Gassendi, Pierre
,
De proportione qua gravia decidentia accelerantur
,
1646
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cauſa accelerationis diſſerüerit, docendo ſolam grauitatem
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eſſe cauſſam initij motus, & ſolùm medium, putà aërem eſſe
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cauſſam accelerationis, quatenus à fronte reſiliens, & à tergo
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clandem, graue vrget; cùm alioquin ſola grauitate agente, ſi
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bique ſimili manente, vt in vacuo, deſcenſus foret vniformis,
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ſimiliſque ſui perſeueraturus: idcircò anſa & accepta, & in
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hunc locum dimiſſa eſt adiiciendi quidpiam de Phyſica cauſſa.
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ad calcem ſuperioris Epistolæ: declarando videlicet, quo pro
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greſſu tentatum fuiſſet in Epiſtolis
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de Motu impreſſo à
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motore tranſlato
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cauſſam dicere, quamobrem grauia acce
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lerentur iuxta progreßionem numerorum imparium ab vnita
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te incœptorum; & quemadmodum talis cauſſa fuiſſet agnita
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tum primo momento ſola attractrix Terræ vis, quæ imprime
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ret ſingularem ictum: tum ſecundo, & reliquis tam eadem
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attractrix, quàm aër à tergo ſuccedens, inſtanſque, adeò vt
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quolibet momento duo quaſi ictus imprimerentur: ſicque &
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primo momento vnus acquireretur velocitatis gradus, quo ſu
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peraretur vnum ſpatium: ſequente autem quolibet ſuper-ad
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derentur duo, eſſentque proinde tres, quinque, ſeptem, &c.
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<
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">quibus spatia totidem conſequenter ſuperarentur: vnde &
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conſentaneum foret velocitates eſſe, vt spatia, quæ proinde ſi
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mul repræſentari deberent per illas triangulorum areas: quod
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animaduerſum eſt repugnare. </
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<
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">Deinde verò oſtenditur,
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quamobrem cùm cauſſa vnica ſufficiat, iuxta antè expoſita
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(ſupponitur autem videri non eſſe ipſam aliam, quàm ipſam
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vim Terræ tractricem) oſtenditur, inquam, vtramque à
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R. P.
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aßignatam videri eſſe reiiciendam, quatenus medium,
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putà aër, ad accelerationem nihil confert, quin-etiam potiùs
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