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

Table of contents

< >
[621.] Definitio 6.
[622.] Definitio 7.
[623.] CAPUT IV. De Phænomenis Planetarum inferiorum, ex horum, & Telluris, motibus in orbitis ſuis.
[624.] Definitio 1.
[625.] CAPUT V. De Pbænomenis Planetarum ſuperiorum, ex horum & Telluris motibus in orbitis ſuis.
[626.] CAPUT VI. De Phænomenis Satellitum, ex motu horum in orbi-tis. Vbi de Eclipſibus Solis & Lunæ.
[627.] Definitio i.
[628.] Definitio 2.
[629.] Definitio 3.
[630.] Definitio 4.
[631.] Definitio 5.
[632.] Definitio 6.
[633.] Definitio 7.
[634.] Definitio 8.
[635.] Definitio 9.
[636.] CAPUT VII. De Pbænomenis ex motu Solis, Planetarum, & Lunæ, circa axes.
[637.] Definitio 1.
[638.] Definitio 2.
[639.] Definitio 3.
[640.] Definitio 4.
[641.] Definitio 5.
[642.] Definitio 6.
[643.] Definitio 7.
[644.] Definitio 8.
[645.] CAPUT VIII. De Phænomenis Telluris ſuperficiem, & peculiares hujus partes, ſpectantibus.
[646.] Definitio 1.
[647.] Definitio 2.
[648.] Definitio 3.
[649.] Definitio 4.
[650.] Definitio 5.
< >
page |< < ((81)) of 824 > >|
    <echo version="1.0RC">
      <text xml:lang="la" type="free">
        <div xml:id="echoid-div2250" type="section" level="1" n="552">
          <p>
            <s xml:id="echoid-s15026" xml:space="preserve">
              <pb o="(81)" file="0591" n="652" rhead="MATHEMATICA LIB. III. CAP. XVIII."/>
            illuminata rotunda, eo major, quo planum magis à foramine
              <lb/>
            diſtat, quod oritur ex radiis à lateribus Solis provenientibus,
              <lb/>
            cum illis, qui à centro ad foramen perveniunt angulum
              <lb/>
            formantibus, & </s>
            <s xml:id="echoid-s15027" xml:space="preserve">in foramine hos interſecantibus, ita ut in
              <lb/>
            plano quaſi imago Solis detur.</s>
            <s xml:id="echoid-s15028" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s15029" xml:space="preserve">Si radii per priſma BB non tranſirent, & </s>
            <s xml:id="echoid-s15030" xml:space="preserve">ad diſtantiam
              <lb/>
            tabulæ T in planum caderent, Solis imago haberet diametrum
              <lb/>
            æqualem latitudini imaginis RV; </s>
            <s xml:id="echoid-s15031" xml:space="preserve">quæ latitudo refractione
              <lb/>
            non mutatur; </s>
            <s xml:id="echoid-s15032" xml:space="preserve">quia radii, perpendiculariter ad axem, priſma
              <lb/>
            intrant, & </s>
            <s xml:id="echoid-s15033" xml:space="preserve">ad hoc, reſpectu latitudinis imaginis, non in-
              <lb/>
            clinantur. </s>
            <s xml:id="echoid-s15034" xml:space="preserve">Cum autem alio reſpectu oblonga ſit Solis imago,
              <lb/>
              <note position="right" xlink:label="note-0591-01" xlink:href="note-0591-01a" xml:space="preserve">853.</note>
            clarè inde ſequitur, non omnes radios æqualem paſſos re-
              <lb/>
            fractionem; </s>
            <s xml:id="echoid-s15035" xml:space="preserve">radiis homogeneis rotundam, licèt refractis,
              <lb/>
            dantibus Solis imaginem. </s>
            <s xml:id="echoid-s15036" xml:space="preserve">Minimè refrangibiles radii pertin-
              <lb/>
            gunt ad R, maximè refrangibiles ad V; </s>
            <s xml:id="echoid-s15037" xml:space="preserve">& </s>
            <s xml:id="echoid-s15038" xml:space="preserve">ſemicirculis in
              <lb/>
            R & </s>
            <s xml:id="echoid-s15039" xml:space="preserve">V terminatur tota imago RV; </s>
            <s xml:id="echoid-s15040" xml:space="preserve">quia ex circularibus
              <lb/>
            imaginibus tota conſtat: </s>
            <s xml:id="echoid-s15041" xml:space="preserve">inter R & </s>
            <s xml:id="echoid-s15042" xml:space="preserve">V autem dantur imagi-
              <lb/>
            nes circulares innumeræ, ex radiis refrangibilitatum inter-
              <lb/>
            mediarum omnium poſſibilium; </s>
            <s xml:id="echoid-s15043" xml:space="preserve">aliter ad latera non lineis
              <lb/>
            rectis imago RV terminaretur.</s>
            <s xml:id="echoid-s15044" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s15045" xml:space="preserve">In plurimis experimentis, per ſciſſuram aut foramen lu-
              <lb/>
            men intromitti in locum obſcurum, vidimus, quod ad arbi-
              <lb/>
            trium artificis reliquimus; </s>
            <s xml:id="echoid-s15046" xml:space="preserve">nos autem hac methodo uſi ſumus.</s>
            <s xml:id="echoid-s15047" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s15048" xml:space="preserve">In plano ligneo, quo feneſtræ apertura obturatur, datur
              <lb/>
              <note position="right" xlink:label="note-0591-02" xlink:href="note-0591-02a" xml:space="preserve">854.</note>
            foramen quadratum, cujus latus eſt quatuor pollicum; </s>
            <s xml:id="echoid-s15049" xml:space="preserve">cir-
              <lb/>
              <note position="right" xlink:label="note-0591-03" xlink:href="note-0591-03a" xml:space="preserve">TAB. XV.
                <lb/>
              fig. 3.</note>
            cumdatur hoc tribus regulis ligneis AB, BC, CD, quæ
              <lb/>
            retinent tabellam ligneam quadratam R, longitudinis & </s>
            <s xml:id="echoid-s15050" xml:space="preserve">la-
              <lb/>
            titudinis ſex pollicum. </s>
            <s xml:id="echoid-s15051" xml:space="preserve">Extrahi poteſt hæc, & </s>
            <s xml:id="echoid-s15052" xml:space="preserve">variæ dantur
              <lb/>
            variis experimentis inſervientes. </s>
            <s xml:id="echoid-s15053" xml:space="preserve">Quæ in experimento ſe-
              <lb/>
            quenti adhibetur, à parte poſteriori in medio excavatur, ut
              <lb/>
            contineat lentem convexam, objectivam Teleſcopii ſedecim
              <lb/>
            aut viginti pedum; </s>
            <s xml:id="echoid-s15054" xml:space="preserve">& </s>
            <s xml:id="echoid-s15055" xml:space="preserve">in medio datur foramen rotundum f,
              <lb/>
            cujus diameter ſemi pollicem ſuperat, per quod, tranſeun-
              <lb/>
            do per vitrum, radii ſolares cubiculum intrant. </s>
            <s xml:id="echoid-s15056" xml:space="preserve">In ante-
              <lb/>
            riori parte quoque excavatur tabella Q, non tamen in medio;
              <lb/>
            </s>
            <s xml:id="echoid-s15057" xml:space="preserve">continet cavitas hæc orbem æneum rotundum L, verſus pe-
              <lb/>
            ripheriam perforatum in f, quod foramen æquale eſt </s>
          </p>
        </div>
      </text>
    </echo>