Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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eiuſdem ferri, vel vitri fluentis inſignitèr augetur ſu
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pra molem, quam idem corpus durum, & conſiſtens
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priùs habebat; ignis ergò copioſiſſimè, & vehemen
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tiſſimè fluens inter particulas ferri, vel vitri
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pro
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pemodum præſtat, ac rotulæ, vel cylindri ſuper quo
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rum rotunditatem lapides anguloſi, & figuras irre
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gulares habentes labuntur, vel vſum præſtat ſebi,
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vel cuiuslibet alterius corporis vnctuoſi, ope cuius a
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renulæ aſperrimæ
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lubricitatẽ
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acquirere poſſunt, & v
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na particula ſuper aliam facili negotio circumuolui,
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agitari, ac dilabi poteſt, quod perindè eſt, ac ſi præ
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dictæ particulæ vitri, aut ferri acquiſiuiſſent figuram
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lęuem, rotundam, vel orbicularem ęmulantem. </
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<
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rum tamen eſt, quòd huiuſmodi operatio effici nullo
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modo poteſt abſque commotione, vertigine, &
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trãſ-poſitione
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poſitione</
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minimarum partium metalli, vel vitri, ſed
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non indè euincitur fluiditatem in tali caſu abſolutè
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dependere à prædicta commotione partium, niſi ex
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accidenti, quatenus non poſſunt ſegregari, & fluere
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particulæ aſperæ, & anguloſæ ferri, vel vitri abſque
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ſuperabundanti, & vehementi profluuio ignis, à quo
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demùm particulæ ipſæ ſolidæ lubricitatem, &
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acquirunt. </
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<
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mento adducto à doctiſſimo Roberto Boile quando
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alabaſtri
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ab igne feruenti fluxibilitatem ac
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quiſiuiſſe ait, at poſtmodum quælibet particula eiuſ
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dem fluoris ſupra papyrum refrigerata reperiebatur
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aggeries arenularum minutiſſimarum, neque concre
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tum, & ſolidum corpus efficiebat, vt in vitro, & fer-</
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