Gassendi, Pierre
,
De proportione qua gravia decidentia accelerantur
,
1646
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In quo tu quidem fœlicior fuiſti; ſed vereor non pa
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rùm, ne accuratior illa tua experientia neutiquam tuæ parti
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ſuffragetur; quamuis dicas com nodè ad
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G
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alilei mentem
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accidiſſe, vt globus non-niſi ex quatuor diametrorum altitu
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dine decidens attollere potuerit duplum eius ponderis, quod ex
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vnius diametri eleuatione ſummum extulerat; ſicut nec tri
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plum, niſi ex altitudine diametrorum nouem, &c. </
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<
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tuo exemplo inductus, cùm idem tentare item voluerim; ne
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que globum ex vnius diametri altitudine, ſuum pondus toties
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multiplicatum attollere comperi; neque ad duplicatum, tri
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plicatumque pondus eleuandum, ad tantam altitudinem attolli
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debuiſſe. </
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<
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">Vſus ſum quidem bilance obuia, & fortaßis non ita
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exacta, & globo Porphyretico vnciæ
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1,
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drachm
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2
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ſatis exactè.
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<
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">Reperi autem hunc globum repetita aliquoties operatione ex
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vnius diametri altitudine eleuare ſolùm vncias
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5,
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dr.
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2
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(neſcio
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an vitio bilancis acciderit, vt maius pondus non extulerit) at
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idem globus duplum illius ponderis, ex diametris tribus, tri
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plum ex quinque, quadruplum ex ſeptem, quintuplum ex
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nouem ſustulit; interruptus autem nihil vlteriùs tentare po
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tui. </
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<
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">Ex his autem adhûc vides (quod totius controuerſiæ ca
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put eſt) æqualibus spatiis æqualia acquiri velocitatis aug
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menta. </
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<
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id
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">Hanc ego tamen operationem tibi tanquam exactam
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non propono, quia necdum mihi per otium licuit eam adhi
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bere diligentiam, quamres huius momenti pro ſuo merito po
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ſtulat: ſed vt te quoque ad exactam illius rei experientiam
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inuitem; ex qua tota de motu accelerato controuerſia diri
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menda videatur.
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">Poſtrema hæc verba, quàm eſſent te digna; niſi
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aliunde Demonſtrationem, quod mox obiiciebam, ita
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propugnares, acſi foret iam controuerſia à te dirempta
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