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-s14208" xml:space="preserve">
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            tionibus, neceſſe eſt, ut objecta illuminentur radiis, tranſeun-
              <lb/>
            do per lentem convexam, collectis.</s>
            <s xml:id="echoid-s14209" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s14210" xml:space="preserve">Magnam cum Microſcopio compoſito affinitatem habet
              <lb/>
            Teleſcopium Aſtronomicum.</s>
            <s xml:id="echoid-s14211" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div2131" type="section" level="1" n="520">
          <head xml:id="echoid-head689" xml:space="preserve">
            <emph style="sc">Definitio</emph>
          3.</head>
          <p style="it">
            <s xml:id="echoid-s14212" xml:space="preserve">Teleſcopia vocantur, inſtrumenta ad objecta longinqua vi-
              <lb/>
              <note position="left" xlink:label="note-0556-01" xlink:href="note-0556-01a" xml:space="preserve">768.</note>
            denda adaptata.</s>
            <s xml:id="echoid-s14213" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s14214" xml:space="preserve">De quo nunc agimus, vocatur Aſtronomicum, quia rebus
              <lb/>
              <note position="left" xlink:label="note-0556-02" xlink:href="note-0556-02a" xml:space="preserve">769.</note>
            terreſtribus videndis minimè eſt aptum, objecta enim inver-
              <lb/>
            ſa repræſentat: </s>
            <s xml:id="echoid-s14215" xml:space="preserve">de ſitu autèm apparentiæ minimè ſolliciti
              <lb/>
            ſunt Aſtronomi.</s>
            <s xml:id="echoid-s14216" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s14217" xml:space="preserve">Teleſcopium hoc conſtat ex duabus lentibus convexis, unâ
              <lb/>
            objectivâ, quæ verſus objecta diſponitur, alterâ oculari, quæ
              <lb/>
            ad partem oculi datur. </s>
            <s xml:id="echoid-s14218" xml:space="preserve">Ope primæ, objecta longinqua ad
              <lb/>
            certam diſtantiam poſt lentem repræſentantur , ut in
              <note symbol="*" position="left" xlink:label="note-0556-03" xlink:href="note-0556-03a" xml:space="preserve">711.</note>
            croſcopio compoſito objecta propinqua. </s>
            <s xml:id="echoid-s14219" xml:space="preserve">Per lentem ocula-
              <lb/>
            rem ſi obſervetur hæc repræſentatio, amplificata & </s>
            <s xml:id="echoid-s14220" xml:space="preserve">inverſa
              <lb/>
            apparet, ut de Microſcopio dictum. </s>
            <s xml:id="echoid-s14221" xml:space="preserve">Campum etiam in hoc
              <lb/>
              <note position="left" xlink:label="note-0556-04" xlink:href="note-0556-04a" xml:space="preserve">770.</note>
            caſu, ut in Microſcopio, à magnitudine lentis ocularis pen-
              <lb/>
            dere, clarè liquet; </s>
            <s xml:id="echoid-s14222" xml:space="preserve">ut & </s>
            <s xml:id="echoid-s14223" xml:space="preserve">ſitum oculi eodem modo pro Teleſco-
              <lb/>
              <note position="left" xlink:label="note-0556-05" xlink:href="note-0556-05a" xml:space="preserve">771.</note>
            pio, quàm pro Microſcopio, determinari : </s>
            <s xml:id="echoid-s14224" xml:space="preserve">differt enim
              <note symbol="*" position="left" xlink:label="note-0556-06" xlink:href="note-0556-06a" xml:space="preserve">766.</note>
            leſcopium Aſtronomicum à Microſcopio compoſito in eo ſo-
              <lb/>
            lo, quod in hoc lentes ſint magis convexæ, quæ objectis lon-
              <lb/>
            ginquis videndis minimè ſunt aptæ, præcipuè quod ſpectat
              <lb/>
            lentes objectivas. </s>
            <s xml:id="echoid-s14225" xml:space="preserve">In Microſcopio lens objectiva ocularem
              <lb/>
            convexitate ſuperat; </s>
            <s xml:id="echoid-s14226" xml:space="preserve">in Teleſcopio contrarium obtinet.</s>
            <s xml:id="echoid-s14227" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s14228" xml:space="preserve">Teleſcopia, quantumvis longa, ſideribus obſervandis apta
              <lb/>
            ſunt: </s>
            <s xml:id="echoid-s14229" xml:space="preserve">quæ viginti pedes excedunt, ad objecta, in terræ ſuper-
              <lb/>
            ſicie, videnda nullius uſus ſunt; </s>
            <s xml:id="echoid-s14230" xml:space="preserve">propter aëris continuam agita-
              <lb/>
            tionem, in tantâ objectorum amplificatione nimium ſenſibilem.</s>
            <s xml:id="echoid-s14231" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s14232" xml:space="preserve">Brevius autem Teleſcopium Aſtronomicum, rebus terreſtri-
              <lb/>
              <note position="left" xlink:label="note-0556-07" xlink:href="note-0556-07a" xml:space="preserve">772.</note>
            bus videndis, adaptatur, additis duabus lentibus convexis,
              <lb/>
            quæ etiam oculares dicuntur; </s>
            <s xml:id="echoid-s14233" xml:space="preserve">tres autèm oculares ſimiles
              <lb/>
            ſunt, & </s>
            <s xml:id="echoid-s14234" xml:space="preserve">minus convexæ quàm in Teleſcopio Aſtronomico,
              <lb/>
            ſervatâ eâdem lente objectivâ.</s>
            <s xml:id="echoid-s14235" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s14236" xml:space="preserve">Detur lens objectiva VV, quæ objectum longinquum in-
              <lb/>
              <note position="left" xlink:label="note-0556-08" xlink:href="note-0556-08a" xml:space="preserve">773.</note>
            verſum repræſentat in e a; </s>
            <s xml:id="echoid-s14237" xml:space="preserve">Dentur ulterius lentes oculares
              <lb/>
              <note position="left" xlink:label="note-0556-09" xlink:href="note-0556-09a" xml:space="preserve">TAB. XI.
                <lb/>
              fig. 3.</note>
            </s>
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