Marci of Kronland, Johannes Marcus, De proportione motus figurarum recti linearum et circuli quadratura ex motu, 1648

Table of figures

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                <pb xlink:href="063/01/073.jpg"/>
                <emph type="italics"/>
              af
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              faciens cum rectâ
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              ad
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              angulum
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              fad
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              grad. 30. ſemiſſem
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              complementi anguli reflexionis. </s>
              <s>Secet autem
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              ad
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              producta
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              latus trianguli
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              bc
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              ad angulos rectos: dico triangulum
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              abc
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              in hoc ſitu à lapſu verticali reflecti ad grad-30. </s>
              <s>Ducatur enim
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              à centro figuræ recta
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              de
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              perpendicularis ad
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              af.
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              Et fiat ut
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                <emph type="italics"/>
              ae
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              ad
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              ed,
                <emph.end type="italics"/>
              ita
                <emph type="italics"/>
              dg
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              ad
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              di:
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                <expan abbr="eritq;">eritque</expan>
                <emph type="italics"/>
              dh
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              motus centri à reflexi­
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              one. </s>
              <s>Cuiex
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              a
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              ducatur parallela
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              ac.
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              Quia
                <expan abbr="itaq;">itaque</expan>
              angulus
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              e
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              ad
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              eſt grad. 30. per conſtructionem; æqualis autem angulo
                <emph type="italics"/>
              g
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              dh,
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              hoc eſt illi æquali
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              dai:
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              erit angulus compoſitus
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              fai
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              grad:
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              60, ac proinde angulus reliquus
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              caz
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              grad. 30. </s>
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              PROBLEMA II.
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            <p type="main">
              <s>
                <emph type="center"/>
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              Motum verticalem quadrati à plano reflectere ad angulum datum.
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                <emph.end type="center"/>
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            <p type="main">
              <s>Inveniendus ſit angulus reflexionis grad. 40. </s>
              <s>Ductâ
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              ag
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              li­
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              neâ hypomochlij, fiat angulus
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              gae
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              grad: 25. ſemiſſis comple­
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              menti anguli reflexionis. </s>
              <s>Et ex centro figuræ producatur
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              ef
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              </s>
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