the Trigonometrical Operation. 2 :y 
hurft, or the point R, is lefs removed from the earth’s axis 
than it would be on the former figure ; and confequently it is 
probable, that the fpheroid is lefs oblate. 
From the preceding determinations it is further evident, that 
fuppofing the latitudes of B and G, with the horizontal an- 
gles PPG and PGB to be given by obfervation, not only the 
difference of longitude, or the angle BPG, will be obtained, 
but alfo the arc BR. of the meridian, the arc RG of a great 
circle perpendicular to it, and the oblique arc BG, all con ft- 
dered as arcs of great circles of the fpheroid. 
Art. X. Further illujlratlon of the manner of fettling the lati- 
tudes and longHjtdes of the fations comprehended in the general 
table of refults . 
Having ftiewn, in the preceding part of this fedlion, how 
the length of the degree cf a great circle, perpendicular to the 
meridian, and alfo the differences of latitude and longitude, 
have been obtained by very accurate obfervations of the pole- 
ftar made at certain ftations to the eaftward of Greenwich, 
whereby we have been furnifhed with a fcale for fettling the 
longitudes of all the other ftations where no obfervations of 
the pole-ftar could be had, or only fuch as were not to be de- 
pended upon ; we (hall, by way of further illustration of this 
matter, give another example of the calculations for the point 
M near Dunkirk, which will fuffice for all the other ftations 
comprehended in the general table of refults placed at the end 
of this fedion, where the relpective columns have been filled 
up by the fame or a iimilar mode of computation. 
Let G (Plate X. fig. 8.) be Greenwich ^ GRr its meridian ; 
Gg the perpendicular to that meridian, produced eaftward ; 
MR a parallel to that perpendicular drawn through the point 
Vol. LXXX. F f M; 
