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

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              ſegmentum GKFI aſſumit in eâ tatione grauitare, in qua eſt
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              pars magnitudinis| Sphæræ? cùm & partium magnitudo ob
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              curvitatem circuli, & ſitus continuò mutentur. </s>
              <s>Propoſ.
                <expan abbr="autẽ">autem</expan>
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              illa ſecunda in Archimede promoto,
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              impulſum partis in eà ratione
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              eſſe ad impulſum totius, in quà ipſa eſt pars magnitudinis
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              , vera eſt, ſi
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              non ratione ſitûs mutetur illa habitudo. </s>
              <s>Sed quidquid ſit de
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              hac proportione partium ad ſe, quam in circulo ignoramus,
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              nihil huc facit: ubi centrum grauitatis in eadem magnitudi­
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              ne expendimus, & ad ſe ipſum comparamus: quatenus in di­
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              uerſo ſitu & remotione ab hypomochlio inæqualiter ponderat. </s>
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              <s>Deinde verò efto demus Impulſum diuidi in eâ ratione, in quâ
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              magnitudo; vt quæ pars ſit molis, eadem ſit grauitatis ſeu im­
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              pulſus: an propterea rectè infert in eadem ratione fieri mo­
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              tum? Vt ſi ſegmentum GHFI ſit duplum ſegmenti GHF,
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              ac proinde grauitatem habeat duplam, duplo velociùs moue­
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              ri ſit neceſſe: id enim quæſtione de in æquali ponderum la­
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              pſu negamus. </s>
              <s>Malè autem propoſ: 10. citat in contrarium: quæ
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              ponit impuiſum producere motum ſibi æqualem. hoc enim de
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              intenſione, non verò extenſione grauitatis ſeu impulſûs eſt in­
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              telligendum: ita nimirum ſi idem mobile accipiat impulſum
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              duplum. </s>
              <s>At verò cùm acceſſione partis nouæ augetur impul­
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              ſus, nihilo plus virium ad ſe mouendum
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              habet. </s>
              <s>Quòd
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              ſi ex toto mobili grauitas ſeu impulſus colligi poſſit in partem
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              V.G tertiam; tum verò pars illa celeritate triplà moueretu.
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              Nam ſicuti impulſus magnus in magnam molem receptus ex­
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              tenuatur: ita in paruam molem contractus intenditur. </s>
              <s>Atq:
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              ex his patet manifeſtè, in conuellendâ illâ prop. 13. & falſa aſ­
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              ſumi, & ex malè aſſumptis vitiosè concludi. </s>
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              <s>Alter fuit R. P. Joannes Ciermans: qui in anno poſitio­
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              num Mathematicarum, hebdomade tertiâ, menſis Maij, ita in­
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              quit. </s>
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              Putat Ioannes Marcus Marciſeſe globum ſummà violentià
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