Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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cèt aqua demerſa intra mercurium dicitur leuis, &
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moueri ſursùm à principio intrinſeco, at ſi eadem̨
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aqua intra oleum mergatur, dicetur iam grauis, noņ
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leuis, & moueri deorsùm à principio interno. </
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verò duplicem ſenſum habere poteſt, aut dictæ duæ
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contrariæ qualitates ſemper in eodem corpore aquæ
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exiſtunt, & vigent, aut ſucceſſiuè modò vna, modò
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altera in ea reperitur, ita vt aqua in fundo hydrar
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gyri poſita ſit reuera leuis, & nullo pacto grauis, &
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è contià, quando eadem aqua in oleo demergitur,
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hìc grauitatem habeat, & nullam prorsùs
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leuitatẽ
">leuitatem</
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,
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itaut remaneat ſopita, & extincta leuitas illa, quæ
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tanta efficacia
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aquã
">aquam</
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ſursùm impellebat à fundo mer
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curij, igitur in primo ſenſu retinere aqua deberet
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perpetuò duas contrarias qualitates, ſcilicèt leuita
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tem, & grauitatem eodem modo, ac dicuntur mixta
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participare ex qualitatibus extremis, calido nempè,
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& frigido, & veluti colores medij nigre dinem, at
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que albedinem participare
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censẽtur
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, igitur dici de
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beret, quod in igne prorsùs, & abſolutè leui qua
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tuor integri gradus leuitatis reperiuntur, & ſimili
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tèr in ipſa terra exiſtunt quatuor gradus grauitatis,
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at aer habebit tres gradus leuitatis, & vnicum gra
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dum ponderoſitatis, ſic aqua vnicum gradum lèui
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tatis, & tres grauitatis haberet, &
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tãdèm
">tandèm</
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aliud cor
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pus medium inter aerem, & aquam, veluti forſan
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eſt ſpiritus vini, habere poſſet duos gradus leuitatis,
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& duos alios gradus grauitatis.</
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