138 
MAGNETIC OBSERVATIONS. 
OBSERVATIONS—Continued. 
Station, Camp 122, Williams’ River; latitude 34° 12' 32”. 40; longitude 7 h. 34 m. 12. 19s. 
Needle, B. Date, February 15, 1854. Hour of beginning, bh. p. m. ; hour of ending, bh. 20 m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
o t a 
( 64 06 
Needle vertical, face of circle north, reading of azimuth circle...1 64 06 
l 64 08 
( 64 04 
Needle vertical, face of circle south, reading of azimuth circle....I 64 00 
( 64 05 
Reading of azimuth circle when plane of instrument is in the magnetic meridian. 64 04 50 
Reading of azimuth circle when plane of instrument is in the true meridian... 77 45 31 
Approximate magnetic declination........ 13 40 41 E. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
East 
West 
Means 
Corr. for index error of needle . - 
Deduced inclination 
Differences 
Half diff. or angles of deflection 
Sum of means 
Direct. 
Def. with wt. 21 gr. 
Def. with wt. 3 gr. 
Def. towards 
the vertical. 
(1) 
Def. from the 
vertical. 
(2) 
Ther. 
Fah. 
Def. towards 
the vertical. 
(1) 
Def. from the 
vertical. 
(2) 
Ther. 
Fah. 
O ' 
59 58 
59 58 
59 60 
59 60 
59 58 
59 60 
O ' 
93 58 
93 60 
93 55 
93 60 
93 58 
93 58 
O ' 
25 58 
25 60 
25 60 
25 55 
25 60 
25 50 
o 
56 
O ' 
102 20 
102 20 
102 30 
102 20 
102 15 
102 15 
O ' 
17 45 
17 50 
17 50 
17 45 
17 45 
17 40 
o 
56 
56 
56 
O ' n 
59 59 00 
O l " 
j (1) 93 58 10 ) 
| (2) 25 57 10 \ 
o 
56 
O ' " 
j (1) 102 20 00 ) 
{ (2) 17 45 50 j 
o 
56 
+ 8 48 
O / " 
68 01 00 
o ' " 
84 34 10 
O ' " 
60 07 48 
O ' " 
34 00 30 
O ' " 
42 17 05 
O ' " 
119 55 20 
O ' " 
120 05 50 
O ' " 
59 57 40 
O ' " 
60 02 55 
Half sum dip 
