Valerio, Luca, De centro gravitatis solidorvm libri tres
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              PROPOSITIO XVII.
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              <s>Omnis portio ſphæræ, vel ſphæroidis abſciſſa
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              duobus planis parallelis, alteroper centrum du­
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              cto, ad cy lindrum, vel cylindri portionem, cuius
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              baſis eſt eadem, quæ maior baſis portionis, &
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              altitudo; eam habet proportionem, quam rectan­
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              gulum contentum ijs, quæ à centro minoris baſis
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              fiunt axis ſphæræ, vel ſphæroidis ſegmentis, vnà
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              cum duabus tertiis quadrati axis portionis; ad
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              ſphæræ, vel ſphæroidis dimidij axis quadratum. </s>
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              <s>Sit portio NACO ſphæræ, vel ſphærodij, cuius cen­
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              trum D, axis autem axi portionis congruens BEDR,
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              abſciſsa duobus planis parallelis altero per centrum D, ſe­
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              ctionem faciente circulum
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              maximum, vel ellipſim,
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              cuius diameter NO, & ſu­
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              per dictam ſectionem, cir­
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              ca axem ED, ſtet cylin­
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              drus, vel portio cylindrica
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              NM, abſciſsa ijſdem pla­
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              nis, quibus portio NAC
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              O, à cylindro, vel portio­
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              ne cylindrica NG, ſit cir­
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              cumſcripta hemiſphærio,
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              vel hemiſphæroidi NBO:
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              qua ratione erit cylindri,
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              vel portionis cylindricæ NM baſis eadem, quæ maior
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              baſis portionis NACO, circulus ſcilicet, vel ellipſis cir­
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              ca NO, & eadem altitudo portioni. </s>
              <s>Dico portionem </s>
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