SURVEY OF BELGIUM IN 1871. 
351 
For the comparisons at the Brussels Observatory I am indebted to the kindness of 
M. E. Quetelet. 
It was not possible to compare the chronometer oftener ; but this is less to be regretted, 
as the behaviour of the instrument during the French surveys showed that it is not 
liable to any great change of rate whilst travelling, if carried always with care. As it 
was previously found that the rate of the chronometer could be more securely trusted 
than the deduced rates from observed altitudes of the sun, the latter were not observed 
in Belgium. 
Table XIV. 
Station. 
Date. 
Chronometer. 
Error at 
Noon. 
Daily 
Bate. 
Azimuthal 
distance of sun 
from mark. 
Azimuthal 
reading of 
magnet. 
Azimuthal 
reading of 
mark. 
1871. 
h m s 
m s 
s 
Antwerp 
Aug. 5 
10 2 14-5 a.m. 
+29 0-49 
+3-39 
44 47 30 
10 18 4 1 
39 52 15 
10 42 9 
244 54 37 0 
10 49 5 
244 54 56-5 
256 35 30 
Brussels Observatory . . . 
„ 9 
4 3 30 p.m. 
29 14 04 
4 20 
Brussels, 131 rue Koyale 
„ 10 
8 14 42-8 a.m. 
29 1802 
+4-245 
47 34 0 
8 22 0-9 
45 59 30 
9 25 
171 19 42-35 
9 30 
171 19 42-35 
159 11 40 
Louvain 
11 
10 1 57-1 
29 22-26 
53 36 0 
10 11 23-6 
50 42 45 
8 44 0 
199 10 10-0 
8 49 30 
199 8 58-2 
8 56 30 
199 6 35-4 
220 16 6-7 
Turnkout 
16 
10 56 31 -4 
29 43-49 
145 43 45 
11 9 14-3 
150 18 30 
11 28 52 8 
157 38 45 
11 34 39 8 
159 52 10 
12 10 5 p.m. 
117 1 33 9 
12 16 47-5 
117 3 24-3 
Liege 
„ 24 
2 50 44-1 
30 17-45 
104 17 45 
4 37 29-5 
163 20 59 £» 
4 44 51-5 
163 20 8 0 
129 26 20 
1 Aix-la-Chapelle 
„ 26 
3 56 18-9 
30 25-94 
24 36 45 
4 7 31 5 
27 5 0 
4 15 37 9 
28 50 0 
4 50 45 
219 25 3-5 
4 58 15 
219 23 26-2 
5 6 30 
219 21 16-4 
101 26 30 
Spa 
„ 29 
30 38-67 
66 1 30 
11 21 46 4 
67 56 45 
11 27 46-3 
70 6 30 
1 1 49 30 
192 44 23 
11 55 0 
192 43 57 
124 20 45 
Avion 
„ 31 
2 14 19 0 p.m 
30 47 16 
91 14 45 
2 19 41-5 
92 48 30 
2 25 4-3 
94 20 30 
3 9 30 
230 54 23-6 
3 16 30 
230 51 47-8 
3 22 30 
230 50 17 0 
199 45 15 
Namur 
Sept. 2 
11 37 161 a.m 
30 55-65 
60 42 30 
11 43 55 5 
63 6 30 
11 48 42 1 
64 50 30 
11 7 51 
235 51 13 
11 12 0 
235 50 54 
180 28 25 
Mons 
„ 4 
4 12 5-8 p m. 
31 4-14 
187 55 15 
4 17 55-6 
189 1! 30 
4 24 23- 1 
190 34 30 
4 31 10-8 
192 0 0 
4 56 0 
268 5S 4-8 
5 1 0 
268 56 53-4 
5 6 0 
268 56 27 5 
163 31 40 
