Jordanus de Nemore, [Liber de ratione ponderis], 1565

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              <p>
                <pb xlink:href="049/01/008.jpg"/>
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          </chap>
          <chap>
            <subchap1>
              <p>
                <s id="id.2.1.00.01">Prima svppositio.
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                </s>
              </p>
              <p>
                <s id="id.2.1.01.01">Omnis ponderosi motum esse ad me­
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                dium uirtutemque ipsius esse potentia ad
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                inferiora tendendi uirtutem ipsius, siue
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                potentia possumus intelligere longitu­
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                dinem brachij librae, aut uelociter eius
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                quem probatur ex longitudine brachij
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                librae, et motui contrario resistendi. </s>
                <s id="id.2.1.01.02">Se­
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                cunda: Quód grauius est uelocius de­
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                scendere. </s>
                <s id="id.2.1.01.03">Tertia: Grauius esse in de­
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                scendendo quanto eiusdem motus ad medium rectior. </s>
                <s id="id.2.1.01.04">Quar­
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                ta: Secundum situm grauius esse cuius in eodem situ minus obli­
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                quus descensus. </s>
                <s id="id.2.1.01.05">Quinta: Obliquiorem autem descensus in ea
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                dem quantitate minus capere de directo. </s>
                <s id="id.2.1.01.06">Sexta: Minus graue
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                aliud alio secundum situm, quod descensum alterius sequitur
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                contrario motu. </s>
                <s id="id.2.1.01.07">Septima: Situm aequalitatis esse aequalitatem
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                angulorum circa perpendiculum, siue rectitudi
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                nem angulorum, siue aeque distantiam regulae su
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                perficiei Orizontis.
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                </s>
              </p>
            </subchap1>
            <subchap1>
              <p>
                <s id="id.2.2.00.01">Quaestio Prima.
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                </s>
              </p>
              <p>
                <figure id="id.049.01.008.1.jpg" xlink:href="049/01/008/1.jpg" number="1"/>
                <s id="id.2.2.01.01">Inter quaelibet grauia est uirtutis, et ponde­
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                ris eodem ordine sumpta proportio.
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                </s>
              </p>
              <p>
                <s id="id.2.2.02.01">Sint pondera a,b,c, leuius c, descendatque a,b, in d, et
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                c, in e. </s>
                <s id="id.2.2.02.02">Itaque ponatur a,b, sursum in f, et c,i,h. </s>
                <s id="id.2.2.02.03">Di­
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                co ergo quód quae proportio a,d, ad c,e, sicut a,b, pon
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                deris ad c pondus, quanta enim uirtus ponderosi tanta
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                descendendi uelocitas: at quae compositi uirtus ex uirtu
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                tibus componentium componuntur. </s>
                <s id="id.2.2.02.04">Sit ergo a, aequale c.
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                </s>
                <s id="id.2.2.02.05">Quae igitur uirtus a, eadem et, c. </s>
                <s id="id.2.2.02.06">Sit igitur proportio a,
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                b, ad c, minor quám uirtutis ad uirtutem. </s>
                <s id="id.2.2.02.07">Erit similiter
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                proportio a, b, ad a, minor proportio quám uirtutis a,b,
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                ad uirtutem a, ergo uirtutis a, b, ad uirtutem b, minor pro
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                portio quám a, b, ad b. per 30. quinti Euclidis quód est in
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                conueniens. </s>
                <s id="id.2.2.02.08">Similium igitur ponderum minor, et maior
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                proportio, quám uirtutum. </s>
                <s id="id.2.2.02.09">Et quia hoc inconueniens erit,
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                utrobique eadem ideo a, b, ad c, sicut a, d, ad c, e, et e, con
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                trario sicut c, b, ad a, f.</s>
              </p>
            </subchap1>
          </chap>
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