Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 1: Opera mechanica

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            <s xml:id="echoid-s4212" xml:space="preserve">
              <pb o="187" file="0263" n="289" rhead="HOROLOG. OSCILLATOR."/>
            longitudinis penduli, cujus ſingulæ oſcillationes ſemiſcru-
              <lb/>
              <note position="right" xlink:label="note-0263-01" xlink:href="note-0263-01a" xml:space="preserve">
                <emph style="sc">Secundi</emph>
                <lb/>
                <emph style="sc">HOROLO-</emph>
                <lb/>
                <emph style="sc">GII DE-</emph>
                <lb/>
                <emph style="sc">SCRIPTIO</emph>
              .</note>
            pulum ſecundum impenderent. </s>
            <s xml:id="echoid-s4213" xml:space="preserve">Ex parabolæ autem latere
              <lb/>
            recto, pendet magnitudo lateris recti paraboloidis A B;
              <lb/>
            </s>
            <s xml:id="echoid-s4214" xml:space="preserve">quippe quod illius {27/16} continet: </s>
            <s xml:id="echoid-s4215" xml:space="preserve">atque item longitudo A E,
              <lb/>
            quæ lateris recti parabolæ dimidium eſt. </s>
            <s xml:id="echoid-s4216" xml:space="preserve">Si vero ſecunda
              <lb/>
            ſcrupula unoquoque circuitu expleri deſideremus, quadru-
              <lb/>
            pla priorum accipienda ſunt, tum latera recta, tum linea
              <lb/>
            A E.</s>
            <s xml:id="echoid-s4217" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4218" xml:space="preserve">Porro, etſi filum B G F veluti unicum ac ſimplex hacte-
              <lb/>
            nus deſignavimus, ſciendum tamen longe præſtare ut parte
              <lb/>
            ſuperiori duplex ſit, ac F versùs in angulum coëat, 20 vel
              <lb/>
            30 partium. </s>
            <s xml:id="echoid-s4219" xml:space="preserve">In quem finem & </s>
            <s xml:id="echoid-s4220" xml:space="preserve">laminæ A B latitudo ad B
              <lb/>
            tanta eſſe debet, quanta iſti filorum divaricationi ſufficit,
              <lb/>
            vel & </s>
            <s xml:id="echoid-s4221" xml:space="preserve">ipſa bifida facienda. </s>
            <s xml:id="echoid-s4222" xml:space="preserve">Hoc pacto enim motus circularis
              <lb/>
            ponderis F, abſque alio ullo adminiculo, continuatur, ac filum
              <lb/>
            utrumque ſibi annexum in rectum extendit; </s>
            <s xml:id="echoid-s4223" xml:space="preserve">quod non face-
              <lb/>
            ret, ſi unico tantum filo teneretur. </s>
            <s xml:id="echoid-s4224" xml:space="preserve">Ubi tamen vim illam ab
              <lb/>
            horologii rotis, vel pondere vel alia potentia motis, ad con-
              <lb/>
            tinuationem hujus motus circularis requiri ſciendum. </s>
            <s xml:id="echoid-s4225" xml:space="preserve">Quæ
              <lb/>
            nempe vis per tympanidium K ad axem K H pervenit, ac
              <lb/>
            minimo niſu, motum ſphæræ F ſemel inditum, conſervat.</s>
            <s xml:id="echoid-s4226" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4227" xml:space="preserve">Hoc autem quo facilius poſſit, liberrimam axis K H re-
              <lb/>
            volutionem eſſe oportet. </s>
            <s xml:id="echoid-s4228" xml:space="preserve">Quod nulla ratione melius perfici
              <lb/>
            compertum, quam ſi, parte ſui ima, durato chalybe con-
              <lb/>
            ſtet, ſuppoſitamque habeat adamantis ſuperficiem planam;
              <lb/>
            </s>
            <s xml:id="echoid-s4229" xml:space="preserve">cujus minima quævis particula hic ſufficit, ſubter laminam
              <lb/>
            perforatam collocanda.</s>
            <s xml:id="echoid-s4230" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4231" xml:space="preserve">Cæterum in locum fili B G F, qua parte curvæ A B appli-
              <lb/>
            cari debet, catenulam tenuem ex auro, aliove metallo, adhi-
              <lb/>
            bere licebit, quo melius invariata ſervetur longitudo. </s>
            <s xml:id="echoid-s4232" xml:space="preserve">Atque
              <lb/>
            hoc in priore quoque horologio, ubi pendulum inter cycloi-
              <lb/>
            des ſuſpenſum eſt, experti ſumus. </s>
            <s xml:id="echoid-s4233" xml:space="preserve">Sed ibi flexus catenulæ
              <lb/>
            continuus, attritu annulorum, perexiguo licet, non parum
              <lb/>
            impedit liberam penduli agitationem.</s>
            <s xml:id="echoid-s4234" xml:space="preserve"/>
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