BRITISH ISLES FOR THE EPOCH JANUARY 1, 1916. 
15 
Table II.—Horizontal Force. 
Station. 
No. 
Date. 
Horizontal 
Force 
observed. 
Greenwich 
value. 
Differ¬ 
ence. 
Add 
18,505. 
Provisional 
value for 
epoch Jan. 
1, 1915. 
Moment 
of 
magnet 
at 0° C. 
Cambridge.... 
67 
1913. 
Nov. 10 
18,162 
18,505 
- 343 
18,162 
768-3 
67 
„ 28 
18,188 
18,518 
- 330 
— 
18,175 
761-1 
67 
Dec. 2 
18,168 
18,527 
- 359 
— 
18,146 
760-1 
67 
„ 3 
18,161 
18,518 
- 357 
— 
18,148 
760-1 
j, .... 
67 
„ 8 
18,174 
18,516 
- 342 
— 
18,163 
760-5 
Greenwich .... 
G. 
1914. 
Jan. 14 
18,575 
18,548 
4- 27 
18,532 
760-3 
M .... 
„ 15 
18,560 
18,553 
+ 7 
— 
18,512 
760-4 
Chichester .... 
72 
Mar. 24 
18,836 
18,541 
-h 295 
— 
18,800 
760-4 
Salisbury .... 
136 
„ 26 
18,638 
18,536 
+ 102 
— 
18,607 
760-3 
Southampton . . 
O.S. 
„ 28 
18,704 
18,513 
+ 191 
— 
18,696 
760-0 
Alresford .... 
58 
„ 31 
18,721 
18,540 
+ 181 
— 
18,686 
759-9 
Weymouth . . . 
151 
April 3 
18,815 
18,513 
+ 302 
— 
18,807 
760-7 
Taunton .... 
145 
,, 6 
18,577 
18,507 
+ 70 
— 
18,575 
760-6 
St. Cyres .... 
134 
„ 7 
18,686 
18,534 
4- 152 
— 
18,657 
759-9 
Plymouth .... 
124 
„ 8 
18,811 
18,527 
4- 284 
— 
18,789 
760-2 
Falmouth .... 
80 
„ 9 
18,832 
18,523 
4- 309 
— 
18,814 
760-2 
Bude . . • . . 
66 
„ 11 
18,517 
18,509 
4- 8 
— 
18,513 
760-4 
Clovelly .... 
75 
„ 15 
18,461 
18,515 
- 54 
— 
18,451 
760-7 
Ilfracombe .... 
93 
„ 16 
18,390 
18,501 
- Ill 
— 
18,394 
760-5 
Clifton. 
74 
„ 18 
18,426 
18,512 
- 86 
— 
18,419 
760-4 
Cardiff. 
68 
21 
)? -j 1 
18,409 
18,518 
- 109 
— 
18,396 
759 - 6 
Brecon . 
65 
„ 22 
18,143 
18,532 
- 389 
— 
18,116 
760-0 
Gloucester .... 
83 
„ 24 
18,210 
18,515 
- 305 
— 
18,200 
759-5 
Swindon .... 
144 
„ 25 
18,384 
18,511 
- 127 
— 
18,378 
760-3 
Wallingford . 
150 
„ 27 
18,432 
18,519 
- 87 
— 
18,418 
759-1 
Reading .... 
131 
„ 29 
18,504 
18,520 
- 16 
— 
18,489 
759-7 
Haslemere .... 
89 
„ 30 
18,692 
18,525 
4- 167 
— 
18,672 
759-5 
Ryde. 
133 
May 1 
18,794 
18,497 
4- 297 
— 
18,802 
759-2 
Horsham .... 
91 
„ 5 
18,739 
18,524 
4- 215 
-- 
18,720 
759-4 
Worthing .... 
156 
„ 6 
18,835 
18,531 
4- 304 
— 
18,809 
759-4 
St. Leonards . 
135 
„ 7 
18,846 
18,539 
4- 307 
— 
18,812 
759-2 
Dover. 
79 
» 8 
18,771 
18,536 
4- 235 
— 
18,740 
759-5 
Tunbridge Wells. 
149 
,, 11 
18,765 
18,564 
4- 201 
— 
18,706 
759-2 
Ranmore .... 
130 
12 
18,705 
18,516 
4- 189 
— 
18,694 
759-1 
Windsor .... 
154 
„ 13 
18,479 
18,508 
- 29 
— 
18,476 
759-4 
Greenwich .... 
G. 
» 14 
18,565 
18,553 
4- 12 
— 
18,517 
759-2 
Purfleet .... 
127 
„ 15 
18,563 
18,565 
_ 2 
— 
18,503 
758-3 
Southend .... 
139 
„ 16 
18,535 
18,541 
8 
— 
18,497 
759-7 
Braintree .... 
64 
„ 18 
18,373 
18,530 
- 157 
— 
18,348 
757-6 
Colchester .... 
77 
„ 19 
18,404 
18,515 
- Ill 
— 
18,394 
759-2 
Harwich .... 
87 
„ 21 
18,391 
18,547 
- 156 
-- 
18,349 
757-9 
Lowestoft .... 
no 
„ 22 
18,198 
18,537 . 
- 339 
— 
18,166 
758-7 
Thetford .... 
146 
„ 23 
18,169 
18,566 
- 397 
— 
18,108 
758-6 
Cambridge. 
67 
„ 25 
18,176 
18,514 
- 338 
— 
18,167 
758-7 
Harpenden . . . 
88 
„ 26 
18,391 
18,561 
- 170 
— 
18,335 
758-7 
Kew. 
99 
» 27 
18,484 
18,506 
- 22 
— 
18,483 
758-7 
Oxford. 
122 
„ 28 
18,241 
18,489 
- 248 
— 
18,257 
758-8 
Bedford. 
61 
„ 29 
18,100 
18,529 
- 429 
— 
18,076 
758-4 
Peterborough. . . 
123 
„ 30 
1 18,087 
i 
18,539 
- 442 
— 
18,063 
758-3 
