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

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            <s xml:id="echoid-s11239" xml:space="preserve">
              <pb o="311" file="0417" n="455" rhead="MATHEMATICA. LIB. II. CAP. XVI."/>
            tubum D communicationem habent cum antliis. </s>
            <s xml:id="echoid-s11240" xml:space="preserve">Da-
              <lb/>
            tur enim infra laminam L L, cavitas quæ tubo E E reſpon-
              <lb/>
            det, in quo duo dantur epiſtomia, inter quæ cum tubo
              <lb/>
            hoc conjungitur tubus OO, qui infra laminam, cui antliæ
              <lb/>
            imponuntur, cum his communicatur.</s>
            <s xml:id="echoid-s11241" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s11242" xml:space="preserve">Antliæ ſingulæ epiſtomium infra fundum ſuum habent,
              <lb/>
            horum caudæ videntur in G, G, quæ regulis æneis ad ſe
              <lb/>
            invicem applicatis junguntur ita, ut motu harum regularum
              <lb/>
            epiſtomia ambo eodem tempore moveantur. </s>
            <s xml:id="echoid-s11243" xml:space="preserve">Inter regulas,
              <lb/>
            in medio longitudinis, rotula ænea datur T. </s>
            <s xml:id="echoid-s11244" xml:space="preserve">Cum a-
              <lb/>
            xe rotæ R a poſtica parte jungitur crux ferrea HKNM,
              <lb/>
            qua epiſtomia hæc agitantur.</s>
            <s xml:id="echoid-s11245" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s11246" xml:space="preserve">In ſitu in quo partes machinæ in his figuris repræſentan-
              <lb/>
            tur, antlia B cum vaſe exhauriendo communicationem ha-
              <lb/>
            bet, antlia A cum aëre externo; </s>
            <s xml:id="echoid-s11247" xml:space="preserve">& </s>
            <s xml:id="echoid-s11248" xml:space="preserve">deprimendo hujus an-
              <lb/>
            tliæ embolum omnis aër ex hac ejicitur, & </s>
            <s xml:id="echoid-s11249" xml:space="preserve">interea magis
              <lb/>
            elevatur embolus alter.</s>
            <s xml:id="echoid-s11250" xml:space="preserve"/>
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          <p>
            <s xml:id="echoid-s11251" xml:space="preserve">Ubi verò embolus fundo antliæ A applicatur, extremi-
              <lb/>
            tas N crucis ad n pertingit, in quo motu ſuper rotulâ
              <lb/>
            T tranſit, hancque in motu radit; </s>
            <s xml:id="echoid-s11252" xml:space="preserve">Eo autem momento
              <lb/>
            quo N tranſit ſuper T, clavus, aut cylindrus, ferreus K,
              <lb/>
            ad vectem CF, ferreum, incurvatum, circa P mobilem,
              <lb/>
            in b accedit; </s>
            <s xml:id="echoid-s11253" xml:space="preserve">huncque premit in motu puncti N à T ad n.</s>
            <s xml:id="echoid-s11254" xml:space="preserve"/>
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            <s xml:id="echoid-s11255" xml:space="preserve">Rotatur interea vectis circa centrum P, & </s>
            <s xml:id="echoid-s11256" xml:space="preserve">extremitas F
              <lb/>
            in rotulam T premit, hancque elevat; </s>
            <s xml:id="echoid-s11257" xml:space="preserve">quo ſitus epiſto-
              <lb/>
            miorum paululum quidem mutatur, non tamen me-
              <lb/>
            moratæ communicationes antliæ B cum vaſe exhauriendo,
              <lb/>
            & </s>
            <s xml:id="echoid-s11258" xml:space="preserve">A cum aëre externo, obturantur.</s>
            <s xml:id="echoid-s11259" xml:space="preserve"/>
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          <p>
            <s xml:id="echoid-s11260" xml:space="preserve">Motus rotæ nunc in contrariam partem dirigendus eſt.
              <lb/>
            </s>
            <s xml:id="echoid-s11261" xml:space="preserve">Ubi in reditu punctum N ab n ad T pervenit, quia rotula
              <lb/>
            elevata fuit, in hanc incurrit crucis extremum, trochleam-
              <lb/>
            que propellit, donec converſione epiſtomiorum G, G, ita
              <lb/>
            deprimatur, ut ſuper hac tranſeat N.</s>
            <s xml:id="echoid-s11262" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s11263" xml:space="preserve">In hac epiſtomiorum converſione, G, G, arcus deſcri-
              <lb/>
            bunt, qui paululum tantum excedunt gradus nonaginta;</s>
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