Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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horizontaliter conſtitutum, ſuſpenſum, & alligatum
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in centro C & pondus vniuerſum applicatum eritiņ
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centro D extremo fili, vel lineæ CD: ſed penduli na
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tura talis eſt vt conetur deorſum ferri per arcum qua
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drantis DE circa centrum eius fixum C vſque ad lo
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cum infimum E, quod magis ad centrum terræ appro
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ximatur, quàm in ſitu horizontali D & patet quòd
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vniuerſa hæc operatio neceſſaria, & naturalis eſt de
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pendens à deſcenſu totius grauis. </
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<
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">& eſt impoſſibilę
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vt fune pendulum CD ad in fimum ſitum CE perduca
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tur abſque eo quòd libra rigida ſitum perpendicula
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rem ad horizontem acquirat, quale eſt GCF, hoc ve
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ro minimè acquiri poteſt niſi pars minus grauis libræ
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B ſurſum aſcendat per arcum BF, igitur caſus, & de
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ſcenſus totius corporis grauis AB à ſitu eleuato D ad
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infimum E eſt vera & legitima cauſa aſcenſus corpo
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ris grauis B per arcum BF, quod fuerat oſtendendum. </
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Cap. 2. dę
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momentis
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grauium in
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fluido inna
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tantium</
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<
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plex caſus, aut deſcenſus
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corporis grauis eſt vera,
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& legitima cauſa motus,
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& aſcenſus alicuius partis
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eius ſurſum, & hoc planè
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contingit quotieſcumque
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graue vniuerſum ſuſtine
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tur ab aliquo eius puncto libræ realis, vel imagina
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riæ, it aut efficiatur commotio omnium partium eius
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non quidem per lineas rectas inter ſe parallelas, &
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horizonti perpendiculares, ſed vertiginoſas, & cir-</
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