Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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195
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tur cùm cylindrus exterior eandem vim ſemper habeat, æquale ſe
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gmentum IC ſemper ſuſtinet; ſed hoc experimento repugnat;
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nam ſi tantulum aëris antequam demittatur Mercurius in fiſtula re
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linquatur, Mercurius deſcendet infra C; in C autem ſuſtineri de
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beret; ſi à cylindro aëris exterioris, ſuſtineretur, vt patet; im
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mo deſcendit infra C non juxta menſuram cylindruli aëris in fiſtula
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relicti, ſed juxta majorem ; vnde illum aëra multùm dilatari, neceſſe
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eſt; vnde fortè aliam materiam intra fiſtulam dilatatam eſſe di
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cemus. </
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Auguſtin.
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<
s
id
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s.002311
"> Huc recurrit hypotheſis Autoris ſupra laudati; dicent enim
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illius ſententiæ aſſertores, illud tantulum aëris intra fiſtulam relicti, poſt deſ
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cenſum Mercurij liberiorem nanciſci campum, ac proinde cùm ante com
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preſſus eſſet, explicare ſeſe ac dilatare, & premere ſuperficiem Mercurij,
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vnde hic infra C deſcendit. </
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Antim.
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<
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id
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s.002313
"> Tantam compreſſionem aëris jam ſupra ſatis efficaciter refu
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tavi; hic tantùm addo, ſi vacuum remanet ſegmentum CD, illam aëris par
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ticulam ſatis ſpatij habere, vt explicet ſeſe, ac proinde non premere ſuper
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ficiem Mercurij, ideo enim illam premere dicitur quia nititur explicare ſe
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ſe, cùm plus æquo compreſſus ſit. </
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<
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s.002314
">Si verò ſegmentum CD non eſt
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abbr
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vacuũ
">vacuum</
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,
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ſed plenum, jam videndum eſt, quare
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plenũ
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ſit; ſi aëre dilatato, hæc particu
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la haud dubiè dilatatur, compreſſa igitur non manet; ſi æthere, vt volunt ali
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qui, per poros adducto, certè illa, tantùm ætheris, vel ſubtilis materiæ por
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tio exugitur, ſeu per poros adducitur, quæ ad
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occupandũ
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ſegmentum CD,
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ne vacuum reſtet, neceſſaria eſt: ſed primus locus cedit intra
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dictũ
">dictum</
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ſegmen
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tum præfatæ aëris portioni; ſi demum eſt alia ſubtilis materia tenſa, potio
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ri jure prædictus aër tenditur ac dilatatur; igitur compreſſus non ma
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net, igitur ſuperficiem Mercurij ſegmento CI contenti deorſum non
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premit. </
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Chryſocom.
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<
s
id
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"> Cur ergo Mercurias deſcendit infra C? neſcio, vtrùm aliam
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cauſam excogitare quis poſſit. </
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Antim.
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<
s
id
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s.002318
"> Non deeſt alia cauſa, nempe Mercurij IC pondere prædicta
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aëris particula dilatatur; vt enim aër Mercurij pondere comprimitur in
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fontibus quibuſdam arte factis, ita & eodem dilatatur; quid mirum ergo,
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ſi Mercurius infra C deſcendat? </
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<
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id
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s.002319
">hoc autem novo experimento perſpicuè
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demonſtro; ſi enim fiſtulam BD & vas ABG, non Mercurio, ſed aqua
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impleas, admotóque digito, extremum B in aquam EF immergas, di
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gitúmque ſubducas; fiſtula plena manet; ſi autem non prorſus aquâ fiſtu
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lam impleveris, admotóque digito extremum B immerſeris, ſubduxeríſ
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que digitum, aqua tantulum deſcendit v. g. ſi dum admotus eſt digitus
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extremo B immerſo ſuprema ſuperficies aquæ ſit in M, ſubducto digito
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deſcendit, quaſi in N; hac tamen ratione, vt dum ſuperficies aquæ eſt circa
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mediam altitudinem ID, puta in C ſegmentum deſcenſus prædictæ ſuper
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ficiei majus ſit; minus verò, quo dicta ſuperficies accedit propriùs ad D
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vel ad I. </
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Auguſtin.
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Hæc
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experimẽta
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eò jucundiora mihi accidunt, quo
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illorũcauſas
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