FROM ORDINARY DAYS OF THE ELEVEN YEARS 1890 TO 1900. 
243 
Table XXI. — Horizontal Force. (Unit ly.) 
Ci. 
c 2 . 
C B- 
Ci. 
Month. 
& 
mini¬ 
mum. 
11 
years. 
S._ 
maxi¬ 
mum. 
S \ 
mini¬ 
mum. 
11 
years. 
S. 
maxi¬ 
mum. 
s. 
mini¬ 
mum. 
11 
years. 
S. 
maxi¬ 
mum. 
S. 
mini¬ 
mum. 
11 
years. 
S. 
maxi¬ 
mum. 
January . . . 
1-23 
3-15 
5-41 
1-80 
3-41 
4-46 
2-27 
2-26 
2-52 
1-16 
1-29 
1-33 
February. . . 
2-93 
4-50 
6-33 
2-46 
3-54 
5-02 
2-45 
2-68 
3-14 
1-31 
1-26 
1-18 
March .... 
6-55 
9-13 
11-78 
4-31 
5-66 
7-46 
3-39 
3-75 
4-53 
1-44 
1-63 
1-88 
April. 
10-27 
14-43 
18-44 
5-37 
7-55 
9-20 
3-17 
3-61 
4-17 
1-32 
1-65 
2-09 
May. 
12-21 
15-83 
19-14 
4-94 
6-44 
8-11 
1-32 
1-25 
1-57 
0-86 
1-04 
1-18 
June. 
13-18 
17-18 
21-56 
5-58 
7-06 
9-26 
1-85 
1-73 
2'45 
0-88 
0-71 
0-96 
July. 
12-94 
17-17 
21-86 
4-83 
7-06 
9-10 
2-36 
2-01 
1-99 
0-95 
0-73 
0-88 
August. . . . 
12-41 
15-97 
19-70 
4-74 
6-35 
7-90 
3-12 
3-18 
3-44 
1-40 
1-43 
1-32 
September . . 
10-60 
13-17 
15-31 
5-05 
5-71 
6-33 
3-63 
3-84 
3-96 
1-84 
1-88 
1-97 
October . . . 
8-03 
10-89 
13-88 
4-88 
6-14 
8-02 
2 • 72 
3-66 
4-30 
1-13 
1-62 
1-91 
November . . 
3-05 
5-20 
7-98 
3-72 
4-54 
5-68 
1-85 
2-21 
2-61 
0-92 
1-13 
1-18 
December . . 
2-66 
3-30 
4-73 
2-59 
3-32 
4-25 
1-53 
1-62 
2-07 
0-67 
0-57 
0-46 
Arithmetic 1 
means . J 
8-01 
10-83 
13-84 
4-19 
5-56 
7-07 
2-47 
2-65 
3-06 
1-16 
1-25 
1-36 
In the case of and c 2 , whether in Table XXI. or Table XXIII., there is no single 
month in which the amplitude fails to show an increase as we pass from the sunspot 
minimum to the sunspot maximum group of years. In the case of c 3 and c 4 the same 
is generally true, but there are a few exceptions, presumably accidental in both 
tables. 
Table XXII.—Horizontal Force. Phase Angles referred to Local Mean Time. 
“i- 
Clo. 
«3 
a i- 
Month. 
s. 
mini¬ 
mum. 
11 
s. 
maxi¬ 
mum. 
s. 
mini¬ 
mum. 
11 
s. 
maxi¬ 
mum. 
s. 
mini¬ 
mum. 
11 
s. 
maxi¬ 
mum. 
s. 
mini¬ 
mum. 
11 
s. 
maxi¬ 
mum. 
years. 
years. 
years. 
years. 
o 
/ 
O / 
0 t 
o 
/ 
° 
/ 
o 
/ 
o 
o 
o 
0 
O 
0 
J J anuary. 
-24 
24 
51 43 
67 12 
298 
41 
282 
8 
279 
30 
167 -5 
157 
9 
152 
•1 
8 
5 
3 
5 
-2-7 
j February. 
69 
21 
70 49 
77 46 
2S0 
32 
269 
56 
271 
57 
146 -7 
146 
3 
141 
'2 
-9 
4 
-5 
2 
5 9 
March.. 
103 
28 
101 8 
102 29 
297 
55 
294 
15 
295 
28 
154 -0 
153 
5 
153 
•6 
0 
4 
-1 
4 
-6-2 
| April. 
115 
32 
114 51 
115 30 
299 
0 
297 
51 
297 45 
145 '3 
150 
i 
152 
•3 
13 
1 
20 
4 
20 '3 
, May. 
132 
15 
131 27 
130 17 
317 
28 
307 
52 
302 
44 
217 -0 
204 
5 
198 
'5 
59 
9 
67 
0 
63 3 
| June . 
131 
37 
134 43 
136 25 
306 
54 
308 
24 
312 
5 
200 '8 
213 
3 
216 
•0 
37 
0 
53 
3 
67 '2 
i July . 
134 
16 
134 5 
134 20 
321 
2 
310 
37 
307 
59 
204 -5 
191 
9 
179 
■9 
42 
1 
30 
1 
30 -8 
j August. 
129 
21 
127 58 
126 44 
338 
46 
327 
27 
322 
17 
212 -4 
203 
8 
197 
•8 
32 
2 
33 
9 
24 7 
September .... 
116 
18 
113 58 
111 58 
320 
32 
320 
48 
318 
10 
187 -8 
1S8 
3 
183 
'7 
34 
6 
33 
5 
38 -0 
October ..... 
94 47 
94 30 
93 43 
294 
57 
295 
57 
297 
8 
162 '8 
162 
9 
160 
•8 
25 
4 
21 
3 
16-2 | 
November .... 
80 37 
76 20 
77 37 
289 
21 
282 
28 
279 
45 
158 -9 
153 
9 
149 
•1 
40 
7 
24 
0 
6'8 
December .... 
13 
50 
37 45 
54 31 
280 
16 
268 
59 
265 
50 
145 -6 
141 
8 
134 
•2 
34 
3 
15 
8 
4'4 
The annual variation in the amplitude is clearly shown in all cases, but it follows 
different laws in the different waves. Ci and c 2 in both H and have a well marked 
VOL. CCXVI.-A. 2 L 
