Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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116
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libus, in quo oſtendemus ideo lignum ſurſum emergere, quia ab aqua
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extenditur, & ideo corpora ſurſum ire, quia alia deorſum eunt. </
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Theorema
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74.
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Quando lapis deſcendit per medium aëra, impeditur aliquantulum eius
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motus
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: </
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<
s
id
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">Probatur primò experientiâ, quæ certa eſt; </
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<
s
id
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">tàm enim aër impe
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dit motum deorſum, quàm ſurſum, vt videre eſt in mobili leuiore ſeu ra
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riore, quod etiam flante vento obſeruare omnes poſſunt; </
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<
s
id
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">quomodo ve
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rò impediat, dicemus aliàs; </
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>
<
s
id
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N18009
">ſecundò corpus immobile, in quod mobile
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impingitur, motum illius impedit; </
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<
s
id
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N1800F
">ſed in diuerſas partes aëris corpus
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graue impingitur in deſcenſu; igitur aliquantulum impeditur eius
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motus. </
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<
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<
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<
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<
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Theorema
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75.
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<
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Hinc motus naturalis deorſum aliquantulum retardatur,
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type
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quia nihil aliud
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præſtare poteſt huiuſmodi impedimentum, niſi aliquam retardationem;
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igitur motus inde redditur tardior. </
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Theorema
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76.
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<
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Hinc etiam impetus producitur imperfectior
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; quia ex imperfectione ef
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fectus requiritur imperfectio cauſæ per Ax. 13.l. </
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<
s
id
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">1. & quâ proportione
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eſt tardior motus eâdem impetus eſt imperfectior, per Ax. 5. excipe ta
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men impetum innatum, qui ſemper habet eundem effectum grauitatio
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nis, vel ſingularis, quâ grauitas cum ipſo medio, ſi reuerâ medium gra
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uitat, de quo aliàs. </
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Theorema
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77.
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Quo medium denſius eſt plus impedit motum deorſum
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; </
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<
s
id
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">Probatur, quia ſi
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motum impedit; certè non totum; quis enim hoc dicat; </
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<
s
id
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N1807B
">ſed eæ dumta
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xat partes, quibus incubat corpus graue; </
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>
<
s
id
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N18081
">igitur quò ſunt plures huiuſ
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modi partes, maius eſt impedimentum; </
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>
<
s
id
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N18087
">ſed in medio denſiori plures ſunt
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cum minore extenſione; </
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<
s
id
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">hoc enim eſt, quod voco denſius; igitur me
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dium denſius plùs impedit. </
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Theorema
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78.
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<
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id
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N180A3
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<
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Hinc tardiùs deſcendit mobile per mediam aquam, quàm per medium
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aëra,
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emph.end
type
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quia aqua eſt denſior aëre. </
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<
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<
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Scholium.
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</
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<
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<
s
id
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">Obſerua eſſe aliqua corpora minus denſa, quæ motum omninò im
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pediunt; </
s
>
<
s
id
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N180C3
">quippe certum eſt aquam eſſe denſiorem ligno; </
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>
<
s
id
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">atqui li
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gnum deſcenſum lapidis impedit, non verò aqua; </
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>
<
s
id
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">quia ſcilicet lignum
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non eſt medium, vt aqua; </
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>
<
s
id
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">vt enim aliquod corpus ſit medium, debet eſſe
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liquidum, vt, aqua & alij liquores; vel ſpirabile vt aër, vapor, &c. </
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>
<
s
id
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">ratio
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eſt, quia partes ligni, vel alterius corporis durioris, ita ſunt inter ſe con
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junctæ, vel implicatæ, vt omnem tranſitum intercludant, niſi corpus ip
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ſum graue valido ictu vel impetu ſibi viam aperiat; </
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>
<
s
id
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">igitur vt corpus ali
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quod vice medij defungatur, debet in eo ſtatu eſſe, in quo eius partes </
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>
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