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

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            <s xml:id="echoid-s4339" xml:space="preserve">
              <pb o="197" file="0275" n="302" rhead="DE USU HOROLOG."/>
            dius ex adverſo 2 filorum conſpicitur. </s>
            <s xml:id="echoid-s4340" xml:space="preserve">Dein poſt aliquot dies
              <lb/>
            obſervatio rurſus eodem modo eſt inſtituenda, ubi ſol ex
              <lb/>
            adverſo filorum cernitur, & </s>
            <s xml:id="echoid-s4341" xml:space="preserve">ſimiliter notanda hora minu-
              <lb/>
            ta & </s>
            <s xml:id="echoid-s4342" xml:space="preserve">ſecunda horologiorum, quibus adde æquationem ejus
              <lb/>
            diei excerptam ex Tabulâ, & </s>
            <s xml:id="echoid-s4343" xml:space="preserve">ſi aggregatum exacte compo-
              <lb/>
            nat 12 horas Horologium ad rectam menſuram accommoda-
              <lb/>
            tum eſt. </s>
            <s xml:id="echoid-s4344" xml:space="preserve">Si vero differat dividenda ſunt minuta & </s>
            <s xml:id="echoid-s4345" xml:space="preserve">ſecunda
              <lb/>
            iſtius differentiæ, per numerum dierum inter utramque ob-
              <lb/>
            ſervationem, ad obtinendam quotidianam differentiam.</s>
            <s xml:id="echoid-s4346" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4347" xml:space="preserve">Supponamus hanc ſecundam obſervationem fieri 30. </s>
            <s xml:id="echoid-s4348" xml:space="preserve">Mar-
              <lb/>
            tii ſcil. </s>
            <s xml:id="echoid-s4349" xml:space="preserve">octo diebus poſt primam & </s>
            <s xml:id="echoid-s4350" xml:space="preserve">comperiatur medietate
              <lb/>
            ſolis viſa in meridiano ex adverſo 2. </s>
            <s xml:id="echoid-s4351" xml:space="preserve">filorum,
              <lb/>
              <note position="right" xlink:label="note-0275-01" xlink:href="note-0275-01a" xml:space="preserve">
                <lb/>
              h. # m. # ſ.
                <lb/>
              11. # 51. # 7.
                <lb/>
              0. # 10. # 40.
                <lb/>
              12. # 1. # 47.
                <lb/>
              </note>
            horologium indicare
              <lb/>
            Æquatio 30. </s>
            <s xml:id="echoid-s4352" xml:space="preserve">Martii in tabula eſt
              <lb/>
            præbet ſummam</s>
          </p>
          <p>
            <s xml:id="echoid-s4353" xml:space="preserve">Si hæc ſumma exacte fuiſſet 12 horarum, horologium re-
              <lb/>
            cte dispoſitum fuiſſet, ſed cum excedat 12. </s>
            <s xml:id="echoid-s4354" xml:space="preserve">horas 1. </s>
            <s xml:id="echoid-s4355" xml:space="preserve">minuto 47.
              <lb/>
            </s>
            <s xml:id="echoid-s4356" xml:space="preserve">ſecundis, tanto citius promotum fuit ſpatio octidui; </s>
            <s xml:id="echoid-s4357" xml:space="preserve">& </s>
            <s xml:id="echoid-s4358" xml:space="preserve">
              <lb/>
            hoc 1 minutum & </s>
            <s xml:id="echoid-s4359" xml:space="preserve">47 ſecunda, aut 107 ſecunda, diviſa per
              <lb/>
            8. </s>
            <s xml:id="echoid-s4360" xml:space="preserve">efficiunt 13. </s>
            <s xml:id="echoid-s4361" xml:space="preserve">{3/8} ſecundorum, differentiam in ſpatio 24. </s>
            <s xml:id="echoid-s4362" xml:space="preserve">hora-
              <lb/>
            rum. </s>
            <s xml:id="echoid-s4363" xml:space="preserve">Quâ differentià cognitâ, ſi non otium nec animus ſit
              <lb/>
            ſuſcipiendi moleſtiam ut adaptetur horologium ad veram men-
              <lb/>
            ſuram, neceſſe hoc non eſt; </s>
            <s xml:id="echoid-s4364" xml:space="preserve">ita enim in navim inferre licet,
              <lb/>
            modo prædicta quotidiana differentia annotetur, & </s>
            <s xml:id="echoid-s4365" xml:space="preserve">ad eam
              <lb/>
            nosmet componamus ut ſtatim dicetur.</s>
            <s xml:id="echoid-s4366" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4367" xml:space="preserve">Sed ſi accuratius Horologium diſponere velimus, removen-
              <lb/>
            dum eſt minus pondus penduli parumper deorſum, quo tardius
              <lb/>
            movebitur: </s>
            <s xml:id="echoid-s4368" xml:space="preserve">& </s>
            <s xml:id="echoid-s4369" xml:space="preserve">tum de novo obſervatio per ſolem inſtituenda
              <lb/>
            eſt ut antea; </s>
            <s xml:id="echoid-s4370" xml:space="preserve">ſi tarde nimis motum fuiſſet, ſupra memora-
              <lb/>
            tum pondus parumper ſurſum promovendum fuiſſet,
              <lb/>
            ita tamen, ne ſupra punctum medium penduli promoveatur.
              <lb/>
            </s>
            <s xml:id="echoid-s4371" xml:space="preserve">eâ quippe gaudet proprietate, quod inde ſurſum promotum
              <lb/>
            horologium lentius iterum promoveat, cujus rei in deſcri-
              <lb/>
            ptione Horologii datur demonſtratio ; </s>
            <s xml:id="echoid-s4372" xml:space="preserve">ut & </s>
            <s xml:id="echoid-s4373" xml:space="preserve">æquationis
              <note symbol="*" position="right" xlink:label="note-0275-02" xlink:href="note-0275-02a" xml:space="preserve">Vide ſu-
                <lb/>
              pra pag 172.</note>
            poris, cujus ſolummodo hic docemus uſum. </s>
            <s xml:id="echoid-s4374" xml:space="preserve">Præter </s>
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