388. The Inverfe Method 
t:r:y, there- 
2 ata but x:7 
beets r ; ry 
fore x= ri and « ==— —— , confequently | 
y 
a x r ry 
a * Va oe ee ee 
Infrommnct 
v4 ¥ 
J == fluxion of the fector CV A. 
29V 7? — y? 
But in this cafe ¢ —— 
5 ie: 
Sse 1—m x r* y 
VV er? a y? 
fore the Aluxion of thecircular fettor CVY = 
ph es OE 
— Take )/SPE 1s: hy- 
AY V7? ays pap 
perbolic fector: circular fector VCY, and make 
Coors then is pa point in the traje@ory. 
From this conftru@tion it will eafily appear, 
that the number of revolutions which the body 
muft make before it arrives at the centre will 
be infinite, becaufe the area CV A increafes 
without limit. 
Or the trajectory may be conftruéted in the 
following manner, Defcribe the femicircle 
SVD (Fig. 4).) with the radius Ch =r; 
draw AB perpendicular to G D, and fuppofe 
it equal to > and take the arc V R= the difference 
of 
