Jordanus de Nemore
,
[Liber de ratione ponderis]
,
1565
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lum ab f, et k, sed ab a, et d. </
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Quum enim non pos
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sit a, descendere i b, tendit et in e, quoniam liqui
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dum est similiter, et f, ab b, omni superiori graua
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tur, eo quód amplius quanto
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a, b, latius. quanto igitur plus nititur contra. k, et ideo amplius
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tardabitur descensus t, tertium grauitatis minuetur.
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Res grauior quo amplius descendit eo
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fit descendendo uelocior.
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habet enim aer ad omnes motus. </
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tur grauis descendens primo motu tra
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het posteriora, et mouet proxima inferio
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ra, et ipsa mota mouetur sequentia, ita ut
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illa mota grauitatem descendentem impe
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diat minus. </
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tia amplius impelli, ita ut iam non impellan
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tur, sed etiam trahant. </
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uitas tractu illorum adiuuatur et motus
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eorum grauitate ipsius augeatur, unde et
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uelocitatem illius continue multiplicare
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constat.
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Forma ponderosi mutat uirtutem ponderis.
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<
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id
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cilius pertransit, et hoc dicitur leuius
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enim separat, et sic fit leuius, minori
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etiam ostendit, minus quidem impeditur, et
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ob hoc etiam uelocius transit e, contra si ob
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tusum est.</
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