Weft from Paris, } Eaft from Paris 
the 'Trigonometrical Operation. 
ZZ<) 
Comparative table of the old and new longitudes of fome noted places 
on the lkirts of the kingdom of France. 
Places. 
Latitudes. 
Longitudes, 
1 
DifF. of old and new long. « 
Old 
New. 
in deg s &c. 
in time. 
O 
$ 
✓ 
// 
0 
/ 
// 
0 
/ 
// 
/ 
// 
Sec. 
Thirds. 
Wilier de Cette 
43 
24 
6 
I 
21 
7 
I 
20 
37 
O 
23 
I 
32 
Tour de Planier, near Marfeilles 
43 
1 1 
58 
2 
54 
8 
2 
53 
6 
I 
2 
4 
8 
Signal of St. Vi£toire 
43 
3 i 
52 
3 
i 5 
8 
3 
l 3 
58 
I 
10 
4 
40 
i Strafbourg (Conn, de T. 1788) 
4 b 
34 
35 
5 
26 
18 
> 
24 
6 
2 
12 
8 
48 
j Ditto (Defcrip. Geomet. 1783, 
48 
L p. 1 7 1 • 
34 
5 ° 
5 
25 
0 
r* 
3 
2 3 
33 
I 
27 
5 
48 
Tour de Cordouan at the mouth of 
the Garonne, Conn, de T. 1788 
45 
35 
15 
3 
30 
38 
3 
29 
18 
I 
20 
5 
20 
.J St. Malo .... 
43 
39 
0 
4 
22 
22 
4 
20 
37 
I 
45 
7 
0 
Fort du Pilier, at the mouth of the 
Loire .... 
4 7 
2 
29 
4 
42 
20 
4 
40 
3 ° 
I 
50 
7 
20 
^Ulhant Light-houfe 
48 
28 
3 ° 
7 
24 
33 
7 
21 
4 1 
2 
52 
1 1 
28 
The greateft difference between Strafbourg and Uftiant 
The leaft difference . 
The mean difference 
• 
• 
• 
5 
4 
4 
4 
J 9 
4*2 
20 16 
17 36 
18 46 
With regard to the longitudes in the preceding table, it is 
only neceffary to obferve, that the two books of 1744 and 
1783, fo often quoted, are not always confident with each 
other, and both do fometimes difagree with what has been 
placed on the margin of the map of France. It would feem, 
that in the Defcription Geometrique a fcale for degrees of lon- 
gitude has been ufed confiderably greater than that correfpond- 
ing with the fpherical hypothefis adhered to in the conftruc- 
tion of the map, yet dill too fmall for what we have found 
to be their meafure in Kent, or that refulting from their own 
operations in the South of France. But if a fimilar mode to 
that which they pradtifed with lo much fuccefs in the South 
had- 
