Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica

Table of figures

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[21] Fig. 5.B E D A C G F
[Figure 22]
[23] Pag. 340.TAB. XXXVII.Fig. 1.C G H F E DH A X Q Y T N V B G
[24] Fig. 3.γ A F D X B P N V E Q C
[25] Fig. 2.K C Δ R Θ Z O Γ D I
[26] Fig. 4.A B D C Π Φ N E S P F
[27] Fig. 2.M E Ψ Λ Φ S Ξ Π Ρ Σ Ω F L
[28] Fig. 5.K B Δ E Z A C R O D Θ Γ I
[Figure 29]
[Figure 30]
[Figure 31]
[32] Pag. 366.TAB.XXXVIII.Fig. 1.B E F G A D C
[33] Fig. 2.E F G B A C
[34] Fig. 3.B E D C A F
[35] Fig. 4.D G E F I B K M N H L A C
[36] Fig. 5.HD A B C
[37] Fig. 6.E D C B F G A
[38] Fig. 8.D E G B A F C
[39] Fig. 7.N G H I KE L M A P C O F B D
[40] Pag. 376.TAB. XXXIXFig. 1.E K C B A L H G D F
[41] Fig. 2.D B G H C E F
[42] Fig. 4.E C G A F B D
[43] Fig. 3.E C D F G H I
[44] Fig. 5.B F R C P L M O
[45] Fig. 6.Y S H E K B C G F R A L D N P M Z X V T
[46] Fig. 7.G F D M L E A K C B H
[47] Pag. 386.TAB. XL.Fig. 2.K B H F G E A I D L C
[48] Fig. 1.L K E D H C A G B
[49] Fig. 3.B Q N L M F G S H K A D C P
[50] Fig. 4.B G R A C D E H F
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          <pb o="326" file="0028" n="29" rhead="THEOR. DE QUADRAT."/>
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        <div xml:id="echoid-div36" type="section" level="1" n="17">
          <head xml:id="echoid-head29" xml:space="preserve">
            <emph style="sc">Theorema</emph>
          VIII.</head>
          <p style="it">
            <s xml:id="echoid-s354" xml:space="preserve">IN ſemicirculo & </s>
            <s xml:id="echoid-s355" xml:space="preserve">quolibet circuli ſectore, habet
              <lb/>
            arcus ad duas tertias rectæ ſibi ſubtenſæ hanc ra-
              <lb/>
            tionem, quam ſemidiameter ad eam, quæ ex centro
              <lb/>
            ducitur ad ſectoris centrum gravitatis.</s>
            <s xml:id="echoid-s356" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s357" xml:space="preserve">Eſto primùm ſemicirculus A B C, deſcriptus centro D,
              <lb/>
              <note position="left" xlink:label="note-0028-01" xlink:href="note-0028-01a" xml:space="preserve">TAB. XXXVI.
                <lb/>
              Fig. 3.</note>
            ſectuſque bifariam rectâ B D, in qua centrum gravitatis
              <lb/>
            ſemicirculi ſit E . </s>
            <s xml:id="echoid-s358" xml:space="preserve">Dico arcum A B C eſſe ad duas
              <note symbol="1" position="left" xlink:label="note-0028-02" xlink:href="note-0028-02a" xml:space="preserve">Theor. 4. h.</note>
            A C, ſicut B D ad D E. </s>
            <s xml:id="echoid-s359" xml:space="preserve">Jungantur enim A B, B C. </s>
            <s xml:id="echoid-s360" xml:space="preserve">Igi-
              <lb/>
            tur, ut ſemicirculus ad triangulum A B C, ſic ſunt duæ ter-
              <lb/>
            tiæ B D ad D E , eſt enim B D æqualis diametro
              <note symbol="2" position="left" xlink:label="note-0028-03" xlink:href="note-0028-03a" xml:space="preserve">Theor. 7. h.</note>
            nis reliquæ. </s>
            <s xml:id="echoid-s361" xml:space="preserve">Verùm etiam ut ſemicirculus, id eſt, ut trian-
              <lb/>
            gulus habens baſin æqualem arcui A B C & </s>
            <s xml:id="echoid-s362" xml:space="preserve">altitudinem B D,
              <lb/>
            ad A B C triangulum, ita eſt arcus A B C ad A C re-
              <lb/>
            ctam; </s>
            <s xml:id="echoid-s363" xml:space="preserve">ergo ut arcus A B C ad A C, ita ſunt duæ tertiæ
              <lb/>
            B D ad D E, & </s>
            <s xml:id="echoid-s364" xml:space="preserve">permutando, ut arcus A B C ad duas tertias
              <lb/>
            B D, ita A C ad D E, ſive ita {2/3} A C ad {2/3} D E, unde rur-
              <lb/>
            ſus permutando, ut arcus A B C ad {2/3} A C, ita {2/3} B D ad {2/3}
              <lb/>
            D E, ſive ita, B D ad D E.</s>
            <s xml:id="echoid-s365" xml:space="preserve"/>
          </p>
          <note position="left" xml:space="preserve">TAB. XXXVI.
            <lb/>
          Fig. 4.</note>
          <p>
            <s xml:id="echoid-s366" xml:space="preserve">Sit deinde ſector D A B C, ſemicirculo minor, bifariam
              <lb/>
            ſectus rectâ D B, in qua ſectoris centrum gravitatis ponatur
              <lb/>
            E punctum, & </s>
            <s xml:id="echoid-s367" xml:space="preserve">ducatur ſubtenſa A C. </s>
            <s xml:id="echoid-s368" xml:space="preserve">Dico rurſus, arcum
              <lb/>
            A B C ad duas tertias rectæ A C eam habere rationem,
              <lb/>
            quam B D ad D E. </s>
            <s xml:id="echoid-s369" xml:space="preserve">Jungantur enim A B, B C, & </s>
            <s xml:id="echoid-s370" xml:space="preserve">totius
              <lb/>
            circuli ſit diameter K D B, quæ producatur in Q, ut fiat
              <lb/>
            Q F, ad B F, ſicut portio A C B ad A B C triangulum,
              <lb/>
            & </s>
            <s xml:id="echoid-s371" xml:space="preserve">jungantur A Q, Q C; </s>
            <s xml:id="echoid-s372" xml:space="preserve">erit jam triangulus A Q C portio-
              <lb/>
            ni A C B æqualis. </s>
            <s xml:id="echoid-s373" xml:space="preserve">Ponantur deinde centra gravitatis, G tri-
              <lb/>
            anguli A C D, & </s>
            <s xml:id="echoid-s374" xml:space="preserve">H portionis A C B; </s>
            <s xml:id="echoid-s375" xml:space="preserve">& </s>
            <s xml:id="echoid-s376" xml:space="preserve">ſicut D Q ad
              <lb/>
            Q F, ita ſit H D ad D R.</s>
            <s xml:id="echoid-s377" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s378" xml:space="preserve">Quia igitur ſicut portio A C B ſive triangulus A Q C ad
              <lb/>
            triangulum A B C, id eſt, ut Q F ad B F, ita {2/3} K F ad
              <lb/>
            D H , erit rectangulum ſub Q F, D H, æquale
              <note symbol="3" position="left" xlink:label="note-0028-05" xlink:href="note-0028-05a" xml:space="preserve">Theor. 7. h.</note>
            </s>
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