Valerio, Luca, De centro gravitatis solidorum, 1604
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              PROPOSITIO XX.
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              <s>Omnis portio ſphæræ, vel ſphæroidis abſciſsa
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              duobus planis parallelis centrum intercipienti­
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              bus, ad cylindrum, vel cylindri portionem, cuius
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              baſis æqualis eſt circulo maximo, vel ſimilis, &
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              æqualis ellipſi per centrum baſibus portionis pa­
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              rallelæ, & eadem altitudo portioni, eam habet
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              proportionem, quam duo ſolida rectangula ex ter­
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              norum ſphæræ, vel ſphæroidis axis ſegmentorum
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              eundem terminum habentium alterutrius ba­
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              ſium portionis centrum, binis ſphæræ, vel ſphæ­
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              roidis axem complentibus, & ſingulis axis por­
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              tionis itidem à centro ſphæræ, vel ſphæroidis fa­
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              ctis, vnà cum binis tertijs partibus duorum cubo­
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              rum ex ſegmentis axis portionis à centro ſphæræ,
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              vel ſphæroidis factis; ad ſolidum rectangulum,
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              quod duobus ſphæræ, vel ſphæroidis axis dimi­
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              diis, & axe portionis continetur. </s>
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              <s>Sit portio ABCD ſphæræ, vel ſphæroidis, cuius cen­
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              trum E, axis portionis KEH: ipſi autem portioni cir­
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              cumſcriptus cylindrus, vel cylindrica portio NO, vt in
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              antecedenti, cuius communis ſectio cum ſphæra, vel ſphæ­
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              roide AFDG, ſit circulus maximus, vel ellipſis circa dia­
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              metrum LEM; quamobrem baſis ſolidi NO, eiuſdem
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              altitudinis portioni ABCD circulus erit æqualis circu­
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              lo maximo, vel ellipſis æqualis, & ſimilis ellipſi circa LM
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              baſibus portionis parallelæ. </s>
              <s>Dico portionem ABCD </s>
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