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

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              <s>Inquirendum iam ſit centrum grauitatis in quadrato GHIK.
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              in quo ductis diametris GI. HK; erit per prop. 10. eiuſdem li­
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              bri centrum grauitatis in communi ſectione L. </s>
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              <s>Similiratione inveniemus centrum grauitatis in pentagono
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              isopleuro. ſinimirum ex angulis O & P ducantur lineæ OV.
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              PS perpendiculares ad latus oppoſitum. </s>
              <s>Erit enim centrum
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              grauitatis in communi ſectione T. propterea quòd
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              figu­
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              ram ſecat bifariam: uti manifeſtum, ſi in triangula reſoluatur. </s>
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              THEOREMA X.
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              Motus verticalis figuræ rectilineæ ad motum inclinatum eſt in ratione
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              ſemidiametri figuræ motûs ad huius ſegmentum, quod eſt inter
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              centrum figuræ & lineam hypomochlij.
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              <s>Moveatur triangulum OMN in plano OB: & ex puncto N
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              ducatur linea hypomochlij NS, parallela lateri motus OQ:
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              ex centro autem figuræ P, per proximum Lemma inuento, a­
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              gatur PQ perpendicularis ad OQ Dico motum verticalem
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              in OQ ad motum inclinatum in OB eſſe, ut PQ ad PR. </s>
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              <s>Quia enim gravitas mouens ex præmiſſis, & per poſit. 4- de
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              prop. motûs, eſt æqualis motui; grauitas antem tota, ſeu ver­
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              ticaliter movens ad grauitatem mouentem in OB eſt ut PQ </s>
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