Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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<
s
id
="
s.001999
">
<
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pagenum
="
172
"
xlink:href
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025/01/176.jpg
"/>
tè fiat, ſuſpendatur canaliculus tenui filo pendulo ex brachio extremo bi
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lancis; ita vt deorſum ire non poſſit, ſed tantùm parum immergatur in
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ſuperficiem aquæ ſubjecto vaſe contentæ; occludaturque ſupremum os ca
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naliculi cera, aut ſuilla veſica, antequam immergatur, ac deinde immerſum
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illius pondus accuratè appendatur, admoto ſcilicet iuſto pondere oppoſitæ
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lanci; poſteà verò aperiatur acu ſupremum os prius obſtructum; aſſurgit
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illico aqua per canaliculum, licèt nihil ponderis prorſus accedat: Illa igi
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tur aquæ portio, quæ per canaliculum aſcendit, dicto filo pendulo non
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ſuſtinetur, ſed ab alio principio, eoque applicato; ſcilicet ab aëre com
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preſſo; hoc experimentum, ſi accuratè fiat, rem iſtam evincit. </
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>
</
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<
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type
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<
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id
="
s.002000
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<
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type
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italics
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Chryſocom.
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emph.end
type
="
italics
"/>
</
s
>
<
s
id
="
s.002001
"> Sed vnde hujuſmodi aëris compreſſionem eſſe putares? </
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>
</
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<
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type
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<
s
id
="
s.002002
">
<
emph
type
="
italics
"/>
Auguſtin.
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emph.end
type
="
italics
"/>
</
s
>
<
s
id
="
s.002003
"> Huic tuo quæſito faciam ſatis; ſi dixero ex duplici capite pro
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venire, Primò, ex admixtione vaporis & halitus; cùm enim noſter aër purus
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lb
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non ſit, multa hujuſmodi habet admixta, vnde illius compreſſio ſequitur.
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</
s
>
<
s
id
="
s.002004
">Secundò, ex pondere ſupremi aëris incubantis: fieri enim non poteſt, quin
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aër ſubjectus inde compreſſus evadat. </
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>
</
p
>
<
p
type
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main
">
<
s
id
="
s.002005
">
<
emph
type
="
italics
"/>
Chryſocom.
<
emph.end
type
="
italics
"/>
Eſt quod multa opponam. </
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>
<
s
id
="
s.002006
">Primò, totus aër gravitat gra
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vitatione communi; ne igitur pars inferior in ſe ipſum gravitare dica
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tur, dicendum videtur. </
s
>
<
s
id
="
s.002007
">Superiorem aëris tractum in inferiorem non
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gravitare. </
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type
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<
s
id
="
s.002008
">
<
emph
type
="
italics
"/>
Auguſtin.
<
emph.end
type
="
italics
"/>
</
s
>
<
s
id
="
s.002009
"> Dare non poſſum totum aëra gravitatione communi gravi
<
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tare in quodlibet corporis ſubjecti punctum; nec enim vllum centrum
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gravitatis commune habet, quod iis dumtaxat gravibus competit (de
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phyſico loquor) quorum tota vis gravitationis per vnicam lineam à præ
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dicto centro ductam exeritur ; corpus liquidum, vt aqua, & ſpirabile, vt
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aër, niſi contineantur in vaſe, per Cylindros deorſum, parallelos, gra
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vitant; ſcilicet ad ſenſum; cùm alioquin omnes Cylindri gravitationis
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versùs idem centrum eant; vnde paralleli eſſe non poſſunt; equidem ſe
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cundùm eundem Cylindrum gravitatio omnium partium, quæ illum
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componunt, ita communis eſt, vt omnes ſimul in corpus ſubjectum gra
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vitent, & ſingulæ ſupra ſingulas ſubjectas immò ſupra eandem ſubjectam
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omnes ſuperiores, in eodem tamen Cylindro; cogita lapidem lapidi ſuppo
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ſitum, ſubjectus enim omnes ſuperiores ferre cenſetur. </
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<
s
id
="
s.002010
">
<
emph
type
="
italics
"/>
Chryſocom.
<
emph.end
type
="
italics
"/>
</
s
>
<
s
id
="
s.002011
"> Tota igitur illa gravitatio reducitur in lineas; ſinguli enim
<
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Cylindri ſunt totidem lineæ; linea autem, aut nihil, aut parum ponde
<
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ris habet; nulla igitur inde compreſſio, aut certè modica; quid enim
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/>
tam parvi ponderis vis efficeret: ponamus enim Cylindrum aqueum da
<
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tæ baſis & altitudinis pendere vnam libram; ſupponamus item aquæ gra
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vitatem eſſe ad gravitatem aëris vt 1000. ad 1. haud dubiè Cylindrus aë
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ris æqualis pendit tantùm vnam milleſimam partem vnius libræ; igitur
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ſi 1000. hujuſmodi Cylindros ita diſponas, vt vnus alteri imponatur, om
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nes ſimul vnam libram pendent; cùm autem in infinitum contrahi baſis
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poſſit, & in eadem proportione creſcere altitudo, certè habebis Cylindrum
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petitæ cujuſlibet altitudinis, qui vnam libram pendat, licèt ad lineam non
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dum redactus, ſeu contractus ſit. </
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