Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ſed in aqua, vel in aere, illa enim habebit tres gradus
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grauitatis, & vnicum leuitatis, ergo ignis per
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aquã
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aſcendet velocitate trium graduum; in mercurio ve
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rò impetu octo graduum, & terra per ignem octies
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velociùs deſcendet, quàm per aquam. </
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habet vnicum gradum grauitatis, & tres gradus le
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uitatis, igitur ignis octies velociùs per mercurium
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aſcendet, quàm per aerem, vnde hac ratione habe
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bimus menſuram vnius gradus impetus tàm in
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ſu</
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, quàm in deſcenſu, qui comparari poteſt cum im
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petu ignis per mercurium aſcendentis, & terræ per
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ignem deſcendentis; & proindè facilè conijci po
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terit, an prædictæ velocitates extremorum elemen
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torum reuerà ſint octuplæ, vel non, comparatæ ad
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velocitates quas exercent in intermedijs elementis.
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& licèt experimentum non det exactam
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,
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nihilominùs ſufficientiſſimè euincit falſitatem peri
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pateticæ hypotheſis, ſed licèt reuerà vis, & energia,
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qua corpora aſcendunt, vel deſcendunt, minimè de
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duci poſſit ex velocitate tranſitus ſursùm, vel deor
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sùm, vt ſuo loco apertè oſtendemus, tamen aſſumi
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poteſt cum aduerſario ad eum redarguendum. </
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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<
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id
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">Conſiderentur deindè elementa intermedia, vt
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ſunt aer, & aqua, ſeù alia corpora mixta, quæ
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eiſdẽ
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gradibus leuitatis, & grauitatis afficiantur. </
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ſtrandum eſt, nullum eorum corporum, quæ
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ſursùm poſitiuam leuitatem habere. </
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