Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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183
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dri extremitas C termino H trochleæ, vel libræ HK
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radiorum æqualium, cuius centrum I, & reliquo ex
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tremo K ſuſpendatur pondus N æquale grauitati ab
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ſolutæ cylindri AC. profectò manifeſtum eſt ſenſui
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non ſufficere pondus N ad ſeparandum, & diuellen
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dum cylindrum AC à pauimento DE, ſed requiritur
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aliqua vis multò maior illa, quæ reperiri
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aſſignariq;
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poterit, non enim eſt infinita, igitur ſi addatur con
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tinentèr pondus ponderi termino K
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tãdem
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deuenie
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mus ad pondus aliquod, vt eſt O à quo cvlindrus CA
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directa tractione diuelli à pauimento poterit. </
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<
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verò duo pondera N, & O directè diuellunt
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cylindrũ
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AC, & hic reſiſtit ſeparationi duabus viribus, pro
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prij ſcilicèt ponderis æqualis nempè ipſi N, & vi
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contactus, & repugnantiæ ad vacuum
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admmittendũ
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.
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</
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<
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id
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">igitur remanens vis ponderis O æqualis erit, & aucta
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ſuperabit vim connexionis duarum ſuperficierum ſe
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mutuò exquiſitè tangentium. </
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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Sup. 8.</
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">Non defuit tamen qui hunc progreſſum in
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abbr
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dubiũ
">dubium</
expan
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reuocare auſus ſit, & ſic inutilem, ac inefficacem vni
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uerſam demonſtrationem ſubſequentem redderę,
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quę in prædicta experimentali operatione fundatur.
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<
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">Nucleus difficultatis talis eſt, non videri poſſibilę
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columnam AC vnquam poſſe motu tàm directo ſur
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sùm trahi, nec libra, nec trochlea itaut non flectatur
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inclineturque, & hoc (inquiunt) nullo pacto huma
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na diligentia aſſe qui poſſe; imò aſſerere auſi ſunt,
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quòd ſi funis HC directè traheretur perpendiculari
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tèr nimirùm ad planum horizontis, & ad baſim DE </
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