nn وو‎ 
y” 
MAGNETIC OBSERVATIONS. 115 
OBSERVATIONS—Continued. 
Station, Camp 81, Colorado Chiquito ; latitude 35° 01' 21”. 03; longitude Th. 21m. 58. 81s. 
Needle, B. Date, December 8, 1853. Hour of beginning, 1h. 15m. p. m. ; hour of ending, 1h. 40m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
° , , 
1 40 43 
Needle vertical, face of circle north, reading of azimuth circle 40 38 
40 30 
40 53 
Needle vertical, face of circle south, reading of azimuth circle 40 43 
40 46 
Reading of azimuth circle when plane of instrument is in the magnetic meridian 40 42 ۰ 
Reading of azimuth circle when plane of instrument is in the true meridian 54 03 01 
Approximate magnetic declination 13 20 51E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Def. with wt. 2 gr. Def. with wt. 23 gr. 
Face of circle. Direct. 
Def. towards | Def. from the Ther. | D rds | Def. from the| Ther. 
the vertical. | vertical. Fah. | the vertical.|  vertica Fah. 
(2) (1) 
, ہے‎ wee Gre? o or GEES o 
61 35 87 45 85 27 55 94 40 28 10 55 
East .... 61 33 87 37 327899 a E 94 50 AO "AN ee 
61 30 87 35 | 5 20 erue 94 43 28 ۷۰ هه‎ sa 
| | | 
61 33 pe | a 20 20 94 40 CS Lo 
West 61 30 87 40 | i. are ee 94 45 25  - بش بت‎ 
61 30 87 32 35 20 | 55 94 37 28 07 55 
| | 
o , " ° , ۶ o o 7 " 
(1)87 37 30 (1) 94 42 30 } 
— aone | (2) 35 20 E (2) 28 09 20 SE 
Corr. for index error of needle..| 十 8 48 
o , "m 
Deduced inclination ..........- 61 40 38 
: ° , ” o 7 7 
Differences 52 A O di 有 
2 " , ” ° 7 7 
Half diff. or angles of deflection 20 07 906. — fess- 93 16 3. ieee 
o , " [e] , " 
Sum of means I o M  |......- 122 51 5 — ica coos 
o , " o , " 
Half sum — dip ie ہہ‎ 3 oL... 61 26 55  |........ 
