OF TERRESTRIAL MAGNETIC FORCE IN THE HORIZONTAL PLANE. 
685 
Greenwich expressed as factors of the Mean Horizontal Magnetic Force. 
Mean Daily Range of Horizontal Force in the Direction Transversal to the Astronomical Meridian. 
In Gottingen Mean Solar 
In Gottingen Mean Solar 
Time. 
Time. 
Range of 
transversal 
Approximate Hour of 
Range of 
Approximate Hour of 
Month. 
Month. 
transversal 
Force. 
Maximum 
Maximum 
Force. 
Maximum 
Maximum 
Easterly 
Westerly 
Easterly 
Westerly 
Force. 
Force. 
Force. 
Force. 
h. m. 
h. 
m. 
h. 
m. 
h. m. 
June. . . 
•0036 
20 0 
2 
0 
July . . . 
•0027 
20 0 
3 
0 
December . . | 
•0016 
10 
0 
2 0 
January . . 
•0019 
12 
0 
1 50 
June . . . 
•0026 
20 10 
3 
0 
July . . . 
•0029 
20 10 
2 
10 
December . . 
•0016 
10 
0 
2 0 
January . . 
•0018 
12 
0 
2 0 
June. . . 
•0035 
20 30 
2 
10 
July . . . 
•0036 
20 20 
2 
30 
December . . 
•0014 
10 
0 
2 0 
January . . 
•0016 
14 
0 
1 50 
June. . . 
•0033 
20 0 
2 
15 
July . . . 
•0029 
20 0 
2 
0 
December . . 
•0014 
12 
0 
2 10 
January . . 
•0020 
14 
0 
1 50 
June. . . 
•0032 
20 0 
2 
20 
July . . . 
•0036 
20 0 
2 
40 
December . . 
•0015 
10 
0 
2 0 
January . . 
•0018 
10 
20 
1 50 
June. . . 
•0038 
20 0 
2 
10 
July . . . 
•0038 
20 20 
3 
0 
December . . 
•0015 
12 
0 
2 0 
January . . 
Obser 
vations 
inter 
rupted. 
June. . . 
•0034 
19 50 
3 
30 
July . . . 
■0038 
19 30 
2 
20 
December . . 
■0026 
14 
0 
2 0 
January . . 
•0028 
10 
0 
2 20 
June. . . 
•0037 
20 30 
2 
10 
July . . . 
•0041 
20 50 
2 
20 
December . . 
•0019 
13 
20 
2 0 
January . . 
•0022 
. 11 
0 
2 0 
June . . . 
•0041 
20 0 
3 
0 
July . . . 
•0039 
20 20 
2 
40 
December . . 
•0015 
12 
0 
1 30 
January . . 
•0022 
10 
40 
2 30 
June. . . 
•0034 
20 0 
2 
0 
July. . . 
•0034 
20 30 
! 2 
0 
December . . 
•0012 
9 
0 
1 0 
January . . 
•0015 
10 
0 
2 
1 June . . . 
•0027 
20 20 
2 
50 
July . . . 
*0029 
20 40 
2 
10 
December . . 
0017 
9 
40 
1 0 
January . . 
•0015 
11 
0 
2 0 
June. . . 
•0028 
21 0 
2 
0 
July . . . 
•0022 
21 0 
2 
10 
December . . 
•0015 
9 
40 
2 10 
Year. 
• 1841 
-1842 
■1843 
>1844 
>1845 
• 1846 
>1847 
J-1848 
j>1849 
>1850 
>1851 
•1852 
Greenwich Mean Solar Time for the same instant. 
MDCCCLXXXV, 
4 T 
