TERRESTRIAL MAGNETISM AT KEW OBSERVATORY. 
Ill 
figure for 1892 ought really to be less than that for 1896, and whether the 
character figure of 1895 should be the largest of all, are results more open to doubt. 
The mean of the absolute daily ranges in 1892 and 1894, whether in H or D, decidedly 
exceeded that of any other year; hut this was at least partly due to the incidence in 
these two years of an altogether outstanding proportion of the largest magnetic storms 
of the 11 years. 
The H and D figures in Table XV. place the 11 years in exactly the same order as 
regards amplitude of range. In 1891, 1893, 1895, 1896, and 1897, the ratio borne by 
the mean D range to the mean H range lies between 1'19 and 1'22. The extreme 
values of the ratio are 1’08 in 1894 and 1'31 in 1900. 
§ 29. Table XVI. distributes the total number of days of character “ 0,” “ 1,” and “ 2 ” 
under the twelve months to which they belong, and gives the corresponding mean 
value of the character figure. It also gives for comparison the corresponding mean 
absolute daily ranges in H and D, the latter expressed in terms of force as in the 
previous table. 
Table XVI.—-Results for the 12 Months. Totals and Means (11 Years 
1890 to 1900). 
Month. 
Number of days of character. 
Mean 
character 
figure. 
Absolute daily range 
(unit ly). 
0. 
1. 
2. 
H. 
D. 
January .... 
151 
150 
40 
0-67 
46-5 
59-4 
February .... 
109 
145 
56 
0-83 
00-1 
72-8 
March. 
113 
163 
65 
0-86 
66-7 
84-7 
April. 
133 
157 
40 
0-72 
07-6 
79-8 
May. 
150 
155 
36 
0-67 
68-8 
79-3 
June. 
154 
148 
28 
0-62 
66-9 
72-6 
July. 
159 
144 
38 
0-64 
70-6 
75-2 
August .... 
151 
166 
24 
0-63 
68-0 
75-7 ' 
September . . . 
129 
161 
40 
0-73 
66-4 
77-5 
October .... 
124 
165 
52 
0-79 
59-7 
74-9 
November . . . 
155 
141 
34 
0-63 
47-6 
62-3 
December . . . 
171 
140 
30 
0-59 
39-8 
52-1 
( 
The more or less disturbed character of a month may be regarded as indicated either 
by the mean value of the character figure, or by the fewness of the days of character 
“ 0 ” as compared to the total. On either criterion, March was the most disturbed 
month, followed at no great interval by February and October. March was also the 
month of largest D range, but the H range in March was slightly exceeded in each of 
the five months April to August. 
December had the fewest days of disturbance, the smallest mean magnetic character, 
