MAGNETIC OBSERVATIONS, 
133 
OBSERVATIONS—Continued. 
Slaticm, Camp 116, Williams' River; latitude 34° 35' 36". 90; longitude 7 h. 33 m. 51.17s. 
Needle, B. Date, February 8, 1854. Hour of beginning, 4 h. 30m. p. m. ; hour of ending, 5 h. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o • » 
j 71 55 
Needle vertical, face of circle north, reading of azimuth circle....7 71 55 
( 71 55 
( 71 57 
Needle vertical, face of circle south, reading of azimuth circle_____7 71 50 
( 71 57 
Reading of azimuth circle when plane of instrument is in the magnetic meridian... 71 54 50 
Reading of azimuth circle when plane of instrument is in the true meridian.. 85 56 59 
Approximate magnetic declination. 14 02 09 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
Direct. 
Def. with wt. 2 gr. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
( 2 ) 
Ther. 
Fah. 
Def with wt. 2£ gr. 
Def. towards 
the vertical. 
( 1 ) 
Def. from 
the vertical. 
(2) 
Def. with wt. 3 gr. 
Def. towards 
the vertical. 
(1) 
Def. from 
the vertical. 
(2) 
East.. 
West. 
o ' 
60 30 
60 23 
60 30 
60 25 
60 35 
60 20 
Means. 
o ' " 
60 27 10 
Cor. for index er¬ 
ror of needle -- 
Deduced inclina¬ 
tion...... _ 
i n 
+ 8 48 
o < " 
60 35 58 
Differences. 
Half diff. or angles 
of deflection.... 
Sum of means. 
87 15 
87 15 
87 15 
87 15 
87 20 
87 08 
o ' 
33 20 
33 30 
33 40 
& 20 
W 30 
33 20 
o 
67 
67 
94 35 
94 50 
94 45 
94 45 
94 45 
94 30 
o ' 
26 15 
26 20 
26 12 
26 00 
26 20 
26 15 
o / 
102 50 
102 45 
i02 45 
102 45 
102 45 
102 50 
o / 
17 45 
17 50 
17 40 
17 30 
17 30 
17 45 
j (1) 87 14 40 } 
j (2) 33 26 40 j 
o 
67 
j (1) 94 41 40 ) 
j (2) 26 13 40 f 
j (1) 102 46 40 l 
l (2) 17 40 00 j 
53 48 00 
o 
26 
54 
00 
120 41 
20 
60 20 40 
o 
68 
28 
00 
85 06 40 
o 
34 
14 
00 
42 33 20 
o 
120 
20 
o i >i 
120 26 40 
60 27 40 
60 13 20 
Half sum = dip. 
