( i?8 ) 
Points N and M defcribe the Curves A N and BM ; 
and at the lame time, the invariable Angle R D Q» 
revolve about the third Pole D, lb that the Inter- 
fe&ions R and Q_ defcribe the Curves E R and G Q_ j 
then the Dimenfions of the Locus of P, when higheft, 
lhall be equal to the quadruple Product of the Num- 
bers that exprels the Dimenfions of the given Curves 
AN, E R, G Q_ and B M, multiplied continually 
into each other. If more Poles are afiumed, about 
which Angles be fuppofed to move, as R D Qmoves 
about D in this Defcription, and the Intericdtions 
of the Sides be Hi II carried over Curves, as in this 
Example ; the Dimenfions, of the Locus of P, when 
higheft, lhall ftill be found equal to the quadruple 
Producft of all the Numbers that exprefs the Dimen- 
lions of the Curves employed in this Defcription. 
6 . Suppofe that the three invariable Andes 
P Q_K, K L R, R N P, move over the Curves G Q 
EL, AN, fo that the Sides P Q, K L, P N pro- 
duced, pals always through the Poles C, D, S, and 
that the Interfedrions of their Sides K and R, at 
the fame time move over the Curves F K and B R • 
and 
