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="018/01/083.jpg" pagenum="75"/>
              ſpeciebat, in qua aliquid occurrebat obſer­
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              uandum, axiculum ritè infigi curaui, circa
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              quem poſſet dioptra conuerti. </s>
              <s>Erat autem
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              animus parare regulam longam pedes 42,
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              cuius latitudo 4. digitos, craſſities autem̨
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              duos digitos obtineret; ſic enim fieri poſſe
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              ſperabam, vt latitudine in altitudinem con­
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              uersâ, regula non adeò grauis horizontali­
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              ter conſtituta, & ſecundum alteram extremi­
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              tatem axiculo inſerta, non ſinuaretur, nec
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              à ſuâ rectitudine deflecteret: cùm maximè
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              decreuiſſem ita illi aliam regulam breuiorem
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              ſubiicere, in modum vectis primi generis, vt
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              inferiorem regulam premens eleuarem ſu­
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              periorem, quæ circiter duas tertias ſuæ lon­
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              gitudinis partes (hoc eſt circiter pedem ab
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              axiculo, circa quem volueretur, trigeſimum)
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              ſuſtentata à ſuppoſito vecte non eſſet adeò
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              obnoxia inflexioni. </s>
              <s>Tum regulæ longitudi­
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              ne in pedes diſtinctâ; accipiendi erant pedes
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              41 2/3, vt eſſent in vniuerſum vnciæ 500; cum
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              enim pedis vncia ita ſenſibiliter in laminâ
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              metallicâ diuidi queat in particulas 50 vt ha­
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              beantur vnciæ particulæ centeſimæ, erat Ra­
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              dius circuli deſcribendi partium 50000, ſub­
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              duplus numeri, qui habetur in Canone Tri­
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              gonometrico communi. </s>
              <s>Quare ſi hoc Ra­
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              dio in plano verticali deſcribatur arcus, & </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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