128 
MAGNETIC OBSERVATIONS. 
OBSERVATIONS—Continued. 
Station, Camp 108, Williams’ river ; latitude 35° 06' 31".3; longitude 7A. 32m. 50.75s. 
Needle, B. Date, January 28, 1854. Hour of beginning, 1 h. 30m. p. m.; hour of ending, 1/t. 50m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o i ' n 
l 60 59 
Needle vertical, face of circle north, reading of azimuth circle...2 60 50 
( 60 56 
( 60 62 
Needle vertical, face of circle south, reading of azimuth circle.2 60 50 
( 60 55 
Reading of azimuth circle when plane of instrument is in the magnetic meridian...60 55 20 
Reading of azimuth circle when plane of instrument is in the true meridian. 74 35 36 
Approximate magnetic declination. 13 40 16 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 ) 
Tlier. 
Fall. 
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 ' 
61 10 
61 08 
61 10 
61 07 
61 10 
61 05 
o / 
87 58 
87 62 
67 
87 
87 
87 
50 
62 
87 58 
o ' 
34 07 
34 05 
34 08 
34 05 
34 00 
34 10 
72 
68 
o II 
95 35 
95 20 
95 30 
95 25 
95 45 
95 25 
o a 
26 43 
26 45 
26 40 
26 45 
26 40 
26 45 
103 45 
103 35 
103 45 
103 15 
103 20 
103 25 
18 20 
18 18 
18 25 
18 20 
18 15 
18 15 
Means . 
o ' " 
61 08 20 
(1) 87 59 30 
(2) 34 05 50 
o 
70 
( (1) 95 30 00 ) 
1 (2) 26 43 00 f 
j (1) 103 30 50 ) 
j (2) 18 18 50 j 
Cor. for index er¬ 
ror of needle_ 
Deduced inclina¬ 
tion . 
-f 8 48 
o i /• 
61 17 08 
Differences. 
53 53 40 
68 47 00 
85 12 00 
Half.diff. or angles 
of deflection 
o 
26 
56 50 
34 23 30 
42 36 00 
Sum of means . 
122 05 
20 
122 13 00 
121 49 40 
Half sum = dip 
61 02 40 
61 06 30 
60 54 50 
Note.— For the remaining magnetic observations at Camp 108, see page 116. 
