Gravesande, Willem Jacob 's, Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1

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          <pb o="261" file="0359" n="393" rhead="MATHEMATICA. LIB. II. CAP. XI."/>
          <p>
            <s xml:id="echoid-s9577" xml:space="preserve">Uſu veniunt in experimentis, quæ hac Machinâ inſtituun-
              <lb/>
            tur, globi, cylindri, & </s>
            <s xml:id="echoid-s9578" xml:space="preserve">coni varii, qui ſinguli capillis equi-
              <lb/>
            nis ſuſpenduntur; </s>
            <s xml:id="echoid-s9579" xml:space="preserve">in qua ſuſpenſione reſpectu cylindrorum
              <lb/>
            & </s>
            <s xml:id="echoid-s9580" xml:space="preserve">conorum attendendum, ut axem habeant verticalem, & </s>
            <s xml:id="echoid-s9581" xml:space="preserve">
              <lb/>
            conorum vertices ſurſum dirigantur.</s>
            <s xml:id="echoid-s9582" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s9583" xml:space="preserve">An aperturæ epiſtomiorum eſſent exactæ, ut explorarem,
              <lb/>
            & </s>
            <s xml:id="echoid-s9584" xml:space="preserve">errores corrigerem, methodo uſus ſum, quam nunc
              <lb/>
            exponam.</s>
            <s xml:id="echoid-s9585" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s9586" xml:space="preserve">Rebus ut explicavi diſpoſitis, in T applicato tubo, cujus
              <lb/>
              <note position="right" xlink:label="note-0359-01" xlink:href="note-0359-01a" xml:space="preserve">903.</note>
            diameter erat hypotenuſa trianguli rectanguli iſoſceles, cu-
              <lb/>
            jus latera ſuntduorum pollicum, arcam AB aquâ replevi ita,
              <lb/>
            ut oræ arcæ duobus tantum pollicibus aquam ſuperarent,
              <lb/>
            quo etiam F & </s>
            <s xml:id="echoid-s9587" xml:space="preserve">T repleta fuere.</s>
            <s xml:id="echoid-s9588" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s9589" xml:space="preserve">In tubo T, capillo equino cylindrum ſuſpendi æneum, cujus
              <lb/>
            diameter pollicem fere quartâ parte excedit, & </s>
            <s xml:id="echoid-s9590" xml:space="preserve">cujus altitudo
              <lb/>
            eſt ſeſqui pollicis, ſuprema ſuperficies paululum convexa eſt,
              <lb/>
            & </s>
            <s xml:id="echoid-s9591" xml:space="preserve">cavus ipſe eſt, ut minusgravet libram, & </s>
            <s xml:id="echoid-s9592" xml:space="preserve">exacte clauſus,
              <lb/>
            ne aqua in ipſum penetrare poſſit: </s>
            <s xml:id="echoid-s9593" xml:space="preserve">capillus equinus cum unco k
              <lb/>
            lancis libræ V cohærebat, & </s>
            <s xml:id="echoid-s9594" xml:space="preserve">pondere lanci oppoſitæ
              <lb/>
            impoſito dabatur æquilibrium.</s>
            <s xml:id="echoid-s9595" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s9596" xml:space="preserve">Quæſivi quodnam pondus adjiciendum eſſet, ut æqui-
              <lb/>
            librium daretur, aperto uno ex epiſtomiis minoribus; </s>
            <s xml:id="echoid-s9597" xml:space="preserve">de-
              <lb/>
            tegitur pondus hoc tentando; </s>
            <s xml:id="echoid-s9598" xml:space="preserve">Primo pondus ad libitum
              <lb/>
            imponitur, libraque manu in ſitu æquilibrii retinetur, &</s>
            <s xml:id="echoid-s9599" xml:space="preserve">,
              <lb/>
            poſt apertum epiſtomium, relinquitur; </s>
            <s xml:id="echoid-s9600" xml:space="preserve">ſi libra moveatur,
              <lb/>
            pro diverſo motu augetur, aut minuitur, pondus, & </s>
            <s xml:id="echoid-s9601" xml:space="preserve">eadem
              <lb/>
            operatio repetitur, donec, relictâ bilance, hæc in æqui-
              <lb/>
            librio maneat, habemuſque tunc pondus quod valet actio-
              <lb/>
            nem quam aqua, dum per tubum movetur, in corpus exerit.</s>
            <s xml:id="echoid-s9602" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s9603" xml:space="preserve">Hac methodo detexi, apertis ſucceſſive epiſtomiis mino-
              <lb/>
            ribus, parum actiones differre; </s>
            <s xml:id="echoid-s9604" xml:space="preserve">ideoque non exactiſſime æ-
              <lb/>
            quales eſſe aquæ quantitates per ſingula effluentes, qui er-
              <lb/>
            ror facillime paululum admodum aucto foramine uno cor-
              <lb/>
            rectus fuit.</s>
            <s xml:id="echoid-s9605" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s9606" xml:space="preserve">Apertis tunc ambobus his epiſtomiis I, L, ſimul, ut </s>
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