Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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verò villi non eſt impoſſibile, vt in interna ampla ca
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uitate cylindrulorum, vel ſpirarum, ramos proten
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dant, itaut internè habeant veluti capillitium com
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poſitum ex villis flexibilibus, & reſilientibus ad mo
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dum machinæ, eiuſdem naturæ, ac eſt tota aeris ſub
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ſtantia, & non minus quam habet aquæ capillitium,
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ſed oportet vt villi interni aereorum inuolucrorum̨
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facilè poſſint à calido molleſcere, vt omninò flectan
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tur, & rigiditatem amittant, & è contra à frigido, ſeù
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à defectu caliditatis rigiditatem, & tenſionem eius
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naturalem reaſſumant, & acquirant; cuius rei non de
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ſunt exempla in natura; videmus enim
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, metalla,
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& innumera alia concreta, quæ à caliditate, ſcilicèt
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ab incurſu igniculorum mollia, cedentia, & flexilia
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redduntur; è contra diſcedente caliditate ſpontę
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ſua priſtinam duritiem, tenſionemque acquirunt: non
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igitur erit impoſſibile, vt eiuſdem naturæ ſint villi,
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qui intra tubulorum aereorum capacitatem
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diramã-tur
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tur</
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, protendunturque. </
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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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PROP. CCLXXV.
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His præmisſis inquirenda eſt ratio, & cauſa quare aqua in
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actu congelationis rarefit,
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ampliorẽque
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molem acquirit.
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<
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exurgunt de nouo intra aquę ſubſtantiam innu
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meræ ampullæ aere plenæ, quæ prius non
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:
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hæ procùl dubio non adueniunt deforis, ſed origi
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nem, & ortum habere videntur in ipſamet aqua, vt
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dictum eſt: & quia ridiculum eſt à frigore intra gla
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ciem de nouo aerem gigni, fatendum eſt aeris innu-</
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