Archimedes, Archimedis De iis qvae vehvntvr in aqva libri dvo

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170FED. COMMANDINI& denique punctum h pyramidis a b c d e f grauitatis eſſe
centrum, &
ita in aliis.
Sit conus, uel coni portio axem habens b d: ſecetur que
plano per axem, quod ſectionem faciat triangulum a b c:
& b d axis diuidatur in e, ita ut b e ipſius e d ſit tripla.
Dico punctum e coni, uel coni portionis, grauitatis
eſſe centrum.
Sienim fieri poteſt, ſit centrum f: & pro-
ducatur e f extra figuram in g.
quam uero proportionem
habet g e ad e f, habeat baſis coni, uel coni portionis, hoc
eſt circulus, uel ellipſis circa diametrum a c ad aliud ſpa-
cium, in quo h.
Itaque in circulo, uel ellipſi plane deſcri-
batur rectilinea figura a k l m c n o p, ita ut quæ relinquũ-
tur portiones ſint minores ſpacio h:
& intelligatur pyra-
mis baſim habens rectilineam figuram a K l m c n o p, &

axem b d;
cuius quidem grauitatis centrum erit punctum
e, ut iam demonſtrauimus.
Et quoniam portiones ſunt
minores ſpacio h, circulus, uel ellipſis ad portiones ma-
125[Figure 125] iorem proportionem habet, quam g e a d e f.
ſed ut circu-
lus, uel ellipſis ad figuram rectilineam ſibi inſcriptam, ita
conus, uel coni portio ad pyramidem, quæ figuram rectili-
neam pro baſi habet;
& altitudinem æqualem: etenim

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