Valerio, Luca, De centro gravitatis solidorvm libri tres

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              vt eſt HN, ad NG, ita fiat KM, ad ML, & GM, iun­
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              gatur: & vt eſt GO, ad ON, ita fiat GP, ad PM, & iun
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              gantur MN, OP, FG, GD, GE. </s>
              <s>Quoniam igitur re
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              cta KL, ſecat trapezij BCFE, latera parallela bifariam
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              in punctis K,L, & eſt vt HN, ad NG, hoc eſt vt duplum
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              lateris BC, vna cum latere EF, ad duplum lateris EF, vna
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              cum latere BC, ita KM, ad ML; erit punctum M, cen­
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              trum grauitatis trapezij BCFE, & pyramidis GBCFE,
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              axis GM. </s>
              <s>Et quoniam vt GO, ad ON, ita eſt GP, ad
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              PM, atque ideo GP, tripla ipſius PM, erit punctum P,
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              centrum grauitatis pyramidis GBCFE, atque ideo in
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              linea OP. </s>
              <s>Rurſus quoniam angulus ACB; æqualis eſt
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              angulo DFK: & vt AC, ad CK, ita eſt DF, ad FK:
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              eſt autem DF, parallela ipſi AC, & FK, ipſi CL; erit
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              reliqua DK, reliquæ AL, parallela; vnum igitur planum
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              eſt, ADKL, in quo iacet triangulum GMN; cum igitur
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              ſit parallela KH, ipſi GL, vtque HN, ad NG, ita
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                <emph type="italics"/>
              K
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              M, ad ML; erit MN, ipſi LG, parallela: ſed OP, eſt
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              parallela ipſi MN; ſecant enim latera trianguli GMN,
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              in eaſdem rationes; igitur OP, erit LG, parallela. </s>
              <s>Simi­
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              liter ex puncto O, ad axes duarum pyramidum GABED,
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              GACFD, duæ aliæ rectæ lineæ ducerentur, quas & cen­
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              tra grauitatis pyramidum habere, & parallelas rectis GQ,
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              GR, alteram alteri eſse oſtenderemus, ſicut oſtendimus
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              OP, habentem centrum grauitatis pyramidis GBCFE,
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              ipſi GL, parallelam; ſed tres rectæ GL, GQ, GR, ſunt
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              in eodem plano trianguli nimirum ABC; tres igitur præ­
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              dictæ parallelæ, quæ ex puncto O, atque ideo trium præ­
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              dictarum pyramidum centra grauitatis erunt in eodem pla­
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              no, per punctum O, & trianguli ABC, parallelo. </s>
              <s>Quo­
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              niam igitur fruſti ABCDE, centrum grauitatis eſt in axe
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              GH; (manifeſtum hoc autem ex duobus centris grauitatis
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              pyramidis, cuius eſt prædictum fruſtum, & ablatæ, quæ
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              centra grauitatis ſunt in axe, cuius ſegmentum eſt axis </s>
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