Borro, Girolamo
,
De motu gravium et levium
,
1575
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121
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cu, motum peragit niſi per aerem, qui ab arcus corda motio
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nem accipit, & ſagittæ adest vt motor quieſcente corda quouſ
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que motus, quem a corda ſuſcepit, diſpereat: idque aeri ideo
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accidit; quia leuis eſt, & grauis ſimul: in loco ignis eſt grauis,
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in loco terræ, & aquæ est leuis, in ſuo proprio, ac naturali lo
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co nec leuis eſt, nec grauis: & tunc ineſt ei facultas ſuſcipien
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di motionis principium ſurſum, & deorſum: quia omne ſuſci
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piens debet eſſe denudatum à natura ſuſcepti, intus enim exi
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ſtens prohibet, & obſiſtit: vt dictum eſt ab Aristotele libro
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tertio de anima particula quarta. </
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id
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">Idcirco aer organum fit
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motus naturalis, & violenti: naturalis quidem eo quod mo
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tui naturali patrocinium, facilitatemque miniſtrat: violenti
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autem: quia mobili vim, & impetum addit; ſi quidem violen
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ter mota ſeiunto ab eis motore, motum continuare
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queant,
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niſi propter hanc aeris naturam. </
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id
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">Eadem est aquæ naturæ,
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ac diſpoſitio, quam aeris fuiſſe diximus, licet minus virium ha
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beat ad hoc, quam aer: quia est aere crassior eam ob rem mo
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tori magis reſiſtit; & motum ſegniorem efficit.
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Hæc Auerrois ferè ad verbum: ex quibus elicere poſſu
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mus; hanc, tum ipſius Auerrois, cum etiam Ariſtotelis ge
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minam, atque germanam fuiſſe ſententiam, qua inuenta,
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probare contendimus elementa ſcilicet in medio, & à medio
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certè moueri.
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Modus, quo elementa à medio mouentur, explicatus est
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ab Auerroe tertio libro de cælo commentatione vigeſimaocta
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ua exemplo nautæ: qui dum nauigium ex arte mouet, ſemet
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ipſum etiam cum moto nauigio mouet: ita, vt elementum mo
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uendo medium, moueat ſe admotum medii, ſicut nauta mo
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uendo nauem, mouet ſe ad motum nauis. </
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<
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">Quo locus iſtæ melius
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intelligatur, ſciendum eſt: medium ab impellente pulſum mo
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