Iordanus <Nemorarius>
,
Liber Iordani Nemorarii viri clarissimi de ponderibus propositiones XIII & earundem demonstrationes, multarumque rerum rationes sane pulcherrimas completens, nunc in lucem editus
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">PROPOSITIO PRIMA.
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<
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>Inter quælibet duo gravia est velocitas descenden
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do proprie, et ponderum eodem ordine sumpta pro
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portio, descensus autem, et contrarii motus, proportio eadem, sed permutata.
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Dicitur proprie, ut excludantur omnes velocitates, quoquo modo
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præter naturam acquisitæ.</
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prie precisa causa sit pondus, patet, quo ad multiplicationem ponderis
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sequitur velocitatis multiplicatio.</
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id
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">Secunda pars patet, quia eadem est
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proportio descensus et ascensus, sed contrarie sumitur proportio hic
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et ibi, propter quod dicitur permutata.</
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<
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pondus, ita aliud pondus in ascensu, quia eiusdem proportionis est di
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stantia gravis in descendendo in circulo superiori, sicut ascensus ab infe
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riori, eadem igitur est proportio, sed permutata.</
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">Oportet enim, quanto illud exce
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dit, tanto id isto excedi.</
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<
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>Et per consequens, quanto illud quod est gravi
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us, velocius ascendit, tanto levius movetur contrarie.</
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>[commentary not transcribed]</
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