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

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              totam, motum producet ſibi æqualem, hoc eſt duplum. </s>
              <s>Jm­
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              meritò hic aliqui turbantur,
                <expan abbr="hæſitantq;">hæſitantque</expan>
              quia inquiunt, licet
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                <expan abbr="quandoq;">quandoque</expan>
              velocius feratur in eodem tempore per ſpatium du­
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              plum, non tamen conſtare an illa virtus Locomotiua ſit du­
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              pla, an in aliâ proportione. </s>
              <s>Verùm hi naturam grauitatis &
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              Impulſus videntur ignorare, illam ceu ex atomis conflantes:
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              quæ proinde aliquo numero, aut magnitudine ſit menſurabi­
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              lis. </s>
              <s>At verò quis qualitates ſenſum latentes, & vix ab animo
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              perſpici valentes menſurabit? quin ipſam coulis ſubiectam al­
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              bedinem quis duplam alteri dabit: Sicuti ergo illas qualita­
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              tes non niſi ex effectu noſcim
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              9
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              ; ita ex huius partitione in partes
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              analogas ſecamus: ut dupla ſit virtus, quæ effectum producit
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              duplum; impulſus ergo ſeu grauitas dicetur dupla, quæ mo­
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              tum valet producere duplum. </s>
              <s>Eſt autem de ratione motus
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              habere extenſionem, & in tempore fieri determinato: & ut
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              tanto magis ſit perfectus, quanto| minùs temporis inſumit. </s>
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              <s>Semiſſis ergo temporis, perfectionem dabit duplam. & quia in
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              altera ſemiſſe motum producit æqualem, perfectio dupla, eo­
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              dem tempore mouebit per ſpatium duplum. </s>
              <s>Confirmatur
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              ex ijs, quæ poſtea dicam ad quæſt. de cauſa inæqualis reflexio­
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              nis: nimirum motum eſſe plagam continuatam in illo medio,
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              in quo fit motus:
                <expan abbr="atq;">atque</expan>
              impulſum à plagâ incipientem in aliam
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              plagam illi æqualem deſtinari: quâ conſecutâ motus termi­
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              natur. </s>
              <s>Cùm ergo Impulſus ſit æqualis plagæ, neceſſe illam
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              in motu continuatam plagam huic eſſe æqualem. & quia medi­
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              um unius eſt rationis,
                <expan abbr="neq;">neque</expan>
              magis in una, quàm aliâ parte reſi­
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              ſtit, erunt partes medij in eâ ratione, in quâ illarum plaga. </s>
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              <s>Medium ergo duplum abſumet plagam duplam. </s>
              <s>At verò Pla­
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              ga dupla non niſi ab impulſu æquali, id eſt duplo eſſe poteſt:
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              Impulſus ergo duplus per medium mouebit duplum. </s>
              <s>De­
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              inde cùm velocitas motûs proueniat à minori reſiſtentia me-</s>
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