Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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quò magis comprimitur, ſcilicèt quò magis à circu
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lo recedit eius baſis, & ad figuram longiorem ellip
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ticam redigitur. </
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<
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aerei, ſi nimirùm concipiatur inuolucrum factum ex
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lamina tenuiſſima, quæ quidem paritèr flexibilis ſit,
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& ad modum arcus reſilire valeat, hæc, inquam, mul
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tò magis comprimi poteſt, & ad minus ſpatium redi
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gi, quam ſimplex tubus paulò ante expoſitus, quią
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nimirùm internus ambitus adhùc conſtringi, & immi
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nui poteſt, vt nimirùm perimeter baſis minor fiat, re
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petitis nimirum conuolutionibus prædicti inuolucri,
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& præterea, non minùs, quam antea poteſt laterali
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tèr comprimi vt nimirùm baſis non circularis, ſed el
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liptica fiat, & ſic duplicata cauſa reſtrictionis mul
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tò magis minui poterit moles aeris conſtipati con
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denſatique; Tertiò ſi ſupponantur tubuli aerei com
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poſiti ex tenuiſſima virga ramoſa, vel faſcia obliquè
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reuoluta, & in ſe ipſam circumducta ad modum ſpi
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ræ, relictis nimirùm aliquibus interſtitijs inter tranſ
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uerſales ſpiras, tunc quidem multò faciliùs tubulus
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prædictus conſtipari poterit tribus nominibus, &
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quia ambitus internus imminuitur, pariterque decur
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tatur altitudo fiſtulæ, & tandem ad figuram compreſ
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ſam ellipticam redigitur, quare ſi ſolida materia præ
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dicti tubuli, ſeù ſpiræ ſit dura quidem, ſed flexibilis,
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& apta ad reſiliendum vt machina, vel arcus chali
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beus, eique naturalitèr competat ampla, & dilatatą
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figura, poterunt profectò
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ab externa vi, at
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ceſſante violentia
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ſua reſilient, ad prioremque </
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