Gassendi, Pierre
,
De motu impresso a motore translato epistulae duae
,
1642
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& parem vim faciens, impetum victorem continuò
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imprimat, nouúmque ſemper adiiciat; adeò vt in ſine
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motus deorsùm, tantundem ſit impetus ab aere,
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quantùm initio motus ſurſùm, impreſſum fuerat ab
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ipſa manu. </
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<
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">Et quæſo te, ſi aliquis lapidem ſurſùm ex
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fundo maris pari vi, qua aliùs ex imo aere projiciat;
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quare lapis nec tam altum aſcendet, neque ex
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am diſ
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ſito loco deorſùm redibit? </
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<
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">An-non quia aqua lapidi
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magis reſiſtet, quàm aer, impreſſumque impetum &
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vehementiùs franget, & expugnabit citiùs, ac dein
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ceps lapidi ſemper imminens, proprium impetum im
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primere perget, nec finem faciet addendi nouum,
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donec in fundum reduxerit? </
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modò eſt ſecundum majorem, minoremque reſiſten
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tiam; cùm aërem quoque non nihil reſiſtere argua
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tur, vel ex eo ſtridore, quem edit, dum à corporibus
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vehementiùs per ipſum actis frangitur. </
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<
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id
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">Et quamuis
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præ ſua tenuïtate non videatur poſſe impetui tanto re
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ſiſtere; cogita tamen proportionem eſſe cum aquæ
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reſiſtentia; illamque vt intelligas, compara non
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modò perexiguum, ac penè nullum lapidis aſcenſum
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ex fundo aquæ, cum incomparabiliter altiore ex
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imo aëre; ſed etiam progreſſum penè inſenſibilem
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bombardici globi per aquam tranſuerſùm adacti,
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reſpectu illius, qui per aërem fieri obſeruatur; &
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agnoſces, vt intra aquam propter maximam reſiſten
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tiam, paruum ſpatium peragitur; ſic in aëre propter
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paruam, ſpatium maximum peragi. </
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<
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fortè non eſſede reſiſtentia aëris, dum aliquid agitur
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ſursùm; ſed de impetu, qui imprimatur ab aëre, </
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