Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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179
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<
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æqualis erit differentiæ prædictarum oppoſitarum
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celeritatum, & ideò aer G deſcendet duplo tardiùs
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aqua ambiente; Quòd verò hoc ſit falſum, experien
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tia ipſa docet ſi nimirùm aqua DE atro colore tinga
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tur, vel diſperſo puluere terreſtri pauliſper turbida
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reddatur, tunc procùl dubio particulæ illæ arenoſæ
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graues, aut ob exiguitatem in ipſa aqua dum quieſcit
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non deſcendunt, vel lento motu deorsùm feruntur a
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vi maioris grauitatis
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. </
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<
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">igitur quando aqua deor
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sùm fluit, videtur impoſſibile vt grauiores particulæ
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arenoſæ minori velocitate transferantur deorsùm̨,
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quàm aqua ipſa in qua degunt, quare bulla aerea G
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quæ vt leuis ſursùm aſcendere ſupponitur, non poſſet
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pari velocitate ſimul
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cũ
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particulis terreis aquæ tur
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bidæ deorsùm deſcendere, ſed hoc eſt falſum, cum
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abſque vlla differentia velocitatis deorsùm feran
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tur vnà cum aqua turbida cylindri fluentis, igitur ve
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rum non eſt, quòd aer G moueatur ſursùm à vi natu
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ralis leuitatis eius translatus, cùm
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quando re
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uera aer G principium motiuum leuitatis in ſe habe
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ret non poſſet vllo pacto in aqua ipſum
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exercere. </
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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PROP. LXXXVIII.
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Confirmatur aerem ab ambiente aqua per extruſionem ſur
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sùm impelli.
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<
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">EContrà quandò globus aereus G nullam pror
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sùs leuitatem haberet, & ſolummodò per ex
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truſionem factam à grauitate fluidi ambientis eleua-</
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