Ceva, Giovanni, Geometria motus, 1692
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              18.
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              huius.
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              Ex eadem.
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              PROP. XXI. THEOR. XVI.
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              <s id="s.000639">PRopoſitis ijſdem ſolidis, erunt inter ſe, vt momenta fi­
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              gurarum a quibus ſunt, quæ tamen figuræ ſuſpenſæ
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              ſint ex longitudinibus deductis ab ipſarum grauitatum̨
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              centris vſque ad coeuntium figurarum communes illas ſe­
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              ctiones. </s>
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              <s id="s.000640">Figuræ, à quibus ſunt ſolida, ponantur ABC, GLH,
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              tra grauitatum illarum M, N; axes, ſiue communes ſectio­
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              nes coeuntium binarum interſe ſimilium, ac æqualium fi­
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              gurarum à quibus dicuntur ipſa ſolida; & demum MO, NP
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              perpendiculares ſint ab ipſis centris ad illas communes ſe­
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              ctiones deductæ CE, HL. Dico, ſolidum à plana figurą
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              ABC ad ſolidum a plana GHL eandem habere rationem,
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              ac momentum figuræ ABC pendentis ex MO ad momen­
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              tum alterius figuræ ſuſpenſæ ex NP, ſunt enim hæc ſoli­
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              da interſe, vt rotunda, quorum genetrices figuræ ABC,
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              GLH circa axes CE, HL, huiuſmodi verò ſolida ſunt vt
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              momenta propoſita; ergo ſolidum à plana figura ABC ad
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              ſolidum à plana GLH, erit vt momentum figuræ ABC
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              ſuſpenſæ ex MO ad momentum GLH pendentis ex NP.
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              <s id="s.000641">Quod &c. </s>
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              Tab.
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              6.
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              fig.
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              10.</s>
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              pr.
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              20.
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              huius.
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              Ter. lem.
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              31.
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              in libro </s>
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              men. parabolæ.
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              Corollarium.
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              Cum ipſa illa momenta nectantur ex rationibus figurarum
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              ABC, GLH, & ex longitudinibus, ex quibus pendent ipſæ fi­
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              gura (nam habentur vt grauia) ex ijſdem etiam rationibus
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              componentur ſolida, qua ſunt ab ipſis figuris—
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