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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<
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et pondere et quantitate æqualia, appendantur, ita,
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ut alterum erigatur, et alterum orthogonaliter depen
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deat, ita etiam, ut termini dependentis, et medii alte
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rius, eadem sit a centro distantia, secundum hunc situm
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æque gravia fient.
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pendeat descensu verso, et sit terminus illius inæquali distantia a centro
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motus cum medio alterius, quia sicut illius extremum plus a centro di
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stat, ita istius medium.</
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<
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">probatur sic, Gravitas naturalis est æqualis utro
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bique propositum ut violentum, similiter, quia semicirculi sunt æquales,
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ergo æque gravia secundum situm sunt appensa.</
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