o A 9 
THE REV. STEPHEN J. PERRY ON THE MAGNETIC 
Table I. 
Station. 
Latitude. 
Longitude. 
Difference 
in miles of 
Place of observation. 
Lat. 
Long. 
Aix-la Chapelle 
50 46 0 
m s 
6 51 
- 60 
+75-1 
18 Aurelius Strasse. 
| Alost 
50 56 18 
1 19 
+ 5-9 
— 14-4 
Garden of the College. 
Antwerp 
51 13 15 
0 8 
+25-4 
+ 1-4 
Courte rue Neuve. 
! Arlon 
49 41 0 
5 39 
-80-8 
Rue du Luxembourg 46. 
Bruges 
51 12 30 
4 35 
+24-6 
-49-8 
Rue Flamande 60. 
Brussels 
50 51 11 
0 0 
0-0 
00 
Royal Observatory, 131 rue Royale. 
Courtray 
50 49 0 
4 21 
— 2 5 
-47-6 
Garden near Church of St. Michael. 
Ghent 
51 3 12 
2 34 
+ 13-8 
-28-0 
Rue d’Assaut 26. 
! Liege 
50 39 0 
4 51 
- 14 0 
+53-4 
College St. Servais. 
Lierre. . .- 
517 0 
0 47 
+ 18-2 
+ 8-5 
Vineyard close by Parish Church. 
Louvain 
50 53 27 
1 19 
+ 26 
+ 14-3 
Rue des Recollets 11. 
Mechlin 
51 1 45 
0 26 
+ 12-2 
+ 4-7 
Boulevards des Arbaletriers 83. 
’ Mons 
50 27 0 
1 41 
-27-9 
-18-6 
College St. Stanislas. 
Namur 
50 28 2 
1 56 
- 2 ( 5-7 
+21-3 
College N. D. de la Paix. 
OstencI 
51 13 47 
5 48 
+26-0 
— 630 
Garden near the Church. 
Spa 
50 29 0 
5 55 
-25 5 
+ 65-2 
Rue de Wauxhall 43. 
Tournay 
50 36 22 
3 55 
-17-1 
-43-1 
College Notre Dame. 
Tronchiennes 
51 3 12 
2 49 
+ 13-8 
-30-8 
Ancienue Abbaye. 
Turnhout 
51 19 0 
2 11 
+32-1 
+23-7 
College St. Joseph. 
i Verviers 
50 36 0 
5 55 
— 17-5 
+651 
College St. Francois Xavier. 
A comparison of the large atlases of Ferraris, Philip, and the Useful Knowledge 
Society have supplied the required data for the above geographical latitudes and longi- 
tudes, whenever these could not be obtained directly from the ‘ Connaissance des Temps.’ 
The Magnetic Tip. 
As this element has been observed almost invariably with each of the three needles 
employed throughout the survey, any very accurate comparison of the readings obtained 
with the several needles is thus rendered unnecessary. It may suffice to remark that 
needles Nos. 2 & 3 give mean results which are scarcely perceptibly at variance, whilst 
the readings of No. 1 are about l'*5 in excess of the mean of the other two. 
Table II. 
Station. 
Date. 
G.M.T. 
Dip. 
Needle No. 1. 
Needle No. 2. 
Needle No. 3. 
Mean. 
1871. 
h m 
! Antwerp 
Aug. 5 
9 5 A.M. 
67 4 29 
o / // 
10 50 „ 
67 0 8 
/It 
3 15 p.m. 
66 59 19 
67 1 19 
1 Brussels, 131 rue Royale 
„ 8 
10 15 A.M. 
67 5 57 
3 15 r.M. 
67 12 34 
4 50 
67 8 50 
67 9 7 
! Brussels Observatory 
„ 9 
10 50 A.M. 
66 56 34 
12 15 r.M. 
67 1 34 
66 59 4 
Louvain 
„ U 
10 10 a.m. 
66 58 12 
2 55 p.m. 
66 54 11 
4 55 
66 53 38 
66 55 12 
Mechlin 
„ 14 
8 10 A.M. 
66 47 39 
9 55 „ 
66 44 8 
Lierre 
„ 14 
4 0 r.M. 
66 59 30 
„ 15 
8 5 A.M. 
66 54 47 
67 0 19 
66 58 12 
Turnhout 
„ 16 
10 20 „ 
67 10 6 
4 15 p.m. 
67 6 2 
5 44 „ 
67 7 56 
67 8 1 
