Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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arenulas commixtas cum ipſam et aqua, imò
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arenularum poroſitates pertranſire valerent. </
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Cap, 7. de
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natura flui
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ditatis.</
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">Nec præterea obſtat, quòd poroſitates vitri, aut
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metalli non ſint directæ, ſed miris modis contortæ, &
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anfractuoſæ, nec ſemper eiuſdem amplitudinis, nam
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nihilominùs vetari, & impediri non poſſet tranſitus
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fluentis aquæ, ſaltem tardiori motu, longiorique
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abbr
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tẽ-pore
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pore</
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, quàm ſi per poroſitates directas, & æquè latas
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pertranſire debuiſſet. </
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id
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gat, ſcilicèt aqua intra vas vitreum diù incluſa num
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quam exudet, concedendum eſt, minimas eius parti
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culas non fluidas, ſed conſiſtentes eſſe. </
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Licèt poroſi
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tates cuius
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libet corpo
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ris ſint tor
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tuoſæ tamen
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à fluido per
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meari poſ
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ſunt.</
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">Quòd verò pori cuiuslibet vaſis permeabiles om
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ninò ſint, nec viæ obturamentis impediantur, occlu
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danturque, probari ſatis poteſt ex eo quod per eos
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aliqua fluida penetrant, vt hydrargyrum per poros
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auri, aqua, oleum, & hydrargyrum quoque per po
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ros ligni, & vaſis fictilis, quare per eoſdem reliqua
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omnia fluida neceſſariò pertranſire, & fluere debe
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rent, ſaltèm tardiori motu, ſi verum eſt, quòd nulla
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fluidi pars aſſignari poteſt, quæ paritèr fluida non
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ſit; deberet igitur aer effluere è vaſe fictili, & ligneo
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quotieſcumque violentèr
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immiſſusibidẽ
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cõdenſatur
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. </
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PROP. CXLII.
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Ad fluidi conſtitutionem requiritur omnium partium diuiſio
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in minimas particulas, talis figuræ, vt vna ſuper alte
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ram facilè fluere posſit, & omnes æqualem vim
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motiuam grauitatis habeant.
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