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

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                ideo, et pondus in, h, ad pondus in d, contin
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                gens b, f, in e, u, m, transeatque linea e, u,
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                p, et ducantur perpendiculares f, r, f, x,
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                ad b, a, b, c. </s>
                <s id="id.2.28.02.04">
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                Quia igitur ponderis e, b,
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                ad pondus f, b, ut l, b, ad r, b, siue x, b, ad
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                p, b, a puncta f, et e, aequedistent (ex
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                hypothesi) a punctis c, et a, siue a puncto
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                d, pondusque f, b, in u, ad pondus eius in f,
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                sicut f, b, ad u, b, siue r, b, ad m, b. </s>
                <s id="id.2.28.02.05">Et quia
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                x, p, ad p, b, sicut r, b, ad m, b, erit pon­
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                dus e, b, ad pondus f, b, sicut pondus f, b,
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                in u, pondus eius in f, tantum ergo est
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                pondus e, b, in e, quám f, b, in u, quia figu
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                rae, a, b, p, est similis figurae, f, r, b, c, (quod
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                facile probabis) et figura a, u, m, b, p, circa diametrum f, b, (per sextum Eu
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                clidis) erit similis eisdem. </s>
                <s id="id.2.28.02.06">Ideo sicut b, l, ad b, r, sic b, r, ad b, m, et ideo si­
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                cut b, e, in e, ad pondus b, f, m, f, sic erit idem pondus f, b, in u, ad idem pon­
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                dus f, b, in f, et ideo (per quintam Euclidis) pondera e, b, in e, et b, f, in u,
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                erunt aequalia. </s>
                <s id="id.2.28.02.07">Quod autem in e, sit leuius, quám in h, probatur quia d,
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                h, est longior, et est etiam d, r, maior, quám e, z, et angulus b, e, 3, minor
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                angulo u, k, z.
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                </s>
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                <s id="id.2.29.00.01">Quaestio uigesimaoctaua.
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                <s id="id.2.29.01.01">Mundus non in medio descen­
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                dens breuiorem partem secundum
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                proportionem longioris ad ip­
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                sam grauitatem redditur.
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                </s>
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                In, quo suspenditur sit a, b, c, et pon­
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                dus e. </s>
                <s id="id.2.29.02.02">Diuidatur autem e, in d, ac f, ut
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                sit d, ad f, sicut a, b, ad b, c. </s>
                <s id="id.2.29.02.03">Si igitur su
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                spenditur d, in c, et f, in a,
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                tanti ponderis quodlibet eo­
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                rum, quanti e, intellecto quód
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                in opposita, sit quasi cen­
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                trum librae. substinentibus igi
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                tur in a, et c, pondus c, de­
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                pendens a, b, erit grauitas
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                in a, ad grauitatem c, sicut
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                c, b, ad b, a.</s>
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