Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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reſiſtit, deſcendere non poteſt infra C, niſi vacuum inducatur, quod expo
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ſito Naturæ inſtituto repugnat, vt patet. </
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Auguſtin.
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<
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"> Scire velim, cur particulam illam
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ſaltem Solo,
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addi
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deris, quaſi fortè putes cylindrum illum aëris nonnihil con
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ferre. </
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Antim.
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<
s
id
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"> Dicam paulò poſt; ſi enim materia illa tenſa rarior eſt aëre, exter
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nus aër haud dubiè nonnihil confert, de quo infra; ne rationes contra illam
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hypotheſim, quam impugno, interrumpam. </
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<
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">Sit ergo ſenta ratio; Quan
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do admovetur corpus
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calidũ
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ſegmento CD, poſt deſcenſum Mercurij v.g.
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Lacca liquata, ſeu ferrum candens, Mercurius ſubſidit infra C, igitur
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non ſuſtinetur à cylindro aëris externi, quod, ni fallor, perſpicuè pro
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bare poſſum; nam cùm idem maneat cylindrus aëris exterioris, eadem
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vis illius manet; igitur idem Mercurij ſegmentum IC ſuſtinet; cur ergo
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deſcendit Mercurius infra C? hoc autem ſequitur, ſive ſegmentum CD
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vacuum ſit, ſive tenui materia plenum; primum quidem, vt patet; alte
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rum verò, quia cùm materia illa frigore denſatur, & contrahitur, vel
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ſecum adducit in illa contractione Mercurij ſuperficiem C, atque ita aër
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exterior ſegmentum Mercurij extantis non ſuſtinet, ſed hoc materiæ te
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nui adhæret, & hæc fiſtulæ; vel
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ſecũ
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non adducit, ac proinde fit vacuum; nec
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Mercurius ſupra C aſſurgit, cùm ſupra illud attolli non poſſit à Cylindro
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exterioris aëris, cujus pondus idem manet, ac proinde iiſdem viribus
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pollet. </
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Auguſtin.
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Hæc ratio, ne quid diſſimulem, rem mihi prorſus perſuadet;
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cylindrus enim aëris exterioris, à quo, vt nonnulli volunt, Mercurij ex
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tantis ſegmentum ſuſtinetur, neque plus, neque minus poteſt ſuſtinere; igi
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tur ſi ferrum candens admoveatur ſegmento CD, & hoc vacuum ſit; nul
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la eſt ratio, cur ſuperficies C ſubſidat; ſubſidit tamen; ſi verò nix, vel trita
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glacies admoveatur CD, & hoc plenum ſit tenui materia, hæc quidem
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contrahitur, niſi tamen ſecum ſuperficiem C adducat, attollátque, hæc
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haud dubiè non aſſurgit; cùm à cylindro aëris vltra C attolli non poſſit; ſi
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autem, eam materia illa ſeſe contrahens ſecum adducat, attollátque; ad
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ſuſtinendum ſegmentum Mercurij IC adhærentis prædictæ materiæ, vt
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hæc fiſtulæ, cylindri exterioris æquipondio non eſt opus. </
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Chryſoc.
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<
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"> Quid ſi dicerem, vitrum ipſum fiſtulæ contrahi præ frigore, &
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præ calore explicari; ac proinde materiam illam ratione vaſis, modò con
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trahi, modò explicari, ex quo etiam Mercurij ſuperficies ſubſidat, vel aſ
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ſurgat? </
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Auguſtin.
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Hæc reſponſio nullius momenti eſt vt jam ſupra oſtenſum fuit;
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ſuppoſito ſegmento CD vacuo, ſi verò ſupponatur plenum ſubtili materia,
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contrarium omnino accideret; vbi enim laxatur vitrum, cùm plus ſpatij re
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ſtet, dicta materia
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totũ
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implere non poteſt, vnde Mercurius aſſurgat opor
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tet, cùm tamen præ calore ſubſidat; vbi verò vitrum contrahitur, minus ſpa
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tij ſupereſt intra ſegmentum CD, quod cùm non ſufficiat, tenui materiæ
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ſuperficiem Mercurij premit, ac proinde hæc ſubſidit, cùm tamen præ figu-</
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