Descartes, René
,
Renati Des-Cartes principia philosophiae
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quàm verſus alteram, & ideò, niſi quid aliud accedat,
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manet immotum. </
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eſſe ſupponamus, ſemper accurat à totidem particu
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lis fluidi ex unâ parte pelletur quàm ex alterâ; modò
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ne fluidum ipſum in ullam partem magis feratur
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quàm in reliquas. </
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>Et ſupponere debemus B omni ex
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parte à fluido D ſ circumdari; atque ſi fortè non tanta
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ſit iſtius fluidi quantitas in F quàm in D, nihil refert:
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quia non agit in B ſe toto, ſed duntaxat iis ſuis parti
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bus quae ſuperficiem ejus attingunt. </
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ſpectavimus B ut immotum; jam ſi ponamus ipſum
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ab aliquâ vi, aliunde adveniente, impelli verſus C,
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haec vis (quantumvis exigua) ſufficiet, non quidem ad
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ipſum ſe ſolâ movendum, ſed ad concurrendum cum
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particulis corporis fluidi FD, ipſaſque determinandas
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ad illud etiam pellendum verſus C, eique partem ſui
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motûs communicandam a. </
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LVI.
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Fluidorum particulas
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aequali vi verſus om
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nes partes moveri. </
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corpus durum in flui
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do exiſtens, à mini
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mâ vi poſſe determi
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nari ad motum. </
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Quod ut clariús intelligatur, fingamus primò, cor
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pus durum B nondum eſſe in fluido FD, ſed hujus fluidi
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particulas aeioa, diſpoſitas in modum annuli, moveri
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circulariter ſecund`m ordinem notatum aei; aliaſque
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ouyao moveri eodem modo ſecundùm ordinem nota
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rum o u y. </
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ejus particulae moveri pluribus modis, ut jam dictum
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eſt b. </
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<
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>Quieſcat deinde corpus durum B in hoc fluido FD
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inter a & o: quid fiet? Nempe particulae aeio impe
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dientur ab ipſo, ne poſſint tranſire ab o verſus a, ut
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abſolvant circulum ſui motûs; itemque particulae ouya
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impedientur ne pergant ab a verſus o; ac venientes ab </
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