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

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            nim quidam neceſſario motuspro parte conſpirant, aut con-
              <lb/>
            trarie agunt; </s>
            <s xml:id="echoid-s6621" xml:space="preserve">de his nihil demonſtravimus, ex eadem tamen
              <lb/>
            theoria virium deduci poſſunt.</s>
            <s xml:id="echoid-s6622" xml:space="preserve"/>
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        <div xml:id="echoid-div937" type="section" level="1" n="236">
          <head xml:id="echoid-head332" xml:space="preserve">CAPUT XXVI.</head>
          <head xml:id="echoid-head333" style="it" xml:space="preserve">De Percuſſione obliqua.</head>
          <head xml:id="echoid-head334" xml:space="preserve">
            <emph style="sc">Definitio</emph>
          1.</head>
          <p style="it">
            <s xml:id="echoid-s6623" xml:space="preserve">ANgulus incidentiæ vocatur angulus quem directio motus
              <lb/>
              <note position="left" xlink:label="note-0240-01" xlink:href="note-0240-01a" xml:space="preserve">609.</note>
            corporis, ad aliud accedentis, efficit cum perpendicula-
              <lb/>
            ri ad ſuperficiem hujus in puncto, in quo percutitur.</s>
            <s xml:id="echoid-s6624" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div939" type="section" level="1" n="237">
          <head xml:id="echoid-head335" xml:space="preserve">
            <emph style="sc">Definitio</emph>
          . 2.</head>
          <p style="it">
            <s xml:id="echoid-s6625" xml:space="preserve">Angulus reflexionis eſt angulus, quem cum eadem per-
              <lb/>
              <note position="left" xlink:label="note-0240-02" xlink:href="note-0240-02a" xml:space="preserve">610.</note>
            pendiculari efficit directio motus corporis poſt percuſſio-
              <lb/>
            nem.</s>
            <s xml:id="echoid-s6626" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6627" xml:space="preserve">Si Corpus elaſticum P in obicem firmum elaſticum FG in-
              <lb/>
              <note position="left" xlink:label="note-0240-03" xlink:href="note-0240-03a" xml:space="preserve">611.</note>
            currat, obliquè juxta directionem P a, redibit per a p, i-
              <lb/>
              <note position="left" xlink:label="note-0240-04" xlink:href="note-0240-04a" xml:space="preserve">
                <emph style="sc">TAB. XXIII</emph>
              .
                <lb/>
              fig. 6.</note>
            ta, ut angulus incidentiæ P a B æqualis ſit angulo reflexio-
              <lb/>
            nis B a p. </s>
            <s xml:id="echoid-s6628" xml:space="preserve">Motus per P a, quam longitudine celeritatem
              <lb/>
            corporis deſignare ponimus, poteſt reſolvi in duos, quorum
              <lb/>
            unius directio parallela ſit lineæ B a, alterius huic perpen-
              <lb/>
            dicularis; </s>
            <s xml:id="echoid-s6629" xml:space="preserve">& </s>
            <s xml:id="echoid-s6630" xml:space="preserve">corpus in obicem incurret in a, quaſi celeritati-
              <lb/>
            bus C a, B a, & </s>
            <s xml:id="echoid-s6631" xml:space="preserve">juxta haſce directiones, ad hunc accederet *.
              <lb/>
            </s>
            <s xml:id="echoid-s6632" xml:space="preserve">
              <note symbol="*" position="left" xlink:label="note-0240-05" xlink:href="note-0240-05a" xml:space="preserve">604.</note>
            Motus per C a ictu non mutatur & </s>
            <s xml:id="echoid-s6633" xml:space="preserve">celeritate a E corpus
              <lb/>
            motum continuat, poſitis C a, a E æqualibus; </s>
            <s xml:id="echoid-s6634" xml:space="preserve">motu per
              <lb/>
            B a directè in obſtaculum incurrit, & </s>
            <s xml:id="echoid-s6635" xml:space="preserve">per eandem lineam,
              <lb/>
            ea qua acceſſit celeritate redit , id eſt per a B; </s>
            <s xml:id="echoid-s6636" xml:space="preserve">hiſce
              <note symbol="*" position="left" xlink:label="note-0240-06" xlink:href="note-0240-06a" xml:space="preserve">559.</note>
            tem duobus motibus agitatum corpus redit per a p, diago-
              <lb/>
            nalem rectanguli lineis a E, a B, formati ; </s>
            <s xml:id="echoid-s6637" xml:space="preserve">Triangula
              <note symbol="*" position="left" xlink:label="note-0240-07" xlink:href="note-0240-07a" xml:space="preserve">246.</note>
            rò BP a, B a p eſſe æqualia liquet, unde conſtat propoſi-
              <lb/>
            tum. </s>
            <s xml:id="echoid-s6638" xml:space="preserve">Simili methodo detegimus motus corporum oblique
              <lb/>
            in ſe mutuo impingentium.</s>
            <s xml:id="echoid-s6639" xml:space="preserve"/>
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          <p>
            <s xml:id="echoid-s6640" xml:space="preserve">Corpus Q quieſcit, corpus P, directione & </s>
            <s xml:id="echoid-s6641" xml:space="preserve">celeritate
              <lb/>
              <note position="left" xlink:label="note-0240-08" xlink:href="note-0240-08a" xml:space="preserve">
                <emph style="sc">TAB XXII</emph>
              .
                <lb/>
              fig. 11. & 12.</note>
            PA, in illud impingitur. </s>
            <s xml:id="echoid-s6642" xml:space="preserve">Per centra amborum corporum,
              <lb/>
            cum P in A pervenerit, ducatur linea DB, & </s>
            <s xml:id="echoid-s6643" xml:space="preserve">ad </s>
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