MAGNETICAL OBSERVATIONS IN IRELAND. 
157 
Place. 
(zo a 2 ) 
(w a b ) 
(w b 2 ) 
(to a <?)* 
(w b c)* 
Carn . 
1156 
- 3876 
12996 
41870 
-6270 
Strabane. ... 
1764 
— 3696 
7744 
42268 
—4752 
Enniskillen. 
2304 
— 2880 
3600 
42592 
-3240 
Armagh . 
392 
— 1680 
7200 
41008 
-4320 
Carlingford. 
9 
+ 123 
1681 
- 72 
— 986 
Tulla . 
7744 
+ 2464 
784 
4 1584 
4 504 
Limerick. 
36125 
+ 17425 
8405 
42125 
41025 
Killarney. 
14641 
4- 9438 
6084 
4 786 
4- 507 
Fermoy . 
7396 
4 - 6880 
6400 
-1548 
— 1440 
Glengariff . 
15129 
4-11931 
9409 
4 430 
4 339 
Adding, we have, 
S (w or) = 86660, S (w a h) = 4 36129, S (w b 2 ) = 64303, 
8 (w a c) = + 11043, S (w h c) = — 18633. 
The final equations accordingly are 
86660 x + 36129 y = + 11043 
36129 x 4 64303 y - - 18633 5 
from which we deduce 
x = + *3228 = s cos v, 
y — — *4/05 = s sin v ; 
in which v denotes the angle which the isoclinal line makes 
with the meridian of Dublin, and s the coefficient which deter¬ 
mines the rate of increase of the dip in the perpendicular di¬ 
rection. Dividing, and squaring and adding, we find 
tan v = — 1*458, v — — 55° 33 f , 
.9= - 571 . 
The following are the results of calculation for the year 
1835 : 
* The values of <$ — or c, are only taken to the nearest minute. 
