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

Table of contents

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[531.] CAPUT XV. De Speculis ſphæricis.
Page: 626 (64)
[532.] Experimentum 1.
Page: 628 (66)
[533.] Experimentum 2.
Page: 628 (66)
[534.] Experimentum 3.
Page: 633 ((68))
[535.] Accedente autem ad ſpeculum corpore lucido, recedit ap-parentia , quæ in eo caſu major eſt.
Page: 635 ((70))
[536.] Experimentum 4.
Page: 635 ((70))
[537.] Experimentum 5.
Page: 635 ((70))
[538.] CAPUT XVI. De Lucerna Magica.
Page: 637 ((72))
[539.] LIBRI III. Pars III. De Opaco & Coloribus. CAPUT XVII. De Corporum Opacitate Definitio.
Page: 643 ((75))
[540.] Experimentum. 1.
Page: 644 ((76))
[541.] Experimentum 2.
Page: 644 ((76))
[542.] Experimentum 3.
Page: 648 ((77))
[543.] Experimentum 4.
Page: 648 ((77))
[544.] Experimentum 5.
Page: 648 ((77))
[545.] Experimentum 6.
Page: 648 ((77))
[546.] Experimentum 7.
Page: 648 ((77))
[547.] Experimentum 8.
Page: 648 ((77))
[548.] CAPUT XVIII. De diverſâ radiorum ſolarium refrangibilitate.
Page: 649 ((78))
[549.] Definitio 1.
Page: 649 ((78))
[550.] Definitio 2.
Page: 649 ((78))
[551.] Definitio 3.
Page: 649 ((78))
[552.] Experimentum 1.
Page: 651 ((80))
[553.] Experimentum 2.
Page: 653 ((82))
[554.] Experimentum 3.
Page: 653 ((82))
[555.] Experimentum 4.
Page: 653 ((82))
[556.] Experimentum 5.
Page: 654 ((83))
[557.] CAPUT XIX. De Radiorum Coloribus & horum immutabilitate.
Page: 655 ((84))
[558.] Definitio 1.
Page: 655 ((84))
[559.] Definitio 2.
Page: 655 ((84))
[560.] Experimentum 1.
Page: 659 ((85))
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            <s xml:id="echoid-s12694" xml:space="preserve">
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            tur aqua ebulliens, æquali quantitate in utroque; </s>
            <s xml:id="echoid-s12695" xml:space="preserve">impona-
              <lb/>
            tur unum laminæ Machinæ Pneumaticæ & </s>
            <s xml:id="echoid-s12696" xml:space="preserve">ſuperimpoſito
              <lb/>
            vaſe aër ex hoc extrahatur; </s>
            <s xml:id="echoid-s12697" xml:space="preserve">dum aër extrahitur ebullit aqua
              <lb/>
            violenter ex actione ignis exeuntis; </s>
            <s xml:id="echoid-s12698" xml:space="preserve">ſtatim enim hæc tepida
              <lb/>
            fit, dum aqua, quæ in vaſe alio aëri remanſit expoſita, vix
              <lb/>
            ex calore quid amiſit.</s>
            <s xml:id="echoid-s12699" xml:space="preserve"/>
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          <p>
            <s xml:id="echoid-s12700" xml:space="preserve">Quid ſimile obſervamus reſpectu ligni lucidi; </s>
            <s xml:id="echoid-s12701" xml:space="preserve">lignum enim
              <lb/>
              <note position="left" xlink:label="note-0492-01" xlink:href="note-0492-01a" xml:space="preserve">578.</note>
            datur, quod in terra putrefactum, ſi terrâ extrahatur, lucet;
              <lb/>
            </s>
            <s xml:id="echoid-s12702" xml:space="preserve">terra quæ lignum circundat retinet ignem, ſublatâ hac i-
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            gnis exit & </s>
            <s xml:id="echoid-s12703" xml:space="preserve">per aliquot dies lucidum manet. </s>
            <s xml:id="echoid-s12704" xml:space="preserve">In vacuo cito
              <lb/>
            perit lumen & </s>
            <s xml:id="echoid-s12705" xml:space="preserve">admiſſo aëre non reſtituitur.</s>
            <s xml:id="echoid-s12706" xml:space="preserve"/>
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            <s xml:id="echoid-s12707" xml:space="preserve">Quomodo autem ignis in corpore retineatur a corporibus
              <lb/>
            circundantibus & </s>
            <s xml:id="echoid-s12708" xml:space="preserve">cuinam actioni effectus hic tribuendus ſit,
