( ) 
Ob angulos ad D & d redos, funt punda D & d ad 
eireumferentiam circuli diametro CQdefcripti. Sitiftius 
circuli centrum E. Turn dudis E z 8c E 5 circulo occur- 
rentibus in F & I, f & i, erit D z x z Q_ = F z * z I = 
EFq:— Ezq: = EQq:— Ezq d £ * 1 0,= E § q . 
— EQq: Quare eric fumma omnium E Qjq : x p — • 
E z q : x p = (ummse omnium E § q : x * — E Q q : * , 
Sc terminis tranfpofitis, fumma omnium E Qq : * p + * : 
= fummas omnium Ezqj * p + E?q : * foe eft, ft 
p ponatur tarn pro particulap jntra circnlum, quam pro 
particular extra circulum, erit fumma omnium EQ.q: 
* p = fummae omnium E z q : * p. Ad C Q due 
normalem z s. Turn erit Ezq:=Ozq:-t-ECq: 
* — Q C x C s. Quo valore ipfius E zq : ei fub-* 
ftimto, & squatione debite tradatd, tandem inve- 
nies fummam omnium CQ „ C s x p = fumma: om 
nium C z q : « p. Unde eft C Q 
fummae omnium C z q : x p . . „ r 
iumm: omnium Is « p 
omnium C z q :■* p ip fa quantitas C in calculo centri 
Ofcillarioms *• & fi centrum gravitatis fit G, & ad C Qj 
ducatur normalis Gg, Sc corpus ipfum dicatur A, erit 
fumma omnium Cs » p = C g * A. Unde eft C Q 
C 
= — r » Sit centrum Ofcillationis 0$ turn per. 
Cg * A 
5 C 
Theor. 1 . erit C O = Unde eft Cg:CG: .* 
CG x A 
€ O : C Q. Quare per O duda ad C O perpendicularis 
teanfibit per pundum Q. Q. E. I. 
