Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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motus, nam poſtquam leuius corpus B ad æquabili
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tatem redigitur, continuatur adhuc
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abbr
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incremẽtum
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im
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petus in grauiori ſolido A; totum ergo id, quod au
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getur gradus impetus ipſius A creat notabilem ex
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ceſſum ſupra illum gradum debilem corporis B
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eodẽ
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,
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& vniformi gradu impetus excurrentis, quare neceſ
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sè eſt, vt propè initium motus parùm differant velo
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citates grauium A, & B, ſcilicèt fiant ſecundùm pro
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portiones ſuperiùs expoſitas, & poſtea in progreſſu
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motus multò magis inter ſe differant. </
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<
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euincitur ex eo, quòd ſi prædicta inſignis inæqualitas
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velocitatum, quę in progreſſu
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motuũ
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eorum obſer
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uatur, eſſet propria, & naturalis horum corporum
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per</
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in eodem fluido in eadem proportione fieri de
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beret, ſcilicèt in quibuslibet temporibus æqualibus
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moueri deberent proportionalibus velocitatibus, &
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ſic medulla ſambuci v.g. quæ in decem minutis
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ſecũ-dis
">ſecun
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dis</
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horarijs pertranſit ſemiſſem itineris exacti à pila
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marmorea, vt refert Merſennus, etiam in vno minuto
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ſecundo illa medietatem ſpatij huius pertranſiret,
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quod euidentèr falſum eſt.
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Pro. 243. &
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244.</
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Pro. 245.</
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Cap. 11. gra
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uia in fluido
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velocitati
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bus inæqua
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libus ferri
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debere.</
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Prop. 241.
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& 243.</
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Reſponde
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tur experi
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mento
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Mer-ſẽi
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ſeni</
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, & alio
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rum.</
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<
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">Hinc reſoluere poſſumus difficultatem ab experi
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méto Merſenni deſumptam; is enim ſumpſit duas pi
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las æquales, vnam plumbeam, alteram argillaceam,
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& in profunditate trium pedum aquæ inſumpſit
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plũ-
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bum</
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vnum minutum
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, argillacea verò quin
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que minuta ſecunda, noſter verò calculus minorem̨
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inæ qualitatem efficit, dum enim pila plumbea
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dit</
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ſpatium aliquod in vno minuto ſecundo, argilla-</
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