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

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              THEOREMA XVII.
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              Fieri poteſt ut idem parallelogrammum mutato ſitu moueatur, &
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              quieſcat in codem plano inclinato.
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                <emph.end type="center"/>
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              <s>Aſſumatur inclinatio plani æqualis angulo EDB: cadetq,
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              linea hypomochlij DE in centrum figuræ. </s>
              <s>Et quia tum cen­
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              trum grauitatis hypomochlio occurrit, quieſcet
                <expan abbr="parallelogrã-mum">parallelogran­
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                mum</expan>
              in co ſitu, per theorema 6. </s>
              <s>Cùm verò angulus ECD ſit
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              maior angulo inclinationis EDB; ſi ex C ducatur linea hypo.
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              mochlij, cadet inter EC. DC: ac proinde centrum figuræ ex­
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              tra hypomochlium motum continuabit in eodem plano. </s>
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              THEOREMA XIX.
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              Motus circuli in eodom plano inclinato eſt velocior motufiguræ
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              rectilineæ.
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              <s>Moueatur in eodem plano AN circulus GCA, atq, penta­
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              gonum BILMN: Dico motum circuli eſſe velociorem. </s>
              <s>Aſſu­
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              matur radius EA æqualis ON & ducantur lineæ hypomochlij
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              AC. NR ſecetur autem ſemidiameter figuræ motús OQ bifa­
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              riam & æqualiter in P: ut ſit OP æqualis
                <expan abbr="Pq.">Pque</expan>
              per primum
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              lemma: dico EF maioren rationem habere ad FG, quàm OP
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              ad OQ Nam quia rectus eſt angulus DAE, & angulus BNO
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              ſemiſſis anguli pentagoni minor recto: ſunt verò anguli DAC.
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              BNP einſdem inclination is ex hypotheſi æquales: erit angu­
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              lus reliquus FAE maior angulo reltquo PNO. </s>
              <s>Et quia OP
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              per conſtructionem eſt æqua is PQ, ſi iungatur recta NQ, erit
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              angulus PNQ æqualis angulo ONP, maior verò angulo BNP,
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              hoc eſt illi æquali angulo DAF: ac proinde maior
                <expan abbr="quoq;">quoque</expan>
              </s>
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