Guevara, Giovanni di, In Aristotelis mechanicas commentarii, 1627

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      <text>
        <body>
          <chap id="N10019">
            <pb pagenum="55" xlink:href="005/01/063.jpg"/>
            <p id="N11B53" type="head">
              <s id="N11B55">DE LIBRA.</s>
            </p>
            <p id="N11B58" type="main">
              <s id="N11B5A">Libra, quæ inter mechanica inſtrumenta iure
                <lb/>
              primum ſibi vendicat locum, eo quod imme­
                <lb/>
              diatius, ac magis participet
                <expan abbr="naturã">naturam</expan>
              circuli in
                <lb/>
              ſuis motionibus, eſt
                <expan abbr="iugũ">iugum</expan>
                <expan abbr="quoddã">quoddam</expan>
              ex medio
                <lb/>
              liberè ſuſpenſum,
                <expan abbr="axeq.">axeque</expan>
                <expan abbr="ſuffultũ">ſuffultum</expan>
              , ac plano ho­
                <lb/>
              rizontis
                <expan abbr="parallelũ">parallelum</expan>
              , ex cuius
                <expan abbr="vtraq;">vtraque</expan>
              extremitate gemina lanx
                <lb/>
              pendet,
                <expan abbr="cuiusq.">cuiusque</expan>
              conuerſione circa ipſum axem, dum altera
                <lb/>
              eleuatur, altera deprimitur, póndus vel exceſſus
                <expan abbr="põderis">ponderis</expan>
              cu
                <lb/>
              iuſlibet, deprehenditur, ac menſuratur. </s>
              <s id="N11B91">Qua in deſcriptione
                <lb/>
              ſupponitur
                <expan abbr="iugũ">iugum</expan>
              ex medio, trutina, ſeu axe ſuſpenſum, conſti­
                <lb/>
              tui, ac manere parallelum plano horizontis propter
                <expan abbr="æqui-ponderantiã">æqui­
                  <lb/>
                ponderantiam</expan>
              vtriuſque medietatis:
                <expan abbr="motumq.">motumque</expan>
              circularem, ſeu
                <lb/>
                <expan abbr="conuerſionẽ">conuerſionem</expan>
              circa fulcimentum tanquam circa
                <expan abbr="centrũ">centrum</expan>
              im­
                <lb/>
              motum, non niſi ratione
                <expan abbr="inæqualiũ">inæqualium</expan>
                <expan abbr="ponderũ">ponderum</expan>
              in gemina lance
                <lb/>
              vtrinque pendentium illi competere: vnde ſi pondera ſint
                <lb/>
              æqualia, libra ſemper maneat, & in æquilibrio conſtituatur,
                <lb/>
              ſeu æquidiſtans à plano horizontis. </s>
              <s id="N11BBF">Deinde ita ſupponitur,
                <lb/>
              pondera in lancibus impoſita, ex vtraque iugi extremitate
                <lb/>
                <expan abbr="pẽdere">pendere</expan>
              , vt hoc non ſit
                <expan abbr="neceſſariũ">neceſſarium</expan>
              ,
                <expan abbr="neq;">neque</expan>
              eſſentialiter pertineat
                <lb/>
              ad
                <expan abbr="conſtitutionẽ">conſtitutionem</expan>
              libræ, ſed potius ad
                <expan abbr="commoditatẽ">commoditatem</expan>
              ponde­
                <lb/>
              randi, cum ſatis intelligatur libra eſſentialiter conſtituta
                <lb/>
              etiam abſque lancibus, ponderibus in ipſis iugi extremita­
                <lb/>
              tibus, adiacentibus, vt cernere eſt in ſequentibus figuris. </s>
            </p>
            <p id="N11BE1" type="main">
              <s id="N11BE3">Quo autem pacto libra in ſui motione participet natu­
                <lb/>
              ram circuli per ſe conſtat conſideranti, iugum, diametri vi­
                <lb/>
              cem gerere, axem verò ſeu trutinam, aut
                <expan abbr="fulcimentũ">fulcimentum</expan>
              quod­
                <lb/>
              libet, centri locum tenere, circa quod immotum, ipſa dia­
                <lb/>
              meter vertitur dum circulum deſcribit; ſiquidem immoto
                <lb/>
              axe, ſeu fulcimento ipſius libræ, iugum, alterius extremita­
                <lb/>
              tis depreſsione ob exuperantiam
                <expan abbr="põderis">ponderis</expan>
              , alterius verò ele­
                <lb/>
              uatione, circumagitur, non ſecus ac diameter circulum
                <lb/>
              conficiendo. </s>
              <s id="N11BFE">Quod ſi partes iugi vtrinque à centro produ­
                <lb/>
              ctæ, non ſint inter ſe
                <expan abbr="lõgitudine">longitudine</expan>
              æquales, quamuis æquipon­
                <lb/>
              derantes; tunc quidem in ipſis iugi conuerſione, ac circum­</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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