Valerio, Luca, De centro gravitatis solidorum, 1604

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1portionis: eſto ea cuius diameter KL, iungensque recta
DE ſphæræ, vel ſphæroidis, & baſis portionis centra DE,
atque producta incidat in ſphæræ, vel ſphæroidis ſuperfi­
ciem ad partes E in puncto F, & ad partes oppoſitas in
puncto B: ſphæræ igitur, vel ſphæroidis axis axi portionis
BE congruens crit BDEF, nam vertex portionis erit B:
& hemiſphærio, vel hemiſphæroidi KBL ſit circumſcri­
ptas cylindrus, vel cylindrica portio KH, cuius ſcilicet
axis BD, & circa axim DE, alter cylindrus, vel portio
cylindrica GL portioni KACL circumſcripta: quorum
circumſcriptorum ſolido­
rum vtriulque communis
baſis erit circulus, vel
ellipſis circa KL.
Ita­
que ex his compoſitus to­
tus cylindrus, vel cylin­
dri portio GH erit por­
tioni ABC circumſcri­
pta, habens axim BE, at­
que ideo eandem altitu­
dinem ABC portioni,
baſim autem, cuius dia­
meter ſit GM ſimilem
159[Figure 159]
& æqualem ei, quæ eſt circa KL.
Dico portionem ABC
ad cylindrum, vel portionem cylindricam GH, eſse vt ſo­
lidum rectangulum contentum ipſis BE, EF, ED, vnà
cum binis tertiis duorum cuborum, duabus ſcilicet cubi
BD, & totidem cubi ED, ad ſolidum rectangulum con­
tentum ipſis EB, BD, DF.
Quoniam enim parall ele­
pipeda eiuſdem altitudinis inter ſe ſunt vt baſes, erit vt re­
ctangulum BEF vnà cum duabus tertiis ED quadrati ad
rectangulum BDF, ideſt ad quadratum BD, ſiue DF,
ita ſolidum ex BE, EF, ED, communi altitudine DE,
vnà cum duabus tertiis cubi ED, ad ſolidum ex DE,

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