              <lb/>
            non facile determinari poterit; </s>
            <s xml:id="echoid-s12709" xml:space="preserve">minimè probabile eſt preſ-
              <lb/>
            fionem hìc eſſe conſiderandam, cùm ignis omnia corpora
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            ſubtilitate ſua facile penetret.</s>
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          <head xml:id="echoid-head613" xml:space="preserve">CAPUT III.</head>
          <head xml:id="echoid-head614" style="it" xml:space="preserve">De motu Ignis, ubi de Calore & Lumine.</head>
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            <s xml:id="echoid-s12711" xml:space="preserve">IGnem celerrime moveri diximus , motus hicce pro
              <note symbol="*" position="left" xlink:label="note-0492-02" xlink:href="note-0492-02a" xml:space="preserve">545.</note>
            circumſtantiis diverſos edit effectus. </s>
            <s xml:id="echoid-s12712" xml:space="preserve">Calor & </s>
            <s xml:id="echoid-s12713" xml:space="preserve">lumen di-
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            verſitati motus ignis adſcribenda ſunt.</s>
            <s xml:id="echoid-s12714" xml:space="preserve"/>
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            <s xml:id="echoid-s12715" xml:space="preserve">Calor in corpore calido eſt agitatio partium corporis & </s>
            <s xml:id="echoid-s12716" xml:space="preserve">
              <lb/>
              <note position="left" xlink:label="note-0492-03" xlink:href="note-0492-03a" xml:space="preserve">579.</note>
            ignis in hoc contenti, qua agitatione motus in corpore no-
              <lb/>
            ſtro datur, qui ideam caloris in mente noſtra excitat;</s>
            <s xml:id="echoid-s12717" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s12718" xml:space="preserve">Calor noſtri reſpectu nibil eſt præter illam ideam, & </s>
            <s xml:id="echoid-s12719" xml:space="preserve">in
              <lb/>
              <note position="left" xlink:label="note-0492-04" xlink:href="note-0492-04a" xml:space="preserve">580.</note>
            corpore calido nil datur præter motum.</s>
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            <s xml:id="echoid-s12721" xml:space="preserve">Hic in memoriam revocare debemus, quæ no. </s>
            <s xml:id="echoid-s12722" xml:space="preserve">502. </s>
            <s xml:id="echoid-s12723" xml:space="preserve">de
              <lb/>
            ſenſationibus in genere dicta ſunt, quæ etiam ad lumen re-
              <lb/>
            ſerri debent.</s>
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            <s xml:id="echoid-s12725" xml:space="preserve">Quando ignis per lineas rectas oculos noſtros intrat, ex
              <lb/>
              <note position="left" xlink:label="note-0492-05" xlink:href="note-0492-05a" xml:space="preserve">581.</note>
            motu quem fibris in fundo oculi communicat, ideam luminis
              <lb/>
            excitat; </s>
            <s xml:id="echoid-s12726" xml:space="preserve">de quo fibrarum motu in ſequentibus peculiarius
              <lb/>
            erit agendum . </s>
            <s xml:id="echoid-s12727" xml:space="preserve">Motum per lineas rectas in lumine dari
              <note position="left" xlink:label="note-0492-06" xlink:href="note-0492-06a" xml:space="preserve">582.</note>
            obſtaculo quo lumen intercipitur facile probatur. </s>
            <s xml:id="echoid-s12728" xml:space="preserve">Contra
              <lb/>
              <note symbol="*" position="left" xlink:label="note-0492-07" xlink:href="note-0492-07a" xml:space="preserve">716.</note>
            autem talem motum in calore non requiri, motumque </s>
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