Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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              Cap. 4. poſi­
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              tiuam leui­
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              tatem noņ
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              dari.</s>
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              PROP. LVII.
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              Si Aer in aqua ſolummodò leuitatem exerceret, in ea non
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              aſcenderet à leuitate eius poſitiua impulſus.
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              <s id="s.000594">ET primò ſupponamus prædicta elementa noņ
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              retinere ſimùl eodemque tempore duas oppo­
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              ſitas facultates grauitatis, & leuitatis, ſed ſucceſſi­
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              uè modò vnam, modò alteram poſſideant, prout in
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              diuerſis medijs fluidis collocantur, ſcilicèt aqua iņ
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              aere pendula ſolummodò grauis cenſeri debeat, non
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              autem leuis, ſi poſtmodum aqua infrà hydrargyrum
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              mergatur, tunc aqua leuis ſit, non autem grauis, po­
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              natur etiam, quod aer, ſeù
                <expan abbr="lignũ">lignum</expan>
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              ſub aqua demerſum leue ſit, nec
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              grauitatem vllam habeat. </s>
              <s id="s.000595">Con­
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              cipiatur poſtea vas RGHS a­
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              qua D plenum, & in eo merga­
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              tur maſſa aeris, vel ligni F, pa­
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              tet ergò ex ſupradicta hypo­
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              theſi, quod aqua D
                <expan abbr="nullã">nullam</expan>
              leuitatem, ſed tantummo­
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              dò grauitatem habebit, eò quòd prædicta aqua non
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              ſupponitur demerſa intra aliud corpus fluidum den­
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              ſius, & ponderoſius ipſa, ſed contigua eſt aeri. </s>
              <s id="s.000596">Mo­
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              dò quia aer, vel lignum F ſupponitur ab aduerſarijs
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              ſursùm aſcendere à G, versùs R impulſa à poſitiua
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              leuitate eius naturali, aqua verò circumfuſa D cona­
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              tum, atque impetum exercet deorsùm ab A versùs
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              H veluti natura eius grauitatis exigit, habebimus </s>
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