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

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            <s xml:id="echoid-s5084" xml:space="preserve">
              <pb o="127" file="0191" n="208" rhead="MATHEMATICA. LIB. I. CAP. XXIII."/>
            pollicis æquales ſunt. </s>
            <s xml:id="echoid-s5085" xml:space="preserve">Horizonti regula hæc parallela eſt ut
              <lb/>
            & </s>
            <s xml:id="echoid-s5086" xml:space="preserve">ſuperſiciei ligni R, à quo diſtat tribus partibus quartis
              <lb/>
            unius pollicis. </s>
            <s xml:id="echoid-s5087" xml:space="preserve">Ut firmetur cohæret cum prominentiis t, t
              <lb/>
            quæ cochleis ad partem poſticam ligni K retinentur.</s>
            <s xml:id="echoid-s5088" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5089" xml:space="preserve">Regulæ huic unci junguntur quatuor Y, V, V, Y, di-
              <lb/>
            ſtantia inter medios V, V, eſt ſeſqui pollicis, hujuſque di-
              <lb/>
            ſtantiæ punctum medium datur in plano, quod concipitur per-
              <lb/>
            pendiculare ad ſuperficiem K & </s>
            <s xml:id="echoid-s5090" xml:space="preserve">per axem columnæ l tranſ-
              <lb/>
            it; </s>
            <s xml:id="echoid-s5091" xml:space="preserve">diſtantia Y Y eſt trium pollicum.</s>
            <s xml:id="echoid-s5092" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5093" xml:space="preserve">Juxta regulam hanc SS tubuli duo quadrati moventur, qui
              <lb/>
            ad libitum cochleis firmantur, & </s>
            <s xml:id="echoid-s5094" xml:space="preserve">cum quibus unci exigui,
              <lb/>
            ftatim memoratis ſimiles, cohærent. </s>
            <s xml:id="echoid-s5095" xml:space="preserve">Tand em in medio & </s>
            <s xml:id="echoid-s5096" xml:space="preserve">
              <lb/>
            in extremitatibus regulæ foramina dantur f, f, f, æqualiter a
              <lb/>
            ſe in vicem diſtantia, poſitis extremis a ſe mutuo remotis ſe-
              <lb/>
            ptem pollicibus cum ſemiſſe,</s>
          </p>
          <p>
            <s xml:id="echoid-s5097" xml:space="preserve">Ut in præcedentis machinæ deſcriptione monui, ſex de
              <lb/>
              <note position="right" xlink:label="note-0191-01" xlink:href="note-0191-01a" xml:space="preserve">
                <emph style="sc">TAB. XVIII</emph>
                <lb/>
              fig. 3.</note>
            ſiderantur globi eburnei diametri ſeſqui pollicis ut A. </s>
            <s xml:id="echoid-s5098" xml:space="preserve">Loco
              <lb/>
            majorum globorum utimur tribus cylindris eburneis quorum
              <lb/>
            diametri globorum diametris æquales ſunt. </s>
            <s xml:id="echoid-s5099" xml:space="preserve">Duorum ſectio
              <lb/>
            per axem repræſentatur in C; </s>
            <s xml:id="echoid-s5100" xml:space="preserve">tertii ſectio datur in B; </s>
            <s xml:id="echoid-s5101" xml:space="preserve">cy-
              <lb/>
            lindri B pondus duplum eſt ponderis globi A ejuſdem dia-
              <lb/>
            metri cum cylindro; </s>
            <s xml:id="echoid-s5102" xml:space="preserve">cylindrorum ſingulorum ut Cpondera
              <lb/>
            tripla ſunt ponderum globorum.</s>
            <s xml:id="echoid-s5103" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5104" xml:space="preserve">In his cylindris cavendum ut axis dentis eburnei, ex
              <lb/>
            quo formantur, perpendiculariter ſecet axem cylindri cir-
              <lb/>
            citer in hujus medio. </s>
            <s xml:id="echoid-s5105" xml:space="preserve">Ubi globus cum cylindro, aut duo
              <lb/>
            cylindri, ſimul machinæ applicantur cavendum ut convexi-
              <lb/>
            tas unius alterius planam ſuperficiem tangat.</s>
            <s xml:id="echoid-s5106" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5107" xml:space="preserve">Ex ebore, aut ligno duriore & </s>
            <s xml:id="echoid-s5108" xml:space="preserve">graviore, ulterius quatuor
              <lb/>
              <note position="right" xlink:label="note-0191-02" xlink:href="note-0191-02a" xml:space="preserve">
                <emph style="sc">TAB. XXIII</emph>
              .
                <lb/>
              fig. 4.</note>
            formantur cylindri, quorum duorum minorum ſectiones per
              <lb/>
            axem exhibentur in D, reliquorum in E, & </s>
            <s xml:id="echoid-s5109" xml:space="preserve">F.</s>
            <s xml:id="echoid-s5110" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5111" xml:space="preserve">Si ex ebore formentur ad ſitum axeos dentis non atten-
              <lb/>
            dimus, quia elaſticitate ſua in Experimentis non a-
              <lb/>
            gunt</s>
          </p>
          <p>
            <s xml:id="echoid-s5112" xml:space="preserve">Horum cylindrorum diametri ſunt etiam ſeſqui </s>
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