MAGNETIC OBSERVATIONS, 
151 
OBSERVATIONS—Continued. 
Station, Camp 141, Sand Camp ; latitude 350 05' 36''. 25 ; longitude 7 h. 43 m. 03. 13s. 
Needle, B. Bate, March 7, 1854. Hour of beginning, 4 h. 30m. p. m. ; hour of ending, bh. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
( 74 52 
Needle vertical, face of circle north, reading of azimuth circle..< 74 55 
( 74 55 
C 74 50 
Needle vertical, face of circle south, reading of azimuth circle....\ 74 57 
( 74 53 
Reading of azimuth circle when plane of instrument is in the magnetic meridian.. 74 53 40 
Reading of azimuth circle when plane of instrument is in the true meridian.. 
Approximate magnetic declination..... 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
Direct. 
o " 
60 38 
East.-( | 60 42 
60 42 
60 40 
West.-J 60 42 
60 38 
Of " 
Means. 60 40 20 
Def. with wt. 21 gr. 
Def. towards 
the vertical. 
( 1 ) 
o ' 
94 30 
94 28 
94 35 
94 40 
94 38 
94 35 
Def. from the 
vertical. 
( 2 ) 
Ther. 
Fah. 
o 
26 33 
26 38 
26 33 
o 
58 
26 38 
26 40 
26 38 1 58 
Def. with wt. 3 gr. 
( (1) 94 34 20 
1 (2) 26 36 40 
Cor. for index error of needle —|— 8 48 
58 
Def. towards 
the vertical. 
( 1 ) 
o ' 
102 30 
102 35 
102 30 
102 30 
102 30 
102 33 
Def. from the 
vertical. 
( 2 ) 
18 18 
18 16 
18 22 
18 15 
18 20 
18 18 
j (1) 102 31 20 
] (2) 18 18 10 
Ther. 
Fah. 
o 
60 
60 
o 
60 
Deduced inclination__ 60 49 08 
Differences 
Half. diff. or angles of deflection. 
Sum of means.. 
Half sum = dip. 
67 57 40 
33 58 50 
121 11 00 
60 35 30 
84 13 10 
42 06 35 
120 49 30 
60 
24 45 
Night cloudy ; no observation for declination. 
