the Trigonometrical Operation. 3 g 5 
to makft any alteration whatever on account of that difference 
(except as will be mentioned underneath), but to proceed 
with our own fcale of drftances for fixing the relative fituation 
of Dunkirk ; making ufe, neverthelefs, in the firft feven fol- 
lowing triangles, from the XXXVIth to the XLIJd inclufive 
of the angles as ultimately fettled by the late French opera- 
tions, which Comte ns Cassini has been fo obliging as to fun- 
ply us with for that purpofe. The angles of the XLIIId and 
XLIVth triangles are taken from M. Cassini de Thhry’s 
Book (La Meridienne verifee ) ; and thofe of the XLVth tri- 
angle refult from the combined operation. 
In conformity with the exception above alluded to, we have, 
in the XXXVIth triangle, added 3" to our angle obferved at Do- 
ver between Elancnez and the fleche of the fpire of Notre Dame 
at Calais ; that is to fay, inftead of 12° 46'' 39" it has been made 
12° 46' 42", on a fuppofition, that the fpire may overhang fo 
much from the perpendicular towards Blancnez : becaufe the 
fpace between the pofition of the white light on the gallery, 
and' the axis of the fpire, being carefully meafured by Dr. 
Blagden, correfponds to an angle of 9", whereas the obfer- 
vation gave only a difference of 6 ". 
N° of 
triangles. 
Names of the ilations. 
Angles cor- 
rected for 
calculation. 
D iH:ac ces. 
( 
1 
1 
XXXVI. 
N.D, at Calais , , . 
Slancnez iignal „ . 
Dover Caftle . e 1 2° 46' 39" 
>t t> a. /■> 1 • c 1 Dover Caftle , 
N.D. at Calais from i _ . 
1 Elancnez iignal 
Excefs above i8o°“0 // .S4. 
0 / // 
47 27 & 
IT 9 46 12 
12 46 42 
Feet. 
r 57449-9 ! 
35 0 23-3 1 
N° 
