Gassendi, Pierre, De proportione qua gravia decidentia accelerantur, 1646

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              <s id="s.001226">
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              vbi percuſſio facta per vnum corporum illorum nota
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              fuerit, notam quoque eam fore, quæ fict per alterum:
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              adeò vt ſi, exempli gratiâ, prius corpus in vnam bi­
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              lancis lancem decidens eam percuſſionem faciat, qua
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              altera cum pondere centum librarum attollatur, deci­
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              dens poſterius eam facturum ſit, qua attollatur cum
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              pondere librarum mille. </s>
              <s id="s.001227">Iam, cùm tua verba fuerint,
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              Tantam præcisè corporis eſſe velocitatem, quantus impetus,
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              quantàque ipſa percußio fuerit: impetum enim omnem, &
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              percußionem ex velocitate eſſe, imò impetum ipſum velocita­
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              tem eſſe nullóque hæc ab inuicem diſcrimine dirimi: vt me­
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              ritò proinde quaratione accreſcit velocitas, eadem impetus, &
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              percußio augeantur:
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              eapropter licet dicere velocitates
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              corporum illorum in fine motus ita ſe habere, vt ſi à
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              priore acquiſiti ſint decem gradus velocitatis, quibus
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              pondus decem librarum adauctum ſit vſque ad cen­
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              tum, acquiſiti etiam fuerint decem gradus à poſteriore,
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              quibus pondus centum librarum adauctum fuerit vſ­
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              que ad mille. </s>
              <s id="s.001228">Et certè iſta graduum velocitatis æquali­
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              tas in proportione partium grauitatis adie ctitiæ funda­
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              ta, dici poteſt cauſſa cur duo corpora pondere, ſiue
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              grauitate ſimplici ſummè inæqualia (vt ſi alterum pen­
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              dat libras mille, alterum non ampliùs, quàm vnciam)
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              æquali cadant tempore; vnde & viciſſim arguantur
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              eſſe æqui-velocia. </s>
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              <s id="s.001229">Accedamus propiùs ad hypotheſin. </s>
              <s id="s.001230">Oſtendere
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              volui velocitatis gradus menſurandos non eſſe, vt tu
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              aſſerebas, penes globorum diametros, quæ menſura­
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              rent ſingulos caſus.
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              Sunto enim,
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              inquam,
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              globi, verbi
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              caußâ, duo ex eadem materia, quorum vnus ſit diametro
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              </s>
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