Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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rius aerei cylindri prementis ſtagnantem ſuperfici
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em E, & ab hoc
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ſuſpẽditur
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mercurius AB. igitur à
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virtute manus ſuſtinetur reſiduum ponderis vltra æ
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quilibrium, ſcilicèt pondus vitri AB vnà cum ponde
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re cylindri aerei orificio, & digito A incumbentis,
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licèt falsò perſuadeatur ſe ſuſtinere mercurium ſub
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iectum, eique adnexum. </
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Cap. 6. non
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dari attracti
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onem.</
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<
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">Et profectò ab hac experientia euincitur, quòd tra
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ctio illa, quæ in digito percipitur, non ſit vera attra
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ctio facta ob vacui timorem, quia dum fiſtula minùs
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cubito cum quadrante eleuatur, mercurius à digito
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non diuellitur, & proindè ſpatium inane ibidem non
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intercipitur, vnde nulla attractio fieri deberet, cùm
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è contrà maxima fieret quando ob mercurij deſcen
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ſum efficitur ſolita inanitas, & tamen hoc falſum eſt,
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cùm in vtroque caſu ferè æquali vi digiti pulpa de
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orſum attrahi ſentiatur. </
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examinati debet pulcherrima, & ingenio
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ſiſſima difficultas, quam cariſſimus amicus Diony
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ſius Guerrinus M.D. Ætrur. </
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Caſtrẽſis
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Generalis pre
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fectus mihi diſcutiendam propoſuit. </
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">Dicebat enim ſi
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in tubis pneumaticis, ſeu cteſibijs, quibus aquam̨
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haurire ſolemus è puteis, aqua eleuatur, non
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quidẽ
">quidem</
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vera attractione, quatenùs embolo eleuato hauritur,
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vel exugitur aqua ſubiecta, vt pueri calamo intrą
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aquam immiſſo reſtricto ore, & anhelitu, & ſpiritu
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attracto aquam ſursùm eleuant; ſed hoc contingit,
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quia dum embolus manu ſursùm trahitur, impellitur
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ſursùm quoque cylindrus aereus embolo
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incumbẽs
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, </
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