MAGNETIC OBSERVATIONS. 
159 
OBSERVATIONS—Continued. 
Station, Ommbridge Observatory ; latitude 42° 22' 48"; longitude ih. 44m. 29. 6s. 
Needle, A. Date, May 10, 1854. Hour of beginning, 1/j. 20m p. m. ; hour of ending l/i. 50m. p.m. 
Observers, Prof. W. C. Bond and Lieut. J. C. Ives. 
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 
/ n 
14 
52 
14 
50 
14 
45 
14 
52 
14 
50 
14 
60 
14 
51 30 
5 
04 
9 47 30 W. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 3. 
Face of circle. 
East. 
West. 
Means. 
Cor. for index error of needle. 
Deduced inclination... 
Diff. of means. 
Half diff. or angles of deflection. 
Sum of means.. 
Direct. 
Def. towards 
the vertical. 
o 
, 
o 
/ 
74 
35 
107 
30 
74 
35 
107 
30 
74 
30 
107 
28 
74 
30 
107 
25 
74 
28 
107 
32 
74 
25 
107 
30 
o / '/ 
74 30 30 
4- 15 04 
O III 
74 45 34 
Def. S. at app. dip. 
Def. from the 
vertical. 
o ' 
41 05 
41 10 
41 12 
41 15 
41 25 
41 20 72 
Ther. 
Fall. 
o 
72 
o 
107 
41 
29 
14 
10 
30 
o 
72 
66 14 40 
33 07 50 
148 43 40 
74 21 50 
Def. N. at app. dip. 
Def. towards 
the vertical. 
o ' 
103 45 
103 43 
103 40 
103 30 
103 40 
103 38 
Def. from the 
vertical. 
o " 
44 55 
44 58 
44 55 
44 50 
44 55 
44 50 
o 
103 
44 
39 20 
53 50 
58 45 30 
29 22 45 
148 33 10 
74 16 35 
Ther. 
Fah. 
72 
72 
72 
Half sum — dip 
