270 
DR. C. CHREE: DISCUSSION OF KEW MAGNETIC DATA 
February 14, 1892, as the trace then went beyond the limit of registration, and the 
range measured to the edge of the sheet was 1° 19'. Ii we accept the value on 
March 15, 1898, as the true maximum, we find maximum range/minimum range 
= 102'9 in H, as compared with 3 9’4 in D. 
§ 29. Tables XLVIII. to LIII. deal with the frequency of occurrence of ranges 
of different size for D, H, and V. There are two tables for each element, the one 
showing the distribution for each of the 11 years, the other the distribution for each 
of the 12 months. To make the D results comparable with those for the force 
Table XLVIII.—Declination Ranges (Unit ly). Number of Occurrences. 
Year. 
From 0 
To 12-5 
12-5 
25 
25 
37-5 
37-5 
50 
50 
62-5 
62-5 
75 
75 
100 
100 
125 
125 
150 
150 
175 
175 
200 
200 
250 
250 
500 
500 
1890 
0 
4 
55 
96 
96 
68 
30 
11 
4 
1 
0 
0 
0 
o ; 
1891 
0 
13 
27 
35 
78 
75 
80 
37 
8 
5 
4 
2 
1 
0 
1892 
0 
1 
9 
28 
49 
70 
115 
39 
18 
12 
9 
8 
8 
0 
1893 
0 
3 
13 
26 
33 
61 
156 
47 
15 
8 
2 
0 
1 
0 
1894 
0 
2 
10 
36 
41 
92 
107 
36 
15 
4 
7 
3 
12 
0 
1895 
0 
6 
18 
27 
49 
70 
112 
41 
19 
16 
7 
0 
0 
0 
1896 
0 
8 
26 
36 
65 
82 
75 
36 
18 
11 
3 
5 
1 
0 
1897 
1 
15 
37 
57 
93 
74 
45 
31 
6 
2 
1 
1 
2 
0 
1898 
0 
17 
39 
52 
102 
66 
52 
22 
8 
2 
9 
jj 
0 
3 
0 
1899 
0 
26 
38 
70 
93 
64 
50 
12 
3 
5 
2 
9 
0 
0 
1900 
1 
49 
49 
96 
102 
45 
14 
3 
3 
3 
0 
0 
0 
0 
elements, the same force limits are employed for the several classes. It was not 
necessary to convert individual D ranges into their equivalents in force, but only to 
find what were the angles corresponding to the several force limits, employing the 
relation between 1' and ly appropriate to the particular year. 
Table XLIX.—Declination Ranges (Unit ly). Number of Occurrences in 
Eleven Years. 
Month. 
F rom 0 
To 12-5 
12-5 
25 
25 
37 • 5 
37-5 
50 
to o 
o< 
62-5 
75 
75 
100 
100 
125 
125 
150 
January. . . 
0 
38 
67 
74 
51 
30 
37 
23 
10 
February . . 
0 
21 
43 
52 
44 
42 
54 
26 
9 
March. . . . 
0 
1 
11 
39 
71 
68 
67 
36 
24 
April .... 
0 
0 
0 
25 
74 
85 
90 
32 
12 
May. 
0 
0 
6 
40 
61 
82 
97 
29 
14 
June .... 
0 
0 
' ' 2 
35 
88 
89 
84 
23 
9 
July. 
0 
0 
2 
32 
96 
97 
80 
19 
3 
August . . . 
0 
0 
1 
19 
86 
93 
110 
24 
4 
September . 
0 
0 
8 
36 
81 
70 
87 
23 
11 
October. . . 
0 
1 
21 
69 
66 
43 
68 
45 
13 
November . 
1 
30 
64 
• 70 
50 
40 
32 
16 
8 
December. . 
1 
1 
53 
96 
68 
33 
28 
30 
19 
7 
6 
7 
14 
5 
4 
4 
4 
2 
3 
8 
10 
9 
175 2001250 
200 250 500 
0 3 
2 I 3 
0 
0 
7 
7 
6 
1 
1 
5 
6 
1 
2 
0 
3 
2 
3 
0 
2 
3 
500 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 i 
0 
0 
