MAGNETIC OBSERVATIONS. 
129 
OBSERVATION'S—Continued. 
Station, Camp 109, Branch of While Cliff Creek ; latitude 35° 12' 2G". 50; longitude 1h. 33 in. 25.45 s. 
Needle, B. Date, Januai~y 30, 1854. Hour of beginning, 4 h. 45m. p. m. ; hour of ending, 5/i. p. m. 
Obsei-ver, 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_______ 
0 
/ 
13 
40 
13 
38 
13 
45 
13 
41 
13 
45 
13 
43 
13 
42 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Face of circle. 
West 
Means. 
Cor. for index error of needle_ 
Deduced inclination 
Differences 
Half diff. or angles of deflection 
Sum of means. 
Half sum = dip. 
Direct. 
Def. with wt. 2 gr. 
Def. with wt. 21 gr. 
Def. towards 
the vertical. 
(1) 
Def. from the 
vertical. 
(2) 
Ther. 
Fall. 
Def. towards 
the vertical. 
(1) 
Def. from the 
vertical. 
(2) 
Ther. 
Fall 
o / 
61 10 
61 10 
61 08 
61 00 
61 00 
61 05 
o / 
87 30 
87 30 
87 25 
87 20 
87 15 
87 20 
o / 
34 45 
34 55 
34 48 
34 45 
34 48 
34 55 
o 
54 
o / 
94 10 
94 18 
94 12 
94 15 
94 25 
94 10 
.o ' 
27 33 
27 30 
27 30 
27 28 
27 30 
27 25 
o 
54 
54 
54 
o / // 
61 05 30 
O / n 
j (1) 87 23 20 ) 
j (2) 34 49 20 j 
o 
54 
O 1 // 
j ( 1 ) 94 15 00 ) 
( (2) 27 29 20 j 
o 
54 
/ // 
4- 8 48 
o / " 
52 34 00 
o / // 
66 45 40 
o ' n 
61 14 18 
o / // 
26 17 00 
o / // 
33 22 50 
o / // 
122 12 40 
0/1/ 
121 44 20 
o / /' 
61 06 20 
O / !/ 
60 52 10 
IT m 
Night cloudy ; no observations for decimation. 
