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

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              lineam GE per theorem. 5.
                <expan abbr="ſuntq;">ſuntque</expan>
              impulſus ſubcontrarij; erit
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              motus E per prop. 31. de proportione motûs, parallelus lineæ
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              GK mediæ inter GB & GE. </s>
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              LEMMA III.
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              Si figura maior in motu percutiat minorem; habeat verò ſegmentum
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              ſemidiametri figuræ motûs, quod eſt inter lineam hypomochlij, & ex­
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              tremum motûs, maiorem rationem ad reliquum ſegmentum, quod eſt
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              inter eandem lineam hypomochlij & figuræ centrum, quàm habeat mi­
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              nor figura ad maiorem; motus maioris erit parallelus lineæ mediæ inter
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              tangentem circuli & eiuſdem perpendicularem ad contactum.
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              <s>Habeat AF ad EF maiorem rationem, quàm circulus H ad
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              quadratum ABCD: Dico, huius motum ab illâ plagâ eſſe pa­
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              rallelum lineæ mediæ inter GB & GH. </s>
              <s>Quia enim menſura
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              plagæ AF ad reſiduum impulſum in FE maiorem rationem
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              habet, quàm circulus H ad quadratum ABCD: & permu­
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              tando AF ad H, quàm FE ad ABCD, erit velocior motus
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              circuli H, quàm quadrati ABCD. nullam ergo à circulo per­
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              cuſſo recipit plagam. </s>
              <s>Et quia præpondium in E, neceſſe libra­
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              tionem fieri in G: ac proinde motum in E eſſe parallelum lineæ
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              mediæ inter GB & GH. </s>
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              PROBLEMA V.
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              Circulo æquale quadratum ex motu invenire.
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              <s>Percutiat quadratum ABCD circulum H, & ex illâ plagà
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              moveatur centrum E per lineam parallelam lateri GB: duca­
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              tur autem linea hypomochlij FG ſecans ſemidiametrum figu­
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              ræ motûs AE in F. </s>
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                <expan abbr="Eritq;">Eritque</expan>
              per 1. Lemma AF ad FE, ut circulus </s>
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