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

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          <pb o="25" file="0057" n="58" rhead="MATHEMATICA. LIB. I. CAP. VIII."/>
        </div>
        <div xml:id="echoid-div188" type="section" level="1" n="66">
          <head xml:id="echoid-head112" xml:space="preserve">
            <emph style="sc">Phænomenon</emph>
          2.</head>
          <p style="it">
            <s xml:id="echoid-s1348" xml:space="preserve">Vis gravitatis ubique in Terræ viciniis, & </s>
            <s xml:id="echoid-s1349" xml:space="preserve">omnibus mo-
              <lb/>
              <note position="right" xlink:label="note-0057-01" xlink:href="note-0057-01a" xml:space="preserve">116.</note>
            mentis, æqualiter agit.</s>
            <s xml:id="echoid-s1350" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1351" xml:space="preserve">Parva quidem datur gravitatis differentia in regionibus di-
              <lb/>
            verſis, de qua agemus in cap. </s>
            <s xml:id="echoid-s1352" xml:space="preserve">17. </s>
            <s xml:id="echoid-s1353" xml:space="preserve">libri IV, nimis tamen
              <lb/>
            eſt exigua ut hìc conſideretur, præcipue cum in regionibus,
              <lb/>
            quæ inter ſe ſunt vicinæ, omnino ſit inſenſibilis.</s>
            <s xml:id="echoid-s1354" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1355" xml:space="preserve">Quando corporis deſcenſus obſtaculo impeditur, pondere
              <lb/>
              <note position="right" xlink:label="note-0057-02" xlink:href="note-0057-02a" xml:space="preserve">117.</note>
            ſuo ſemper æqualiter obſtaculum premit, Terræ centrum
              <lb/>
            verſus tendens; </s>
            <s xml:id="echoid-s1356" xml:space="preserve">poteſt ergo haberi pro potentia in obſtacu-
              <lb/>
            lum agenti, & </s>
            <s xml:id="echoid-s1357" xml:space="preserve">quæ de potentiis in capite præcedenti ſunt
              <lb/>
            demonſtrata, hìc etiam locum habent.</s>
            <s xml:id="echoid-s1358" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div191" type="section" level="1" n="67">
          <head xml:id="echoid-head113" xml:space="preserve">
            <emph style="sc">Phænomenon</emph>
          3.</head>
          <p style="it">
            <s xml:id="echoid-s1359" xml:space="preserve">Corpora quæ vi gravitatis deſcendunt, ſi omnis tollatur
              <lb/>
              <note position="right" xlink:label="note-0057-03" xlink:href="note-0057-03a" xml:space="preserve">118.</note>
            reſiſtentia, ſunt æque velocia.</s>
            <s xml:id="echoid-s1360" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1361" xml:space="preserve">Phænomenon hoc Experimento ſequenti patet.</s>
            <s xml:id="echoid-s1362" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div193" type="section" level="1" n="68">
          <head xml:id="echoid-head114" xml:space="preserve">
            <emph style="sc">Machina</emph>
          </head>
          <p style="it">
            <s xml:id="echoid-s1363" xml:space="preserve">Qua duo corpora eodem momento in vacuo dimittuntur.</s>
            <s xml:id="echoid-s1364" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1365" xml:space="preserve">Pneumaticam dicimus machinam illam, cujus ope aër
              <lb/>
              <note position="right" xlink:label="note-0057-04" xlink:href="note-0057-04a" xml:space="preserve">119.</note>
            ex vaſe extrahitur, de hac agemus in parte 3
              <emph style="super">2</emph>
            . </s>
            <s xml:id="echoid-s1366" xml:space="preserve">lib. </s>
            <s xml:id="echoid-s1367" xml:space="preserve">II.</s>
            <s xml:id="echoid-s1368" xml:space="preserve">, hìc
              <lb/>
              <note position="right" xlink:label="note-0057-05" xlink:href="note-0057-05a" xml:space="preserve">TAB. I@..
                <lb/>
              fig. 1.</note>
            repræſentatur in N.</s>
            <s xml:id="echoid-s1369" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1370" xml:space="preserve">Ut magis commode experimentum, quod nunc explican-
              <lb/>
            dum eſt, inſtituatur, a pede ſuo tollitur machina pneuma-
              <lb/>
            tica, & </s>
            <s xml:id="echoid-s1371" xml:space="preserve">depreſſo ſuſtentaculo SS ſuperimponitur.</s>
            <s xml:id="echoid-s1372" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1373" xml:space="preserve">Lamina ænea, cui vitra, ex quibus aër extrahitur, impo-
              <lb/>
            nuntur, eſt L.</s>
            <s xml:id="echoid-s1374" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1375" xml:space="preserve">Ad latera hujus duæ firmantur columnæ ligneæ AE, AE;
              <lb/>
            </s>
            <s xml:id="echoid-s1376" xml:space="preserve">harum pedes infra tabulam Machinæ pneumaticæ ſuperiorem
              <lb/>
            penetrant, & </s>
            <s xml:id="echoid-s1377" xml:space="preserve">transverſis lignis, ut t, firmantur.</s>
            <s xml:id="echoid-s1378" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1379" xml:space="preserve">Columnarum altitudo excedit pedes quinque; </s>
            <s xml:id="echoid-s1380" xml:space="preserve">junguntur
              <lb/>
            hæ tabellis ligneis quatuor BB, CC, DD, EE. </s>
            <s xml:id="echoid-s1381" xml:space="preserve">Diſtantia
              <lb/>
            inter L & </s>
            <s xml:id="echoid-s1382" xml:space="preserve">BB eſt novem aut decem pollicum; </s>
            <s xml:id="echoid-s1383" xml:space="preserve">BC, CD, DE,
              <lb/>
            ſingulæ æquales ſunt octodecim pollicibus.</s>
            <s xml:id="echoid-s1384" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1385" xml:space="preserve">Tabellæ hæ ligneæ latiores ſunt in medio, ut in ſingulis
              <lb/>
            apertura, aut foramen rotundum, detur, cujus diameter æ-
              <lb/>
            quat pollices quinque cum ſemiſſe.</s>
            <s xml:id="echoid-s1386" xml:space="preserve"/>
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