Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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">4. Hinc ſingulis temporibus æqualibus deſtruitur gradus impe
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tui innato; </
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<
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">eſt enim eadem ratio pro omnibus: </
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<
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">igitur temporibus
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æqualibus deſtruitur æqualis impetus: </
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<
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">igitur amittit ille motus
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æqualia velocitatis momenta: </
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<
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">igitur eſt naturaliter retardatus: </
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<
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">igi
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tur iuxta eam proportionem decreſcit motus violentus, iuxtaquam
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creſcit naturalis: igitur dici debent de hac progreſſione retardatio
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nis, quæ dicta ſunt de illa progreſſione accelerationis. </
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<
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<
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">5. Hinc impetus imperfectior initio deſtruitur: </
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">quia, cùm motus
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ille ſit velocior initio, inſtantia ſunt minora: </
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<
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">atqui minori tempore
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minùs retardatur: </
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<
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">igitur inperfectior impetus deſtruitur; </
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">cùm è
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contrario in motu acceleratio initio acquiratur imperfectior, quia
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inſtantia ſunt maiora: vnde vides, gradus impetus eſſe heteroge
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neos, & principium illud etiam in impetu valere, ſcilicet, ſubiectum
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ita compleri ab vna forma, vt alterius homogeneæ non ſit ampliùs
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capax, ſaltem naturaliter. </
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<
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<
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id
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">6. Hinc vltimus gradus impetus violenti eſt omnium perfectiſ
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ſimus, vt conſtat. </
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<
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id
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">Quieſceret vno inſtanti mobile iactum ſurſum, ſi
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gradus vltimus violenti eſſet æqualis perfectionis, cum impetu in
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nato: </
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<
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id
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N106A7
">vbi enim ventum eſſet ad inſtans æqualitatis, neutrum præ
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ualere poſſet: </
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<
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id
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">igitur inſtanti ſequenti eſſet quies: </
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<
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">cùm tamen ſint
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diuerſæ perfectionis, perfectior præualet: vter autem ſit perfectior,
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dicemus infrà. </
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<
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">7. Cum mobile ſurſum reflectitur, vel terra perforata ſuam lineam
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motus ſurſum versus oppoſitam cœli plagam promouet, vel aliud
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æqualis ponderis, vel maioris, ſurſum mouet, tunc certum eſt, inna
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tum eſſe perfectiorem: </
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>
<
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id
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N106C5
">ſi verò imprimitur ab alia potentia motrice,
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tunc etiam imperfectior eſt impetu innato; </
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>
<
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N106CB
">nam inæqualis eſt; </
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<
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">alio
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quin, ſi eſſet æqualis, ſimul eſſent in eodem ſubiecto duo gradus
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homogenei: </
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<
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id
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">præſtat autem eſſe imperfectiorem, quàm perfectio
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rem, vt plura impetus puncta à potentia imprimantur; </
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">quòd mul
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tum facit ad mouenda maiora pondera: hinc nullo inſtanti quieſ
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cunt proiecta ſurſum. </
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<
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">8. Tandiu durat ſenſibiliter deſcenſus globi proiecti ſurſum,
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quandiu durauit aſcenſus; </
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<
s
id
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">eſt enim eadem ratio: ſagittæ verò mi
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nùs durat aſcenſus, quàm deſcenſus propter mixtionem materiæ. </
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Si motus violentus eſſet æquabilis, percurreret proiectum ſpatium
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ferè duplum eo tempore, quo retardato percurrit ſubduplum: </
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<
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">hinc
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ſonus tam citò auditur; </
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">quia propagatur cum particulis aëris æqua
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bili ferè motu: </
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<
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id
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N10706
">eſſe autem ſpatium ferè duplum, probatur ex eo, </
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front
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