IN THE MEAN EFFECTS OF THE LARGER MAGNETIC DISTURBANCES. 109 
3 to 6 p.M. inclusive. On the whole, the average magnitude of a disturbance is 
greatest at both stations from 5 to 7 a.m. 
The preponderance of easterly or westerly aggregate values at the different hours, 
shows the direction in which the magnet was deflected by the disturbances at the 
respective hours from the position in which it would have been found had they not 
occurred ; and the ratio of preponderance shows the relative magnitude of the 
deflection. If we take the aggregate values of the westerly disturbances at Toronto 
and of the easterly at Hobarton at the different hours as the respective units at 
those hours, and compute the ratios which the easterly at Toronto and westerly at 
Hobarton at the same hours bear to them respectively, we obtain, as in the follow- 
ing Table, the ratios which at Toronto the aggregate values of the easterly disturb- 
ances bear to the westerly, and at Hobarton the westerly to the easterly, at the different 
hours of the day and night. When the ratios at Toronto are below unity, the mean 
deflection of the north end of the magnet at that hour is to the west, and when above 
unity, to the east. At Hobarton, the ratios which are less than unity indicate easterly 
deflections, and when above unity, westerly deflections. 
Table VII. 
Hours of local 
astronomical 
time. 
Toronto. 
Ratios of easterly 
aggregate values 
to westerly. 
Hobarton. 
Ratios of westerly 
aggregate values 
to easterly. 
Hours of local 
astronomical 
time. 
Toronto. 
Ratios of easterly 
aggregate values 
to westerly. 
Hobarton. 
Ratios of westerly 
aggregate values 
to easterly. 
h 
h 
18 
0-52 
0-fil 
6 
1-75 
0-86 
19 
0‘32 
0-48 
7 
2-64 
2-32 
20 
0-38 
0-61 
8 
3-93 
4-59 
21 
0-36 
0-54 
9 
5-96 
7-87 
22 
0-52 
0-60 
10 
4-18 
9-77 
23 
0-72 
0-69 
11 
3-71 
4-33 
0 
O’o8 
0-79 
12 
2-24 
4-58 
1 
0*76 
0-71 
13 
1-67 
4-83 
2 
0-61 
0-75 
14 
1-38 
3-35 
3 
0-49 
0'55 
15 
1-36 
2-07 
4 
0-66 
0-56 
16 
M8 
1-09 
5 
0*78 
0-55 
17 
0-75 
0-75 
We have in this Table unmistakeable evidence of a variation, depending on the 
hour of local time, in the magnetic direction occasioned by the disturbances, and of 
a correspondence in the phenomena at the two stations indicative of a common law. 
During the hours of the day, or from 5 a.m. to 5 p.m. at Toronto and Hobarton, the 
deflection of the north end of the magnet occasioned by the disturbances is to the 
west at Toronto, and to the east at Hobarton. A little before 6 p.m. at Toronto, and 
a little after 6 p.m. at Hobarton, the deflections at both stations pass through zero, 
(or the undisturbed position of the magnet,) into deflections of the opposite cha- 
racter, becoming easterly at Toronto, and westerly at Hobarton. The magnitude of 
those deflections rapidly augments to a maximum, which is reached at Toronto at 
9 P.M., and at Hobarton an hour later, from which hour it progressively diminishes 
