Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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vllum
<
expan
abbr
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gradũ
">gradum</
expan
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impetus, quia ſcilicet impetus innatus in omnibus inſtan
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tibus præcedentibus habuit motum
<
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abbr
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deorsũ
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; </
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<
s
id
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">igitur nullo
<
expan
abbr
="
inſtãti
">inſtanti</
expan
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præteri
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lb
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to exigebat motum oppoſitum: adde quod vltimo inſtanti deſcenſus quo
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lb
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mobile ponitur in F impetus naturalis non exigit ampliùs motum, cur
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enim potius verſus M quàm verſus N, igitur primo tantùm inſtanti aſ
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cenſus quo mobile fertur verſus N, impetus naturalis exigit mobile re
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dire in F. </
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</
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<
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<
s
id
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">Dices, ſi primo inſtanti aſcenſus nullus gradus impetus deſtruitur; igi
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tur nec ſecundo neque tertio, non eſt enim potior ratio pro vno quàm
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pro altero. </
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<
s
id
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">Reſponderet negando, nam ideo, vt iam indicaui, primo
<
expan
abbr
="
inſtã-ti
">inſtan
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lb
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ti</
expan
>
aſcenſus nullus gradus deſtruitur, quia inſtanti immediatè
<
expan
abbr
="
antecedẽti
">antecedenti</
expan
>
,
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quod erat vltimum deſcenſus, impetus innatus non exigebat quidquam
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ampliùs, igitur nullus gradus eſt fruſtrà, igitur nullus deſtruitur, at verò
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inſtanti aſcenſus impetus innatus exigit pro ſequente, quod eſt ſecun
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dum aſcenſus mobile redire in F, igitur ex illa pugna ſecundi inſtantis
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deſtruitur aliquid impetus; </
s
>
<
s
id
="
N1E4B0
">ſed profectò primo aſcenſus deſtruitur ali
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lb
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quid impetus, quia aliquid motus remittitur, propter impetum inna
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lb
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tum; </
s
>
<
s
id
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N1E4B8
">igitur aliquis impetus eſt fruſtrà: </
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<
s
id
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N1E4BC
">non tamen hoc facit, quin omnes
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gradus in deſcenſu acquiſiti concurrant ad aſcenſum; igitur tot concur
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runt ad aſcenſum, quot ad deſcenſum, cum hac tamen differentia, quod
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impetus innatus, qui concurrit ad deſcenſum, non ad aſcenſum ſit longè
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velocior vltimo inſtanti motus acquiſito, qui concurrit ad deſcenſum,
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non ad aſcenſum, </
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Theorema
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74.
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Hinc in ea proportione creſcit impetus in deſcenſu, qua decreſcit in aſcenſu,
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& in eadem creſcit, & decreſcit motus in eadem creſcunt, & decreſcunt ſpa
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tia,
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v.g. ſint ſex inſtantia deſcenſus iuxta proportionem ſcilicet inſtan
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tium, in qua res iſta faciliùs explicatur: </
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>
<
s
id
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">primo inſtanti motus ſunt duo
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gradus impetus, quorum alter tantùm concurrit, ſcilicet qui præextitit; </
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qui enim producitur primo illo inſtanti, non concurrit ad illum motum
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per Th. 34. lib. 1. igitur primo inſtanti ſunt duo gradus impetus, vnus
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gradus motus, & vnum ſpatium; </
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<
s
id
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">ſecundo verò inſtanti ſunt tres gradus
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impetus quorum vnus non concurrit, 2. gradus motus, 2.ſpatia, atque ita
<
lb
/>
deinceps; donec tandem ſexto eo vltimo inſtanti deſcenſus ſint 7. gra
<
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dus impetus, quorum vnus non concurrit, 6. gradus motus, & 6.
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ſpatia. </
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<
s
id
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">Similiter primo inſtanti aſcenſus ſunt 7. gradus impetus, quorum
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vnus non concurrit ſcilicet innatus, 6. gradus motus, 6. ſpatia; ſecundo
<
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6.gradus impetus, quorum vnus non concurrit ſcilicet innatus, 5.gradus
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motus, 5.ſpatia, atque ita deinceps. </
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Theorema
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35.
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Hinc æqualia ferè vtrimque ſunt ſpatia deſcenſus ſcilicet, & aſcenſus
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emph.end
type
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; v.g.
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MF æquale FN, quia eſt ſumma eorumdem terminorum per Th. 74.
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igitur ex F mobile aſcendit ad altitudinem FN æqualem altitudini FM, </
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