Valerio, Luca, De centro gravitatis solidorum, 1604

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Sit conoides hyperbolicum ABC, & pars eius para­
bolicum EBF circa eundem axim BD: & conoides
EBF ad reliquum conoidis ABC eam habeat proportio­
nem, quam ſeſquialtera tranſuerſi lateris hyperboles per
axim ABC ad axim BD.
Dico fieri poſſe quod proponitur.
Habeat enim DL ad LB quamcumque proportionem: &
conoides ABC reliquo ſolido AEBFC dempto conoi
de EBF. ſit conus circa axim BD æqualis GBH: &
deſcribatur conus GLH: & ſecta BD bifariam in pun­
cto K, & rurſus BK, KD in multitudine, & longitudi­
ne æquales inſcribatur conoidi EBF, & altera cirumſcri­
196[Figure 196]
batur, vt in antecedenti factum eſt, figura ex cylindris æ
qualium altitudinum, ita vt exceſſus, quo circumſcripta
ſuperat inſcriptam fit minor cono GLH; & cylindris cre­
ſcentibus in latitudinem abſoluatur figura conoidi ABC
circumſcripta ex cylindris altitudine, & multitudine æqua
libus ijs, qui ſunt circa conoides EBF.
Quoniam igitur
primus exceſſus eſt minor cono GLH, multo minor crit
pars eius communis ſolido AEBFG, quàm conus GLH:
ſed ſolidum AEBFC æquale eſt cono GBH; reliquum
igitur ſolidi AEBFC dicto communi ablato, maius erit
coni GBH reliquo BGLH; minor igitur proportio eſt

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