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

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          <p>
            <s xml:id="echoid-s17840" xml:space="preserve">
              <pb o="160" file="0688" n="758" rhead="PHYSICES ELEMENTA"/>
            etiam continuò verſus illa corpora trahitur; </s>
            <s xml:id="echoid-s17841" xml:space="preserve">ita ut violentiſ-
              <lb/>
            ſimo motu neceſſario agitari debeat; </s>
            <s xml:id="echoid-s17842" xml:space="preserve">unde patet motum diur-
              <lb/>
            num non ad ipſa corpora coeleſtia referri debere, ſed ad
              <lb/>
            Tellurem circa axem rotantem.</s>
            <s xml:id="echoid-s17843" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s17844" xml:space="preserve">Objiciunt, qui Tellurem quieſcere contendunt, corpora
              <lb/>
              <note position="left" xlink:label="note-0688-01" xlink:href="note-0688-01a" xml:space="preserve">1251.</note>
            in Telluris ſuperficie, ex vi centrifugâ, juxta tangentem ad
              <lb/>
            circulùm, Æquatori parallelum, debere à Tellure recede-
              <lb/>
            re . </s>
            <s xml:id="echoid-s17845" xml:space="preserve">Reſpondemus, corpora eodem motu cum
              <note symbol="*" position="left" xlink:label="note-0688-02" xlink:href="note-0688-02a" xml:space="preserve">217.</note>
            Telluris, in locis in quibus antur, transferri, & </s>
            <s xml:id="echoid-s17846" xml:space="preserve">ideò reſpe-
              <lb/>
            ctu punctorum ſuperficiei conari recedere per lineas ad axem
              <lb/>
            perpendiculares ; </s>
            <s xml:id="echoid-s17847" xml:space="preserve">etiam corpora gravitate ad centrum
              <note symbol="*" position="left" xlink:label="note-0688-03" xlink:href="note-0688-03a" xml:space="preserve">223.</note>
            luris tendere ; </s>
            <s xml:id="echoid-s17848" xml:space="preserve">& </s>
            <s xml:id="echoid-s17849" xml:space="preserve">ideò, motu ex hiſce ambobus
              <note symbol="*" position="left" xlink:label="note-0688-04" xlink:href="note-0688-04a" xml:space="preserve">1226.</note>
            to, corpus continuò, aut moveri aut moveri conari ; </s>
            <s xml:id="echoid-s17850" xml:space="preserve">
              <note symbol="*" position="left" xlink:label="note-0688-05" xlink:href="note-0688-05a" xml:space="preserve">190. 198.</note>
            quia primus motus reſpectu ſecundi eſt admodum exiguus,
              <lb/>
            parum tantùm à directione verſus centrum detorquetur gra-
              <lb/>
            ve, & </s>
            <s xml:id="echoid-s17851" xml:space="preserve">paululum gravitas minuitur, eo magis, quo locus ma-
              <lb/>
            gis à polo diſtat; </s>
            <s xml:id="echoid-s17852" xml:space="preserve">Quod experientiæ congruit; </s>
            <s xml:id="echoid-s17853" xml:space="preserve">in ſequenti-
              <lb/>
            bus etiam videbimus, ubi de Telluris figurà agemus, directio-
              <lb/>
            nem memoratam gravium, ubique dirigi perpendiculariter ad
              <lb/>
            Telluris ſuperſiciem. </s>
            <s xml:id="echoid-s17854" xml:space="preserve">Corpus, quod in altum projicitur,
              <lb/>
            non modo motu quo projicitur gaudet, ſed etiam fertur mo-
              <lb/>
            tu impreſſo illi, qui hoc projicit, aut machinæ, ex qua pro-
              <lb/>
            pellitur, id eſt, motu communi cum ſuperficie Telluris fertur;
              <lb/>
            </s>
            <s xml:id="echoid-s17855" xml:space="preserve">ideòque in eâdem lineêa, cum ſuperficie Telluris tranſlatâ
              <lb/>
            movetur, in qua tranſlatum foret ſi Tellus quieſceret.</s>
            <s xml:id="echoid-s17856" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div2747" type="section" level="1" n="674">
          <head xml:id="echoid-head873" xml:space="preserve">CAPUT XIV.</head>
          <head xml:id="echoid-head874" xml:space="preserve">De Denſitate Planetarum.</head>
          <p>
            <s xml:id="echoid-s17857" xml:space="preserve">SUpereſt, antequam ad Syſtematis explicationem Phyſicam
              <lb/>
            tranſeamus, ut quantitates materiæ in quibuſdam corpo-
              <lb/>
            ribus, & </s>
            <s xml:id="echoid-s17858" xml:space="preserve">horum denſitates, determinemus; </s>
            <s xml:id="echoid-s17859" xml:space="preserve">quibus notis ef-
              <lb/>
            fectus legum, quibus hæc corpora reguntur, facilius pate-
              <lb/>
            bunt.</s>
            <s xml:id="echoid-s17860" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s17861" xml:space="preserve">Quantitates materiæ, in variis corporibus, ſunt inter ſe, ut
              <lb/>
            gravitates ad eandem diſtantiam ab hiſce corporius ; </s>
            <s xml:id="echoid-s17862" xml:space="preserve">
              <note symbol="*" position="left" xlink:label="note-0688-06" xlink:href="note-0688-06a" xml:space="preserve">1207.</note>
            gravitates ſunt inter ſe inverſè, ut quadrata temporum </s>
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