Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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ſenſu percipimus; is profectò, magis ridiculus non eſſet, qui diceret,
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corpus grave deorſum trudi ab Angelo, quod tamen nulla ratione, nullo
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que experimento probari poteſt, quàm ij, qui dicunt, ab ea ſubtili materia
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trudi, cùm nulla ratione, & nullo experimento id probare poſſint. </
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Antim.
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<
s
id
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"> Rectè omnino; neque id ab vllo cordato viro negari poteſt,
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gravia ſcilicet ſponte ſua deorſum ire. </
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Auguſtin.
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<
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id
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"> Sed non item levia, quæ ideò ſurſum eunt, quia ſurſum à
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graviore medio extruduntur; Supponamus enim corpus aliquod levius
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graviori ſubeſſe; vel gravius
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tãtùm
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ſua ſponte deorſum ibit & ſurſum levius
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extrudet; vel tantùm hoc ſua ſponte ſurſum aſcendet, ac deorſum ex
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trudet gravius; vel ſimul vtrumque ſua ſponte ibit; quod levius tantùm
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nemo dixerit, & manifeſtæ convinci poſſet falſitatis. </
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<
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"> Scio neminem eſſe, qui hoc dicat; ſed quæſo te, fac, aliquem
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eſſe; quomodò illum convinceres; dic mihi ſodes. </
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Auguſtin.
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<
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id
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"> In hunc modum; eo modo, quo ſurſum extruditur corpus
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leve à gravi, aër v.g. ab aqua, cui ſubeſt, corpus grave deorſum detrude
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retur à levi, aqua, v. g. ab aëre, qui aquæ ſubeſſet: ſit ergo globus plum
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beus in aëre, ideò deſcendit, quia aër, qui ſubeſt, ſua ſponte aſcendens,
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illum deorſum extrudit; ille autem Cylindrus aëris in globum levitat; ita
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mihi loqui fas ſit, qui à globo ad terram vſque extenditur, vt patet; nec
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enim is, qui eſt ſupra globum in illum levitat, ſed potiùs gravitaret; corpus
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enim gravitat deorſum, ſurſum verò levitat; igitur ſi prædictus Cylin
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drus aëris primò ſit pedalis, ac deinde bipedalis, cùm tota vis gravitatio
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nis, ſeu detruſionis deorſum ſit ab aëre, qui eſt infra globum, & in eum le
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vitat; erit dupla vis detruſionis, ſeu gravitationis, quando aëris Cylin
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drus plumbeo globo ſubjectus erit duplus; dupla enim cauſa duplum effe
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ctum producit. </
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Antim.
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<
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"> Id quod dicis ex hoc experimento probari poteſt. </
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<
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">Sit v. g.
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Scyphus vacuus ſecundum perpendiculum in aquam immerſus, ore præ
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vio, ita vt nihil prorſus aëris ante in Scypho contenti avolare poſſit;
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haud dubiè, quo profundiùs immergitur, major vis ſurſum illum extru
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dens ipſo tactu ſentitur; nempe totus aquæ ſuperpoſitæ, Cylindrus cujus
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baſis ori vaſis, ſeu Scyphi circiter æqualis eſt, in aëra Scypho conten
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tam gravitat, magis autem, Cylindrus altior. </
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Auguſtin.
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<
s
id
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"> Igitur ſi prædictus Scyphus ita immergatur, vt primum
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vno palmo à ſuprema ſuperficie aqua diſtet, ac deinde profundiùs im
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mergatur, ita vt diſtet ab eadem ſuperficie duobus palmis, dupla tunc erit
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vis gravitationis ; quia duplæ cauſæ duplus effectus eſt: igitur cùm ſit eadem
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ratio, duplus Cylindrus aëris ſubjecti globo duplam vim motus in illum
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execet, ſcilicet levitationis, quod tamen falſum eſſe conſtat. </
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Antim.
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<
s
id
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"> Non dico duplam vim motus, ſed tantùm dico majorem vim,
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quod certè ad tuum propoſitum ſatis eſſe puto; cùm prædicti globi pon
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dus idem ſit, eademque vis illa, qua deorſum fertur, ſive vnum, ſive duos
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palmos altus à terra pendatur. </
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Auguſtin.
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<
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id
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"> Non dicis duplam vim motus? </
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<
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