DelMonte, Guidubaldo, In duos Archimedis aequeponderantium libros Paraphrasis : scholijs illustrata

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1ſphæram aliquam, putà ligneam, vel alterius (ſimilaris tamen)
naturæ
intuenti; ſiquidem eius medium erit centrum magni­
tudinis
, & centrum figuræ; idemquè punctum erit ipſius cen­
trum grauitatis; circa quod vndi〈que〉 partes æ〈que〉ponderant.
& quoniam hæc ſphæra non eſt in centro mundi; propterea
tria
tantùm centra ſimul conuenient.
ſi verò ſphęra non ſimi­
laris
, ſed diſſimilaris fuerit, veluti altera ipſius meditate plum­
bea
, altera verò medietate lignea exiſtente, tunc eius medium
erit
quippe centrum magnitudinis, & figurę, grauitatis verò
centrum
nequaquam.
Nam partes vndi〈que〉 circa medium æ­
〈que〉ponderare
non poſſent; ſed grauitatis centrum ad grauio­
rem
partem, nimirum plumbeam declinabit.
& hoc modo
duo
tantùm centra inter ſe conuenient.
vt etiam (modo ta­
men
diuerſo) accidit ellipſi; cuius centrum eſt centrum figu­
, ſiquidem per ipſum tranſeunt diametri; idemquè punctum
eſt ipſius centrum grauitatis.
quod cùm non ſit propriè me­
dium
figuræ, non erit quo〈que〉 centrum magnitudinis. medium
enim
figuræ propriè circulo, ac ſphæræ tantùm competit.
Quare
duo centra hoc quo〈que〉 modo ſimul tantùm conue­
nient
.
In figura paraboles recta linea terminatę centrum gra
uitatis intra figuram reperitur, quippè quod ne〈que〉 centrum
figuræ
, ne〈que〉 centrum magnitudinis eſſe poteſt.
etenim in
hac
figura non poteſt dari medium, vnde ne〈que〉 centrum ma
gnitudinis
dabitur, & quoniam in parabole diametri ſunt in
terſe
ęquidiſtantes, vt ex primo libro conicorum Apollonij
Pergei
conſtat; ne〈que〉 etiam centrum figuræ dabitur.
ſic igi­
tur
centra nullo modo conuenient.
16 Federi­
ci
comm. de
centro
gra
uitatis
ſoli
dorum
.

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