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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    <archimedes>
      <text>
        <body>
          <chap>
            <pb xlink:href="050/01/008.jpg"/>
          </chap>
          <chap>
            <p type="main">
              <s id="id.0.0.18.01.prop">PROPOSITIO PRIMA.
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              </s>
              <s>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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              </s>
            </p>
            <p type="main">
              <s id="id.0.0.19.01">
                <figure id="id.050.01.008.1.jpg" xlink:href="050/01/008/1.jpg" number="2"/>
              Dicitur proprie, ut excludantur omnes velocitates, quoquo modo
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              præter naturam acquisitæ.</s>
              <s id="id.0.0.19.02">Prima pars patet, quia cum velocitatis pro­
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              prie precisa causa sit pondus, patet, quo ad multiplicationem ponderis
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              sequitur velocitatis multiplicatio.</s>
              <s id="id.0.0.19.03">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.</s>
              <s id="id.0.0.19.04">Sicut enim se habet in descensu
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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.</s>
              <s id="id.0.0.19.05">Oportet enim, quanto illud exce­
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              dit, tanto id isto excedi.</s>
              <s>Et per consequens, quanto illud quod est gravi­
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              us, velocius ascendit, tanto levius movetur contrarie.</s>
            </p>
            <p type="main">
              <s>[commentary not transcribed]</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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