Casati, Paolo, Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="018/01/080.jpg" pagenum="72"/>
              operæ pretium ſit. </s>
              <s>Latus vnum Quadran­
                <lb/>
              tis ita duplico, vt iam perpendiculum non
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              ex circuli centro, ſed ab extremâ diametro
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              pendeat, & obſeruationem inſtituo: hinc
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              enim ſæpiùs fit, vt ſilum ſericum crudum,
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              ex quo pilula plumbea ſuſpenditur, minùs
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              obliquè lineam minutorum ſecet, quàm ſi
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              ex centro penderet: Et quoniam angulus ad
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              peripheriam ſubduplus eſt anguli ad cen­
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              trum, notæ verò graduum & minutorum̨
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              Quadrantis limbo appoſitæ indicant angulos
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              ad centrum, angulus à perpendiculo nota­
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              tus, ex. gr. 1. 45 1/2, bifariam diuiditur, &
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              quæſitus angulus eſt, gr. o. m. 52. ſec. 45.
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              Quare ſi qua labes obſeruationi adhæreat,
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              pauculis ſcrupulis ſecundis definitur. </s>
            </p>
            <p type="main">
              <s>
                <emph type="italics"/>
              Merſ.
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              </s>
              <s> Dari id quidem facilè poteſt ſy­
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              derum obſeruatori; in tantâ nimirum diſtan­
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              tiâ ipſius organi magnitudo, quantacunque
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              demùm illa ſit, planè euaneſcit; ac proinde
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              iſta, vt ita dicam, virtualis duplicatio Qua­
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              drantis nihil officit. </s>
              <s>At verò telluris ma­
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              gnitudinem indaganti ex radio optico, res
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              non ita in plano eſt: ſi enim oculum centro
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              Quadrantis admoueas ita, vt latus alterum
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              inſtrumenti congruat lineæ visûs, reliquum
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              verò latus fuerit, vt dicebas, duplicatum;
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              angulus à perpendiculo & lineâ visûs ex cen­</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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