Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ſiores reddi poſſe, & è contra à caliditate molliores,
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& flexiliores effici. </
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<
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">His poſitis, quia dùm aqua fluida
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eſt, caliditas in aqua viget, & proindè villi interni
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ſpirarum, ſeù tubulorum
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molliores, flexilio
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reſque redditi facilè cedere poſſunt vi ponderis flu
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entis aquæ, ideò tubuli prædicti repleri poſſunt;
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adueniente poſtea ingenti gradu frigoris, nempè de
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ficiente copia igniculorum, ſponte ſua villi interni
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ſpirarum aeris tenſiores, directiores, & rigidiores
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reddi poſſunt, & ideò ad inſtar machinularum expel
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lere poſſunt ibidem contentas aquæ particulas, &
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proindè tubuli prædicti exinaniri poſſunt. </
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Cap. 13. cau
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ſa rarefacti
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onis glaciei
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affertur.</
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<
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">Poſtea quia dum efficitur huiuſmodi expulſio, non
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adhùc aqua congelata indurataque eſt, vel
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ma
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iori ex parte fluiditatem retinet, fit vt prædictæ ſpi
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ræ aereæ non vt priùs aqua impręgnatæ, ſed vacuæ
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relictæ, facilè poſſint ab ambiente fluido agitari, ex
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pellique, & ſic poſſunt plures ſpiræ aereæ coaceruari,
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& cum vicinis vniri, & ſic aliquas ampullas aereas
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conſpicuas componere poſſunt, & hæc erunt forſan
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grana illa aerea, quæ propè initium, & in actu con
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gelationis ibidem oriri videntur. </
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<
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id
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">Contra hanc theoriam dici poſſet, quòd particu
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læ ſpiritus vini, olei, & mercurij cùm exiguæ, & mi
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nutiores quam ſint aeris particulæ concedi debeant,
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non ſecùs, ac aqua intra tubulos aereos inſinuari poſ
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ſent, & hinc quoque ab eadem neceſſitate ſuperiùs
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expoſita valdè refrigeratis fluidis expelli quoque è
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tubulis prædictis deberent, proindeque fluida præ-</
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