SURVEY OP BELGIUM IN 1871. 
353 
use of the magnetograms of Stonyhurst Observatory, as no continuous records have as 
yet been obtained in Belgium of the magnetic elements. The differences between the 
ordinates of the curve at the absolute times of observation, and the mean ordinate for 
July, August, September, and October, multiplied into 28' 38 ,,- 9, the scale-coefficient of 
the Declination Magnetograph, give a close approximation to the correction required 
for reducing the results to September 1st for Stonyhurst. To apply these to observa- 
tions made in Belgium I have introduced the factor 0'G9, as I find from the mean values 
obtained at the Brussels Observatory for 9 a.m., noon, 3 p.m., and 9 p.m., compared with 
those deduced at Stonyhurst for the same hours, that the movements are in the ratio of 
0*69 to 1. This will of course give only a first approximation, but the data will scarcely 
admit of greater exactness. 
Table XV. 
Station. 
Azimuth of Sun. 
Observed 
W. Declination. 
Declination corrected 
for Range and 
Disturbance. 
O / // 
O / n 
O / n 
Antwerp 
48 9 412 
17 30 41 7 
17 33 16 
17 30 2 2 2 
17 31 33 
Brussels Observatory 
IS 3 49 5 
17 59 52 
18 4 46-0 
18 1 0 
Brussels, 131 rue Royale 
76 2 47-7 
1 7 8 0-4 
17 12 45 
1 7 8 0-4 
17 12 57 
Louvain 
47 49 41-1 
If] 4 H 15 3 
16 50 12 
16 47 27" 1 
16 51 48 
16 49 49-9 
16 55 10 
Turnhout 
22 4 5 1 
17 13 137 
17 5 32 
17 11 23-3 
17 3 5 
Liege 
54 6 53-1 
16 16 12-0 
16 16 0 
16 17 3-9 
16 17 16 
Aix-la-Chapelle 
72 21 10 3 
16 30 51 2 
16 28 29 
16 32 28-5 
16 30 19 
16 34 38-3 
16 32 39 
Spa 
17 5 47'9 
16 43 44-9 
16 39 59 
16 44 10 9 
16 40 25 
Arlon 
45 8 52-S 
16 29 35 -4 
16 23 51 
1(1 32 11-2 
16 26 51 
16 33 42 0 
If) 28 
Namur 
10 10 14-0 
17 40 36 0 
17 34 52 
17 40 55 0 
17 34 59 
Mons 
72 7 29 5 
17 21 24-7 
17 13 43 
17 22 36-1 
37 15 41 
17 23 2 0 
17 16 42 
i Tournay ... 
49 15 37 1 
17 50 1 4 2 
17 43 43 
17 49 54-8 
17 43 59 
Courtray 
IS 47 53 8 
17 54 32-8 
17 47 14 
1 
17 54 52-3 
17 48 9 
Ghent 
1 1 1 26-5 
17 59 4-3 
17 54 8 
17 58 5-9 
17 52 46 
17 59 3-5 
17 49 58 
17 59 32’5 
17 50 4 
Ostend 
56 45 19 0 
18 6 57 6 
18 7 34 
18 7 36-5 
18 8 35 
Bruges 
54 43 41-9 
18 1 115 
17 58 25 
18 1 180 
17 58 32 
Troncliiennes 
55 47 49-1 
17 55 41 5 
1 ^ «jo 5o 
17 56 38-6 
2 1 Ut) 5o 
17 55 20-7 
17 52 47 
Alost 
51 54 M 
17 25 51-8 
17 23 53 
17 25 6 4 
17 22 44 
17 24 34 0 
17 22 35 
Brussels, 131 rue Royale 
39 40 30-1 
17 25 33-8 
17 23 0 
17 25 33-8 
17 23 12 
Brussels Observatory 
39 25 24-6 
17 52 30-3 
17 54 5 
17 54 40-1 
17 56 15 
n »> 
16 25 10 1 
18 3 46-9 
18 3 47 
18 5 30 8 
18 5 31 
