94 
MAGNETIC OBSERVATIONS. 
OBSERVATIONS—Continued. 
Station, Camp 65, Hay Camp ; latitude 35° 4' 59". 69; longitude 7 h. 10 m. 36.8s. 
Needle, B. Date, November 15, 1853. Hour of beginning , Hi. p. m.; hour of ending, 4A. 45m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. 
Needle vertical, face of circle north, reading of azimuth circle.... 
Needle vertical, face of circle south, reading of azimuth circle.. 
Reading of azimuth circle when plane of instrument is in the magnetic meridian 
Reading of azimuth circle when plane of instrument is in the true meridian- 
Approximate magnetic declination--- 
o 
7 34 
7 40 
7 39 
7 41 
7 11 
7 36 
7 33 
43 29 
35 56 
30 
39 
09 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 
Direct. 
o ' 
35 35 
35 33 
35 30 
35 28 
35 26 
35 30 
Def. with wt. 2 gr. 
Def. towards 
the vertical. 
(1) 
Def. from the 
vertical. 
( 2 ) 
o ' 
63 10 
63 15 
63 08 
63 30 
63 20 
63 28 
o ' 
7 25 
7 20 
7 28 
7 00 
7 05 
7 08 
Ther. 
Fall. 
o 
65 
Def. with wt. 21 gr. 
Def. towards 
the vertical. 
( 1 ) 
Def. from the 
vertical. 
( 2 ) 
65 
35 30 20 
-f 8 48 
35 39 08 
Sum of means . 
Half sum = dip 
c 
, 
„ 
o 
O ' " 
S (1) 
63 
18 
30 ) 
65 
\ (1) 
71 32 30 ) 
1 (2) 
7 
14 
20 j 
1 (2) 
32 50 j 
56 04 10 
28 02 05 
70 32 50 
35 16 25 
o ' 
71 30 
71 25 
71 30 
71 33 
71 37 
71 40 
30 
33 
28 
35 
33 
38 
70 59 40 
35 29 50 
72 05 20 
36 02 40 
Ther. 
Fah. 
o 
65 
65 
Instrument-stand rested upon a bed of lava during these observations. 
J. C. I. 
