= ("7) = 



lam praerogatiuam tribuamus, abfciffas OX a pun<?to medio O 

 computemus, quem in finem ponamiis O C zzz O C zzz £, vt 

 pro centro C fit abfcifia CX zzz x -+-£, pro alterO vero cen-» 

 tro C 7 X zzz x — &, quia in partem contrariam vergit, binae 

 autem reliquae coordinatae XYetYZ aeque referuntur. Hinc 

 du&is diftantiis C Z et C' Z, erit 



C Z zzz v — ]/ (x -f- kf -\-yy -{-zz et 



CZ zzz V zzz /^-A/+;; + u, 



ita vt fit v v -f- i/ v' zzz 4/: jt. 



§. 14. Quod 11 nunc vt ante vis ad centrum C ten- 

 dens vocetur — V, altera vero vis ad centrum C tendens 

 zzz V v , fumto elemento temporis dt conitante tres aequatio- 

 nes motum determinantes erunt: 



I 9 d X V (X H- fe) j y' (X — k) . 



a dt* v v' ' 



II. dd y — !___ iLz - 



' a. 6t z 1) v' 3 



III ^ 3 z ' X_5 y/ z ' 



a d tz i> v 



~ t 



vbi ftatim commode vfu venit, vt fecunda per tertiam diuifa 

 praebeat hanc fimplicem aequalitatem |i> zzz =*, ideoque s^^y 

 — ^ d d z zzz o , hinc igitur integrando fiet z dy — y d z zzz 

 Cd*zzz£i*, pofito fcilicet elemento curuae defcriptae zzzd/ 



ct celeritate zzz u. 



1 



§. 15. Ponamus nunc vt ante d x ~pd s^ dy—qds 

 et d z zzz r d j, ita vt fit p /> -f- q q -\- r r zzz 1 , eritque C d t 

 zzz 9 s (q z — ry), ideoque u zzz — L., — Porro vero ob fum- 



f y ' l q z • — r y 



tum d$ conftans fiet d d s zzz ^^y^r — xdq) ve j et j • 



g z — r j 7 x n 



leritatem habebimus 9 d s zzz iH_if , vn de erit 



P 3 Wx 



