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

Table of figures

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[131] Fig. 12.* 29. Apr.
[132] Fig. 13.* 3. Maii.
[133] Fig. 14.* 6. Maii.
[134] Fig. 15.* 7. Maii.
[135] Fig. 16.* 10. Maii.
[136] Fig. 17.* 11. Maii.
[137] Fig. 18.* 12. Maii.
[138] Fig. 19.* 14. Maii.
[139] Fig. 20.* 15. Maii.
[140] Fig. 21.* 18. Maii.
[141] Fig. 22.* 19. Maii.
[142] Fig. 23.* 20. Maii.
[143] Fig. 24.* c a * 27. Maii.
[144] Fig. 25.c * 31. Maii. a *
[145] Fig. 26.* 13. Iun.
[146] Fig. 27.* 16. Ian. 1656.
[147] Fig. 28.* 19. Febr.
[148] Fig. 29.* 16. Mart.
[149] Fig. 30.* 30. Mart.
[150] Fig. 31.* 18. Apr.
[151] Fig. 32.* 17. Iun.
[152] Fig. 33.* 19. Oct.
[153] Fig. 34.* 21. Oct.
[154] Fig. 35.* 9. Nov.
[155] Fig. 36.* 27. Nov.
[156] Fig. 37.* 16. Dec.
[157] Fig. 38.* 18. Ian. 1657.
[158] Fig. 39.* 29. Mart.
[159] Fig. 40.* 30. Mart.
[160] Fig. 41.* 18. Maii.
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              <pb file="0130" n="139" rhead="PRÆFATIO AD LECTOREM."/>
            lum hinc fructum colliges.</s>
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        <div xml:id="echoid-div143" type="section" level="1" n="62">
          <head xml:id="echoid-head93" xml:space="preserve">DEFINITIONES.</head>
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            <s xml:id="echoid-s2728" xml:space="preserve">1 Si in circulo, ellipſe vel hyperbola ducantur è centro
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            in ejus perimetrum duæ rectæ, appellamus planum
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            ab illis rectis & </s>
            <s xml:id="echoid-s2729" xml:space="preserve">perimetri ſegmento comprehenſum,
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            ſectorem.</s>
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          <p>
            <s xml:id="echoid-s2731" xml:space="preserve">2 Si perimetri ſegmentum inter illas rectas comprehenſum à
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            rectis quotcumque ſubtendatur, ita ut triangula rectili-
              <lb/>
            nea (quorum communis vertex eſt ſectionis centrum & </s>
            <s xml:id="echoid-s2732" xml:space="preserve">
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            baſes rectæ ſubtendentes) ſint æqualia; </s>
            <s xml:id="echoid-s2733" xml:space="preserve">vocamus rectili-
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            neum illud ab iſtis triangulis conflatum, polygonum re-
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            gulare inſcriptum, ſi ſectio conica fuerit circulus vel el-
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            lipſis; </s>
            <s xml:id="echoid-s2734" xml:space="preserve">quod ſi fuerit hyperbola, vocamus illud rectili-
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            neum polygonum regulare circumſcriptum.</s>
            <s xml:id="echoid-s2735" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2736" xml:space="preserve">3 Si perimetri ſegmentum inter illas rectas comprehenſum à
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            rectis quotcunque tangatur & </s>
            <s xml:id="echoid-s2737" xml:space="preserve">à tactibus ad ſectionis cen-
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            trum ducantur rectæ; </s>
            <s xml:id="echoid-s2738" xml:space="preserve">ſi inquam omnia trapezia, a tan-
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            gentibus proximis & </s>
            <s xml:id="echoid-s2739" xml:space="preserve">rectis ad centrum comprehenſa, fue-
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            rint æqualia; </s>
            <s xml:id="echoid-s2740" xml:space="preserve">appello rectilineum ab illis conflatum, poly-
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            gonum regulare circumſcriptum, ſi ſectio conica ſit elli-
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            pſis vel circulus, & </s>
            <s xml:id="echoid-s2741" xml:space="preserve">polygonum regulare inſcriptum ſi
              <lb/>
            fuerit hyperbola.</s>
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          <p>
            <s xml:id="echoid-s2743" xml:space="preserve">4 Si omnes anguli (excepto illo ad ſectionis centrum) po-
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            lygoni regularis à ſubtendentibus comprehenſi </s>
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