Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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ſum fertur, non tamen ſervata cylindri forma; licet enim ima portio cy
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lyndrica ſit, ſuperior tamen habet ſuperficiem quaſi ſphæricam,
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ſeu ſphæroidalem, hanc porrò induit aër, vt quaſi cuneatim aqua
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perrumpat; propria igitur ſpontè; vi ſcilicet levitatis, qua
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pollet. </
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Auguſtin.
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<
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id
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"> Si primo noſtro congreſſui interfuiſſes, Chryſocome, hoc
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experimentum, dubio procul omni, minimè adduxiſſes, obſervaſſes
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enim aquam ſecundùm latera tubi ſpiratim deſcendere, & ab ea ſurſum
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aëra extrudi, longè tardiore motu; quia ſurſum aër motu recto fertur,
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aqua verò deorſum, non recto, ſed ſpirali, quo rectum acceleratum im
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peditum compenſat; illud porro aëris faſtigium quaſi cuneatum, non ab
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aëre vi propria induitur, ſed inducitur ab aquæ pondere versùs tubi late
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ra deflectente ad deſcenſum; alioquin ſi aër propria vi hanc figuram in
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duit, cur non conicam, quæ ad aſcenſum & aquam perrumpendam lon
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gè aptior eſſet; nec enim difficiliùs vnam quàm aliam indueret; immo
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fortè conicam, quæ ad cylindricam propriùs accedit. </
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<
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">Vtinam æquè
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facile mihi eſſet, definire, quænam figura illa ſit, illiuſque cauſam
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afferre, quam nemo, ſaltem quod ſciam, hucuſque adinvenit; hîc
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tuam operam, Antime; nec enim eum me reputo; qui hunc nodum
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ſolvam. </
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Antim.
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<
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id
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"> Non eſt mihi dubium, quin hæc ſuperficies curva ab aqua ver
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sùs latera vaſis inclinante formetur; cùm enim aqua deſcendere non poſſit,
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niſi aër loco cedat, extruſus ſcilicet ab aqua, & hic ſurſum extrudi non
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poſſit, niſi humor illi ſeſe ſupponat, vt hoc faciat, eundem aëra quaſi
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complexa per tubi latera ſpiratim deſcendit. </
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<
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id
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">An verò dicta ſuperficies pa
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rabolica ſit, dubium eſt; cum enim aqua versùs latera vaſis tendat, ſimul
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& deorſum motu accelerato, inde reſultas motus mixtus, qui lineam pa
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rabolicam poſt ſe relinquit, vt jam alij demonſtrarunt; ſed vnde erit mo
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tus ille horizontalis cum perpendiculari conjunctus? </
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<
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id
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">an fortè dicendum
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eſt, aquam ſpiratim deſcendere, cœpta quaſi à centro ſpira; donec ad
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latera vaſis perveniat; ab illa autem ſpira deorſum producta ſupremum
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illud aëris faſtigium tornari, cùm aliter ſpiræ deorſum produci non poſ
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ſint: ſed his omiſſis, cùm cylindrus aëris ab aqua ſtringatur, per latera
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delabente, tantulùm aſſurgat, neceſſe eſt; vnde aqua, cui ſuprema illius
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baſis ſubeſt, cedit locum; & cùm hæc attolli non poſſit, versùs latera
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eat oportet, vbi dumtaxat ei locus patet; ſcilicet inter aëra & late
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ra vaſis, vnde linea parabolica reſultat; hinc ſi tubus ſit anguſtior, vix
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aqua cylindrum inter aëris & latera tubi intercipi poteſt; vnde prædicta
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ſupremi faſtigij forma non ſequitur, quæ certè minùs convexa eſt, ſeu
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acuta, quò rima inter aëra & latera vaſis, qua perrumpit aqua, eſt angu
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ſtior: immo ſi tubus inclinetur, convexitas prædicti faſtigij deorſum ver
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sùs inferiùs tubi inclinati latus producitur; quia eò major ponderis aquæ
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vis fertur, ex quo etiam manifeſtè colligitur, hanc convexi fa
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ſtigij figuram ab aqua versùs latera vaſis labente tornari. </
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<
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