Valerio, Luca, De centro gravitatis solidorum, 1604

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1catarum quadrata eſſe inter ſe in eadem proportione; erunt
prædictæ inter ſectionem parabolam, & baſim interiectæ
inter ſe longitudine, vt in ellipſe ad diametrum ſimiliter
vt diximus applicatæ inter ſe potentia.
Manifeſtum eſt
igitur propoſitum.
PROPOSITIO V.
Omnis figuræ circa axim in alteram partem
deficientis, cuius ſuperficies, excepta baſe ſit to­
ta interius concaua baſim habentis circulum, vel
ellipſim; quælibet tres ſectiones baſi parallelæ
æqualia axis ſegmenta intercipientes, ita ſe ha­
bent, vt minor ſit proportio minimæ ad mediam,
quam mediæ ad maximam.
Sit figura ABC circa axem BD in alteram partem de­
ficiens, qualem diximus: & poſitis in axe BD tribus qui­
buslibet punctis
F, E, L, æqualia
axis ſegmenta in­
tercipientibus, in
telligatur ſolidum
ABC ſectum per
ea puncta planis
buibuſdam baſi cir
culo, vel ellipſi,
circa AC pa­
rallelis: quare ſe­
ctiones erunt cir­
141[Figure 141]
culi, vel ellipſes ſimiles baſi, per definitionem, quarum dia­
metri eiuſdem rationis in eodem plano per axim ſint IK.

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