Guevara, Giovanni di, In Aristotelis mechanicas commentarii, 1627

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    <archimedes>
      <text>
        <body>
          <chap id="N10019">
            <p id="N13F15" type="main">
              <s id="N13F29">
                <pb pagenum="132" xlink:href="005/01/140.jpg"/>
              æquilibrio, quia non magis vna quam altera pars vtrinque
                <lb/>
              à perpendiculo DC grauitare poteſt. </s>
              <s id="N13F55">Quod ſi impulſus
                <lb/>
              quamuis perexiguus in ipſam rotam à motore incutiatur,
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              vt ex parte E verſus F, ſtatim pars vbi F nutabit ac pro­
                <lb/>
              pendet verſus B;
                <expan abbr="ſuoq.">ſuoque</expan>
              nutu, totam rotam ſecum trahet il­
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              luc. </s>
              <s id="N13F64">Nam quælibet vis poteſt æquiponderantia ab æquili­
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              brio dimouere. </s>
              <s id="N13F69">Semel autem mota ipſa rota, niſi impe­
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              diatur deinceps nutabit ad partem verſus quàm primò fuit
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              incitata; ideoque facilè vlterius atque vlterius mouebitur.
                <lb/>
              </s>
              <s id="N13F71">Quo enim vnumquodque vergit, mouetur ex facili, ſubdit
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              ipſe Philoſophus, ſicut vice verſa difficulter in contrarium;
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              vt fuſius conſtabit quæſt. </s>
              <s id="N13F78">31. </s>
            </p>
            <p id="N13F7B" type="main">
              <s id="N13F7D">Atque hæc dicta intelliguntur de motu rotæ, aut ſphæræ
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              ſuper planum horizonti paralellum. </s>
              <s id="N13F82">Nam ſuper planum
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              quodlibet decliue, euidentius idem conſtabit. </s>
              <s id="N13F87">Siquidem
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              demiſſa tantum rota, vel ſphæra ſuper illud, ſuo ſemper nu­
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              tu celerrimè deorſum rotando ſe conferet, imò in præceps
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              quandoque decurret. </s>
              <s id="N13F90">Cum enim huiuſcemodi corpora per
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              eam lineam maximè grauitent, quæ perpendiculariter ab
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              eorum centro tendit ad centrum mundi, ſi ſuper decliue
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              planum conſtituantur, nequibunt ſecundum eandem li­
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              neam fulciri, ac ſuſtineri ab ipſo plano. </s>
              <s id="N13F9B">Nam punctum cir­
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              cumferentiæ per quod ipſa linea cadit ad centrum mundi,
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              & cui totum ferè onus incumbit, ſemper manebit ſuſpen­
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              ſum ſupra planum ex parte inferiori ipſius, nec vnquam
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              planum ipſum decliue continget. </s>
              <s id="N13FA6">Circulus enim vel glo­
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              bus non tangit planum, niſi in puncto in quod eius diame­
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              ter incidit ad angulos rectos; quo ſanè pacto cadere non
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              poteſt perpendicularis tendens ad mundi centrum in pla­
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              num, quod non eſt horizonti paralellum. </s>
              <s id="N13FB1">Cumque præ­
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              dictum punctum, cui potiſſimum onus incumbit, ſuſtineri
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              non poſſit ab eo, quod non contingit; hinc fit, vt ſemper
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              verſus inferiores partes decliues propendat, ac nutet, de­
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              feratque propterea ipſa orbiculata corpora quouſque ab
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              alio fulciatur. </s>
              <s id="N13FBE">Vt perſpicuè apparebit in propoſita ſphæra </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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