Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ro poſt fuſionem refrigerato videre eſt. </
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Cap. 7. de
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natura flui
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ditatis.</
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Hoc expe
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rimento
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cõ-probatur
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probatur</
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Cap. 7. dę
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natura flui
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ditatis.</
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">Sed ad maiorem huius doctrinæ euidentiam con
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ſideretur aggeries arenæ minutiſſimæ, & aridæ, hæ
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quidem non excurrunt, neque lubricitatem habent,
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ſi poſtea immiſſa, & intercepta aqua lutoſam
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formã
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acquirat,
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tũc
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particulæ aquæ inter arenulas intercep
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tæ nedùm eas diſſociant, ſed veluti rotæ, vel cylin
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druli, aut materia aliqua vnctuoſa commoditatem eis
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præſtat, vt poſſint excurrere vna particula arenæ ſu
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per aliam contorqueri, atque agitari, & tandem ob
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natiuam grauitatem quælibet earum deorsùm ten
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dendo explanantur, & ad ſuperficiem planam hori
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zontalem rediguntur, quòd priùs abſque aqua illą
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inter arenulas intercepta in cumulum ſatis accliuem
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ſuſtinebatur, acquirit ergò maſſa illa arenoſa vnà
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cum aqua conſiſtentiam fluidam, explanatur, & reci
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pit figuram continentis vaſis, non ſecùs, ac vitrum,
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& ferrum fuſum efformatur, & paritèr ad inſtar glo
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bulorum cryſtallinorum, qui licèt ſint aridi abſque
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vllo fluido admixto, & omninò quieſcant in vaſe ali
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quo, neque agitentur, omnes tamen iam dictas flui
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di proprietates retinere videntur. </
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Et exemplo
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luti
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tur</
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PROP. CXLVI.
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Requiritur vis motiua grauitatis in omnibus partibus fluidi,
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non vt fluiditatem constituat, ſed vt explanare ho
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rizontaliter fluidum posſit.
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<
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">VErum tamen eſt, quòd illa præcipua conditio, &
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proprietas fluidi, qua explanatur, & æqualitèr </
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