Guevara, Giovanni di, In Aristotelis mechanicas commentarii, 1627

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    <archimedes>
      <text>
        <body>
          <chap id="N10019">
            <p id="N12712" type="main">
              <s id="N12714">
                <pb pagenum="81" xlink:href="005/01/089.jpg"/>
              teſt alia ſumpta ex centro grauitatis, vt proprium eſt me­
                <lb/>
              chanicarum ſpeculationum. </s>
              <s id="N1271E">Porrò libræ iam explicatæ cen­
                <lb/>
              trum grauitatis eſt punctum in medio iugi intrapoſitum, vt
                <lb/>
              patet ex definitione. </s>
              <s id="N12725">Nam circa illud
                <expan abbr="vndiq.">vndique</expan>
              partes æqua­
                <lb/>
              lium ſunt momentorum. </s>
              <s id="N1272E">Quando autem libra eſt in Aequi­
                <lb/>
              librio conſtituta, huiuſmodi centrum coincidit in eandem
                <lb/>
              lineam perpendiculatem, in qua eſt centrum circumuolu­
                <lb/>
              tionis, ſeu axis ipſius libræ, ac centrum mundi; ſiue axis po­
                <lb/>
              natur ſupra, ſiue infra
                <expan abbr="iugũ">iugum</expan>
              , vt videre eſt in deſcriptis figuris.
                <lb/>
              </s>
              <s id="N1273E">Quo fit, vt libra in tali poſitione quieſcat; nam centrum
                <lb/>
              grauitatis per breuiorem lineam, qua fieri poteſt tendit ad
                <lb/>
              centrum mundi; nulla autem breuior eſt recta in ipſum ca­
                <lb/>
              dente. </s>
              <s id="N12747">Quando verò libra per depreſſionem vnius, & ele­
                <lb/>
              uationem alterius partis ipſius,
                <expan abbr="nõ">non</expan>
              manet in æquilibrio, tunc
                <lb/>
              centrum grauitatis conſtituitur extra perpendiculum, ſeu li­
                <lb/>
              neam prædictam cadentem ad centrum mundi per
                <expan abbr="cẽtrum">centrum</expan>
                <lb/>
              circumuolutionis ipſius libræ; ac propterea neceſſario ipſum
                <lb/>
              centrum grauitatis ſi ſupra eſt in parte eleuata, ablato pon­
                <lb/>
              dere partis oppoſitæ deſcendet, ac reuertetur in locum pri­
                <lb/>
              ſtinum, vt magis centro mundi appropinquetur per viam
                <lb/>
              qua poteſt. </s>
              <s id="N12762">Si verò infra eſt in parte depreſſa, etiam ſi pon­
                <lb/>
              dus ab illa auferatur, manebit; quia in illo ſitu ſimiliter &
                <lb/>
              adhuc magis appropinquatur centro mundi quo tendit. </s>
              <s id="N12769">Quę
                <lb/>
              omnia abſque alia figura perſpicua eſſe poſſunt ex deſcri­
                <lb/>
              ptis, ac fuſiùs, & exactiùs traduntur, cum à Guidone Vbaldo
                <lb/>
              tractatu de libra, tum à Bernardino Baldo in hac quæſtione,
                <lb/>
              qui tantam in centro grauitatis vim eſſe animaduertit ad
                <lb/>
              præponderandum, vt hinc colligat, libras quæ axem habent
                <lb/>
              ſupra iugum, non à quouis paruo pondere moueri, vel peni­
                <lb/>
              tus declinare, ſed ab eo
                <expan abbr="tantũ">tantum</expan>
              , quod ſuperet
                <expan abbr="reſiſtentiã">reſiſtentiam</expan>
              cen­
                <lb/>
              tri grauitatis, quę reſiſtentia proportionaliter eo maior ex­
                <lb/>
              peritur, quo minus grauitatis
                <expan abbr="cẽtrũ">centrum</expan>
              diſtat ab axe, ſeu centro
                <lb/>
              circa quod ipſa libra conuertitur, vt
                <expan abbr="ibidẽ">ibidem</expan>
              ipſe demonſtrat. </s>
            </p>
            <p id="N12790" type="main">
              <s id="N12792">Verum quamuis prædicta omnia vera ſint, adhuc tamen
                <lb/>
              aliquod deſideratur ad adæquatam omnino rationem tra­
                <lb/>
              dendam, cur axe exiſtente ſupra iugum, ſi eleuetur vna pars </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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