268 
GENERAL SIR EDWARD SABINE ON TERRESTRIAL MAGNETISM. 
immediately following that epech). We may infer, consequently, that the annual decrease 
of the Declination was somewhat greater in the south-east of England, than it was at the 
same period in Scotland : and we find it stated by Dr. Lloyd, in vol. i. page 80 of the 
Magnetical Observations at Trinity College in Dublin, that in the years 1840 to 1843 
the rate of decrease in Dublin was about 6 f *i). 
In conformity with these premises, the secular change of the Declination, at the 
Epoch of 1842*5 to which the observations of the British Survey are referred, has been 
assumed to have been an annual decrease of West Declination of approximately 5'*6 
in Scotland and the north of England, increasing to 6'*2 in the middle and southern 
part of England, and to 6'-9 in Ireland. 
B. Inclination . — In Scotland and the adjacent islands the survey supplies seventeen 
stations at which observations of the Inclination were made at intervals of nineteen 
years and upwards. They are brought together in the following Table. 
Station. 
Lat. N. 
Long. E. 
Lerwick 
6o 09' 
358 53 
Kirkwall 
59 00 
357 02 
Wick 
58 24 
356 55 
Golspie 
57 58 
356 03 
Inverness 
57 28 
355 49 
Melrose 
55 35 
357 16 
Berwick 
55 45 
358 00 
Alford 
57 13 
357 15 
Fort Augustus . 
57 08 
355 20 
Edinburgh 
55 57 
356 49 
Gretna 
55 01 
356 56 
Braemar 
57 01 
356 35 
Jordanhill 
55 54 
355 39 
Campbelton ... 
55 23 
354 22 
Helensburgh ... 
56 00 
355 19 
Cum bray 
55 48 
355 08 
Glasgow 
55 51 
355 46 
Observer. 
{ Sabine. 
Ross. 
Welsh, 
r Ross, 
j Welsh. 
J Ross, 
j Welsh. 
( Sabine. 
Ross. 
Welsh. 
{ Sabine. 
Ross. 
Welsh. 
( Sabine. 
Fox. 
Welsh. 
Ross. 
Welsh. 
Sabine. 
Welsh. 
Sabine. 
Welsh. 
Sabine. 
Fox. 
Welsh. 
Fox. 
Welsh. 
Sabine. 
Welsh. 
Sabine. 
Sabine. 
Sabine. 
Welsh. 
Sabine. 
Welsh. 
Sabine. 
Welsh. 
( Sal)ine. 
Fox. 
Welsh. 
Date. 
Inclination 
observed. 
Interval. 
1818-5 
1838-5 
1858-5 
1838-5 
1 858*5 
1838*5 
1858-5 
1836-5 
1838-5 
1858*5 
1836-5 
1838*5 
1857-5 
1836-5 
1837*5 
1857-5 
1838-5 
1857-5 
1836-5 
1857-5 
1836-5 
1857-5 
1836- 5 
1837*5 
1857*5 
1837- 5 
1857*5 
1836-5 
1857-5 
1838*5 
1853-5 
1836-5 
1857-5 
1836-5 
1857-5 
1836-5 
1 857"5 
1836- 5 
1837- 5 
1857*5 
Annual 
secular 
decrease. 
71 31 
7 2 14 
71 30 
71 56 
71 14 
72 17 
71 30 
72 01 
71 29 
72 02 
72 05 
71 26 
21 
20 
20-5 
21 
20*5 
1-85 | 
1*60 J 
1-90 
1-95 
|l-62 
1- 90 
2- 07 
2*47 
1*71 
1-76 
1- 92 
2- 15 
2-05 
2*10 
2-00 
2-24 
1-52 
1-83 
1*72 
