Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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cùm imminet aliqua diuturna, & continuata pluuia
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in illa regione, tunc mercurius in fiſtula per aliquos
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gradus ſupra conſuetam altitudinem eleuatur, è con
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trà pluuia iam actu cadente mercurius in prædicta fi
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ſtula deprimi ſolet, nec eſt exigua prædicta differen
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tia, multotiès enim Piſis obſeruaui in diuturnis plu
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uioſis tempeſtatibus variaſſe mercurij altitudinem̨
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per duodecim gradus, ſcilicèt per latitudinem vnius
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pollicis. </
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ſtolæ, quam Sereniſſimo Principi Leopoldo modò
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Cardinali ampliſſimo anno 1657. ſcripſi circa hanc
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materiam, hìc afferam breuiter ea, quæ tunc ſpecu
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latus ſum, quod nimirùm fieri poteſt ob aeris preſ
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ſionem ſupra mercurium ſtagnantem in fiſtula, vt an
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te pluuiam aer multò magis grauitet, & comprimat,
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quam in ipſo pluuiæ deſcenſu, quod vt clariùs oſten
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dam, præmittendum eſt. </
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Cap. 5. de ae
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ris grauitate
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æquilibrio,
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ſtructura, &
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vi elaterią
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eius.</
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PROP. CXIV.
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In fiſtula Torricelliana intra puteum demerſa ſi aqua
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à grauiori ſuper addito fluido occupetur, mercu
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rius in fistula altiùs ſubleuatur, at post
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illius delapſum denuo mercurius
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deprimitur.
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<
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">SVmpta fiſtula vitrea ABC flexa in B, & facto iņ
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ea vacuo, more ſolito, mercurius eleuetur vſque
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ad F, demittatur poſtea fiſtula intra vas vitreum cy
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lindricum DE maximę altitudinis earum quæ exca-</
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