( ! 4 ) 
Turn ex notiffima indole centrk gravitatis erit M= Gg x A. 
' d C 
Unde eft CO = ~ 
Prop. 3 .. Theor. i. 
lifdem poftis^ qu<£ratur pun ft urn 0 in reft a C G tranfe- 
unte per centrum gra.vitata.tis G. Turn erit 0 centrum 
Ofcillationis corporis A. 
Etenim in hoc cafu fit 
= per Cor. Prop. I 
PTTr— r* At datur A, Sc 
C G x A 5 
dato pun&o C, dantur 
C G 8c quantitas C. Un- 
de datur CO, qualifcunq^ 
fit corporis Ofcillantis inclinatio ad Horizontem. I- 
deoq j per def. & Prob. i. eft O centrum Ofcillationis cor- 
poris A. Q. E* D. 
Prop. j. Theor. 2 . 
lifdem pofiiis, Jit D aggregatum omnium G zi 2 x p. 
Turn erit C 0 ~ C G — — — T , 
C G * A 
Ad C G due normalem z F, afq^erit C z q : = C G q : 
-1- G z q .* — 2 C G x G F, nempe cadente F intra C8c 
G. At ubi F cadit in C G produda, erit C z q : 
=e C Gq: 
