Table XII.—.Rates of Secular Change per Annum in the Declination, Inclination, and Horizontal Foi'ce, in terms of 
Minutes of Arc for the Declination and Dip, and of Metric Units for the Horizontal Force. 
(N.B.—The two former elements are diminishing, the Horizontal Force is increasing.) 
SURVEY OE THE BRITISH ISLES FOR THE EPOCH JANUARY I, 1886, 
325 
Longitude. 
p4 
0 
8100- 
f-9 
6-1 
1-5 
•0018 
5^9 
1^6 
•0018 
o 
6-5 
1-4 
■0019 
6-2 
1-5 
•0019 
6100- 
9-T 
1-9 
o 
o 
6-8 
1-3 
•0018 
6100- 
f-l 
9-9 
C5 
At »—I 
cb Ag 
6-2 
1-6 
•0019 
1° w. 
8T 
0-9 
•0014 
6-9 ' 
1-4 
■0018 
O 
00 lO 03 
6-5 
1-6 
•0019 
6-4 
1-7 
•0019 
o 
8-3 
0-9 
•0015 
9100- 
O-I 
1-8 
05 r-H t—1 
A 44 g 
00 
f—1 
A r-l g 
CO 
At) (tl r—1 
A A g 
05 
CO CO I—1 
A A g 
7-1 
1-4 
•0019 
o 
C5 At 03 
cb A g 
6-7 
1-6 
•0020 
6-5 
17 
•0020 
0-3 
1-8 
•0021 
cc 
8-4 
0-9 
•0015 
8-3 
1-0 
•0016 
8-0 
11 
•0017 
7-9 
1-2 
•0018 
7-6 
1-3 
•0018 
7-5 
1-4 
•0019 
7-2 
1-4 
•0019 
o 
r-l lO OJ 
A g 
o 
00 O OJ 
cb A g 
6-7 
1-7 
•0020 
6-4 
1-8 
•0021 
4° W. 
8-6 
1-0 
•0015 
8-4 
1-0 
•0016 
f-H T—1 
00 A g 
8-0 
1-2 
•0018 
7-8 
1-3 
•0018 
05 
CO ^ r-i 
^-A§ 
7-4 
1-5 
•0019 
7-2 
16 
■0020 
o 
O 04 
AAg 
O 
CO 00 03 
cb^g 
6-6 
1-9 
•0021 
0 
iO 
8-6 
11 
•0017 
8-3 
1-2 
•0018 
8-2 
•0019 
7-9 
1-3 
•0019 
7-7 
1-4 
•0020 
O 
At At 
A A g 
7-4 
1-6 
•0021 
t—1 
r-H 03 
AAg 
rH 
p OO 03 
AAg 
6-7 
1-9 
•0022 
o 
O 
8-7 
1-1 
•0017 
8-5 
1-2 
•0018 
8-3 
1-3 
•0019 
8-1 
1-4 
•0019 
7-9 
1-5 
•0020 
o 
At O'! 
A A g 
At O 03 
A A g 
p !>• 03 
AAg 
T* ^ 
TT* i-H 
7° W. 
Cv r—1 r—( 
do g 
00 
0-1 ^ 
do rL g 
8-5 
1-3 
•0019 
8-2 
1-4 
•0019 
8-1 
1-5 
•0020 
7-8 
1-6 
•0020 
rH 
17^ 03 
AAg 
7-4 
1-8 
■0021 
GO 
CO 
O rH 
05 L g 
8-8 
1-3 
•0019 
O 
CO rlH OI 
do A g 
O 
Tp t<I 
do A g 
rM At 
do A g 
p p Ol 
00 § 
03 
CO 0-3 
AAg 
03 
CO CO 03 
AAg 
o 
8-4 
1-6 
•0021 
8-1 
1-6 
■0021 
8^0 
T7 
•0022 
C<l 
17^ CO OJ 
AAg 
i 
10° w. 
CO I> 03 
do A g 
8-1 
1^8 
■00-22 
03 
C5 05 03 
AAg 
Latitude. 
O 
O 
o 
lO 
CO 
o 
O 
At) 
to 
At 
o 
if 
At 
At 
53° 
o 
nH 
At) 
50° 
