Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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proportionis reperitur inter totale motus impedi
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mentum, ſcilicèt inter quietem quam affert aqua de
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ſcenſui ligni, & impedimentum quod eidem affert
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aer quieſcens, in quo aliquo gradu velocitatis mo
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uetur; quia verò quam proportionem habent velo
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citates ex aduerſario, eamdem reciprocè habere de
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bent denſitates mediorum fluidorum; diſtat verò in
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finitè quies à motu, igitur infinitè quoque diſtarę
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deberent inter ſe, reciprocè denſitates fluidorum, &
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proindè aqua infinitè denſior aere eſſet, ſic enim nul
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lam proportionem eorum denſitates haberent, quod
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eſt omninò abſurdum; ex quibus omnibus deducitur
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falſum eſſe aduerſarij ratiocinium. </
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Cap. 10. de
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æquitempo
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ranea natu
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rali veloci
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tate
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grauiũ
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<
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">Poſtquam oſtendimus naturalia corpora in vacuo
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moueri, non in inſtanti, ſed in tempore debere, &
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præterea corpora inæqualitèr grauia non moueri ſe
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cundum proportionem, quam habent eorum graui
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tates, debemus poſtremo loco
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, quod ſi om
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nia impedimenta, quæ dependent à medio fluido in
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motionibus corporum grauium tolli poſſent, quod in
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ſpatio inani verificari poſſet, tunc planè omnia cor
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pora inæqualitèr grauia ſpecie, & mole, quibuſcum
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que figuris prædita, eodem tempore per idem
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ſpatiũ
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deſcendere deberent. </
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<
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">Hanc | ad mirabilem propoſitio
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nem Galileus omnium primus protulit dialogo pri
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mo de motu locali, & in ſuis poſtillis non dum typis
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excuſis, eam tamen non demonſtrauit, ſed coniectu
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ris, & probabilibus
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tantũmodò
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rationibus confir
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mare conatus eſt; quia verò huiuſmodi propoſitio v-</
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