
60 25 94 28 26 10 |........| 102 48 Et و‎ tos مر مر‎ 
60 25 94 20 "SHE ED leo; سک ند‎ 102 40 M O88 kaos os 
West 60 27 94 25 "i و‎ 00 | 102 45 Hm 9۰ ی تیا‎ 
60 25 94 20 926 58 | 65 | 102 50 17 40 65 
| | 
O , " " | [e] | 0 f " o 
M " (1) 94 ر404‎ |f Q0) 102 43 0 | | 
pn 602550 || G) 26 sl 50 | e | (2 17 53 30 بی‎ 
Cor. forindex errror of needle..| + 8 48 | | 
[e] , ” | | 
Deduced inclination _...... ---- 60 34 38 | 
6 e " | | o , ” 
Differences ee ee | aw گہشیئ‎ 28 
| | 
| | 
[o] ” | o D " 
Half diff. or angles of deflection.|...........- 33 56 25 | -------- | 42 24 50 |-------- 
| l 
[e] Li " | | o , " 
Sum of means 120 58.30 . |-.---.| 120 86.40 . ho. 
š 0 , ۱ m | [e] , " 
Half sum — dir | ; 60 28 15 60 18 20  ]....-... 
degrees firs& recorded in the — note-book were “ E After- 
believed that the original record was DW VW. 
wards they were 
ét 269". 4 
۶ For these three observations the number of 
changed to 
It is 
