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

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              puncto B, ad A perneniret lapſu verticali. </s>
              <s>Cùm enim illa duo ſeg­
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              menta Sphærica GHF, GIF, habeant centrum grauitatis in lineà
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              GF: ſit〈que〉 F hypomochlium, æquiponderabunt: quare reliqua tantum
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              Sphæræ pars GKFI deorſum producet impulſum: Quare & im­
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              pulſus motum ſibi æqualem per prop: 2. Doctoris. </s>
              <s>Eſt autem ut pars
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              Sphæræ GKFI ad totam Sphæram, ita partis eiuſdem impulſus ad to­
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              tius Sphæræ impulſum per propoſ: 2. in Archimede promoto: quare & mo­
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              tus partis eiuſdem ad motum totius erit in eadem ratione. </s>
              <s>Permutan­
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              do ergo & velocitas partis ad velocitatem totius per Propoſ.
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              10.
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              Doctor:
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              ergo et interuallum BF ad interuallum BA, uti pars Sphæræ GK
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              FI ad totam Sphæram per propſ: 7. eiuſdem.
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              Sed pars GKFI non eſt ad totam Sphæram uti CD ad DF, quod
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              certum eſt: & patet ex hoc diſcurſu. </s>
              <s>Fingatur enim mente recta H
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              D per verticalem GF diuiſa bifariam. tunc ſi eſſet ut CD ad FD Sim­
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              pla ad duplam, ita reliqua magnitudo (ablatis duobus ſegmentis Sphæ­
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              ricis illis dictis) ad totam: Eſſet etiam tota magnitudo dupla illius
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              partis GKFI: quod ad oculum falſum factâ figurâ apparebit. </s>
              <s>Ergo
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              ne〈que〉 interuallum BF ad interuallum BA, uti CD ad DF, quod
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