Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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53.) conatus, & impetus totalis, quo ignis per mer
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curium aſcendit, vel terra per ignem deſcendit, men
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ſurari debet ab aggregato virium extremarum, ſci
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licet à tota vi leuitatis cum tota vi grauitatis, quarę
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totalis impetus erit octo graduum. </
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<
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">Sed hoc eſt fal
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ſum, contra aduerſarij aſſertionem, & contra Archi
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medem, ea enim, quæ in fluido eleuantur, tanta vi
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aſcendunt, quanta eſt grauitas qua moles fluidi mer
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curialis æqualis corpori igneo intra ipſum demerſo
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ſuperat huius grauitatem, quæ nulla eſt, & proindè
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ignis impetu quatuor graduum per mercurium
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dit</
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, quaproptèr non fertur ignis ſursùm à vi eius le
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uitatis, & ideò leuis non erit, quod erat &c.
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Suppoſitio
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nes aliquæ
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peripatetice
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recenſentur.</
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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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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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Dubitatur
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de menſura
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gradus præ
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dicti impe
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tus.</
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<
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">Sed inſtabit denuò peripateticus, dicetque, quòd
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ea velocitas, quæ exercetur ab igne aſcendente per
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mercurium, aut à terra deſcendente per ignem po
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terit cenſeri octo graduum, vel quatuor ad libitum,
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quia non habemus certam menſuram vnius gradus
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impetus, & ſic mediante ſenſu, & experientia non
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poteſt eius ſententia redargui. </
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PROP. LVI.
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Reperire menſuram certi gradus impetus reſpectu cuius di
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ſcerni valeat an impetus deſcenſus terræ per ignem,
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vel aſcenſus ignis per mercurium ſit octo, vel
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quatuor graduum.
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<
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perimentum non in mercurio ſimplicitèr graui, </
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