Valerio, Luca, De centro gravitatis solidorum, 1604

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                <pb xlink:href="043/01/036.jpg" pagenum="28"/>
              parallelepipedum GK, eſse æquale parallelepipedo AB;
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              & rectam DE, axim parallelepipedi GK. </s>
              <s>Iungantur
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              enim baſium oppoſitarum diametri GH, LK. </s>
              <s>Quo­
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              niam igitur qua­
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              drata ſunt EG,
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              GH, communem­
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              que habent angu­
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              lum, qui ad G,
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              conſiſtent circa di­
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              ametrum GH; in
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              recta igitur GH,
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              erit punctum E.
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              </s>
              <s>Et quoniam qua­
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              dratum GH, eſt
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              quadrati EG, qua­
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              druplum; erit dia­
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                <figure id="id.043.01.036.1.jpg" xlink:href="043/01/036/1.jpg" number="19"/>
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              meter GH, diametri EG, dupla; punctum igitur E,
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              erit in medio diametri GH. Rurſus, quoniam ob pa­
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              rallelepipedum GK, recta GL, æqualis eſt, & paral­
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              lela ipſi KH, erit LH, parallelogrammum: & quia
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              vtraque DE, KH, eſt ad ſubiectum planum perpendi­
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              cularis, parallelæ erunt, & in eodem plano parallelogram­
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              mi LH; in quo cum LG, ſit parallela ipſi KH; erit &
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              ED, ipſi LG, parallela: eſt autem, & æqualis vtrilibet
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              ipſarum GL, GH, oppoſitarum; punctum igitur D, eſt
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              in recta LK, & tam KD, ipſi EH, quàm LD, ipſi
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              EG, æqualis erit, & inter ſe æquales LD, DK. pun­
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              ctum igitur D, erit in medio diametri LK; ſed & pun­
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              ctum E, erat in medio diametri GH; recta igitur ED,
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              axis eſt parallelepipedi GK, cuius parallelepipedi cum
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              altitudo DE, ſit ad BC, altitudinem parallelepipedi AB,
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              vt eſt baſis AC, ad quadratum F, hoc eſt ad baſim GH,
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              parallelepipedi GK; parallelepipedum GK, parallelepipe
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              do AB, æquale erit, Factum igitur eſt quod oportebat. </s>
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