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-s13362" xml:space="preserve">
              <pb o="31" file="0521" n="572" rhead="MATHEMATICA LIB. III. CAP. VII."/>
            reflectitur; </s>
            <s xml:id="echoid-s13363" xml:space="preserve">tranſmittitur per lentem vitream convexam in
              <lb/>
            tabella T, & </s>
            <s xml:id="echoid-s13364" xml:space="preserve">radii in R colliguntur, & </s>
            <s xml:id="echoid-s13365" xml:space="preserve">poſt R moventur quaſi
              <lb/>
            ab hoc puncto procederent; </s>
            <s xml:id="echoid-s13366" xml:space="preserve">quod ergo eſt punctum radians.</s>
            <s xml:id="echoid-s13367" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s13368" xml:space="preserve">Lentes vitreæ convexæ ſunt admodum vulgares; </s>
            <s xml:id="echoid-s13369" xml:space="preserve">de ha-
              <lb/>
            rum proprietatibus in ſequentibus agam , hasque
              <note symbol="*" position="right" xlink:label="note-0521-01" xlink:href="note-0521-01a" xml:space="preserve">691. 697.</note>
            hujus loci non eſt; </s>
            <s xml:id="echoid-s13370" xml:space="preserve">in hoc experimento indigemus puncto ra-
              <lb/>
            diante, & </s>
            <s xml:id="echoid-s13371" xml:space="preserve">ſatis eſt hujus formationem memoraſſe.</s>
            <s xml:id="echoid-s13372" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s13373" xml:space="preserve">Detur Pixis P cujus latus abcd eſt vitreum, aquâ im-
              <lb/>
            pleatur; </s>
            <s xml:id="echoid-s13374" xml:space="preserve">radii, divergentes a puncto R, aquam ingreſſi mi-
              <lb/>
            nus divergentes erunt.</s>
            <s xml:id="echoid-s13375" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s13376" xml:space="preserve">Quando radii convergentes, ut HD, I p, L q, habentes
              <lb/>
              <note position="right" xlink:label="note-0521-02" xlink:href="note-0521-02a" xml:space="preserve">658.</note>
            focum imaginarium f, è medio rariori Z in denſius X pene-
              <lb/>
              <note position="right" xlink:label="note-0521-03" xlink:href="note-0521-03a" xml:space="preserve">TAB. V.
                <lb/>
              fig. 1.</note>
            trant, minus convergentes fiunt , & </s>
            <s xml:id="echoid-s13377" xml:space="preserve">in focum F,
              <note symbol="*" position="right" xlink:label="note-0521-04" xlink:href="note-0521-04a" xml:space="preserve">624.</note>
            diſtantem a ſuperficie ES , concurrunt ut patet hic
              <note symbol="*" position="right" xlink:label="note-0521-05" xlink:href="note-0521-05a" xml:space="preserve">652.</note>
            cando demonſtrationem datam in n. </s>
            <s xml:id="echoid-s13378" xml:space="preserve">654.</s>
            <s xml:id="echoid-s13379" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s13380" xml:space="preserve">Radii ex puncto F procedentes, & </s>
            <s xml:id="echoid-s13381" xml:space="preserve">ex medio denſiori in
              <lb/>
              <note position="right" xlink:label="note-0521-06" xlink:href="note-0521-06a" xml:space="preserve">659.</note>
            rarius penetrantes, magis divergentes fiunt, & </s>
            <s xml:id="echoid-s13382" xml:space="preserve">moventur
              <lb/>
            quaſi ex f procederent; </s>
            <s xml:id="echoid-s13383" xml:space="preserve">quæ propoſitio eſt inverſa præce-
              <lb/>
            dentis, & </s>
            <s xml:id="echoid-s13384" xml:space="preserve">cum hac eodem Experimento confirmatur .</s>
            <s xml:id="echoid-s13385" xml:space="preserve"/>
          </p>
          <note symbol="*" position="right" xml:space="preserve">626.</note>
        </div>
        <div xml:id="echoid-div1982" type="section" level="1" n="490">
          <head xml:id="echoid-head655" xml:space="preserve">
            <emph style="sc">Experimentum</emph>
          2.</head>
          <p>
            <s xml:id="echoid-s13386" xml:space="preserve">Eâdem, cum præcedenti Experimento, pixide P inſtituitur;
              <lb/>
            </s>
            <s xml:id="echoid-s13387" xml:space="preserve">
              <note position="right" xlink:label="note-0521-08" xlink:href="note-0521-08a" xml:space="preserve">TAB. V.
                <lb/>
              fig. 3.</note>
            in hoc, lumen ſolare in cubiculum obſcurum intromittitur per
              <lb/>
            duo foramina in orbe mobili O, qui in feneſtra datur; </s>
            <s xml:id="echoid-s13388" xml:space="preserve">à ſpeculo
              <lb/>
            horizontaliter reflectantur radiiambo, & </s>
            <s xml:id="echoid-s13389" xml:space="preserve">per lentes convexas,
              <lb/>
            ſimiles tranſmittantur; </s>
            <s xml:id="echoid-s13390" xml:space="preserve">quo radii, ex quibus radii primi con-
              <lb/>
            ſtant, convergentes fiunt, habentes focos ad eandem diſtan-
              <lb/>
            tiam; </s>
            <s xml:id="echoid-s13391" xml:space="preserve">ſi autem radii convergentes in aquam, pixide conten-
              <lb/>
            tam, per latus vitreum abcd penetrent, ad majorem di-
              <lb/>
            ſtantiam colligentur; </s>
            <s xml:id="echoid-s13392" xml:space="preserve">quod clarè patet, comparando inter ſe
              <lb/>
            ſitus punctorum F in aëre & </s>
            <s xml:id="echoid-s13393" xml:space="preserve">f in aqua.</s>
            <s xml:id="echoid-s13394" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div1984" type="section" level="1" n="491">
          <head xml:id="echoid-head656" xml:space="preserve">CAPUT VIII.</head>
          <head xml:id="echoid-head657" style="it" xml:space="preserve">De refractione luminis, poſitis mediis ſuperficie
            <lb/>
          ſphæricâ ſeparatis.</head>
          <p>
            <s xml:id="echoid-s13395" xml:space="preserve">SInt Media denſitate differentia X & </s>
            <s xml:id="echoid-s13396" xml:space="preserve">Z, hoc rarius illud
              <lb/>
              <note position="right" xlink:label="note-0521-09" xlink:href="note-0521-09a" xml:space="preserve">TAB. VI.
                <lb/>
              fig. 1.</note>
            denſius; </s>
            <s xml:id="echoid-s13397" xml:space="preserve">ſeparentur ſuperficie ſphæricâ ES, cujus cen-
              <lb/>
            trum eſt C, & </s>
            <s xml:id="echoid-s13398" xml:space="preserve">cujus convexitas eſt ad partem medii rarioris.</s>
            <s xml:id="echoid-s13399" xml:space="preserve"/>
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