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

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              THEOREMA II.
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              </s>
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              <s>
                <emph type="italics"/>
              Si duo Orbiculi ſimul iuncti & æquales percutiant alium maiorem,
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              duobus autem illis ſimul ſumptis æqualem; orbiculo ſuperiori reflexo,
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              motum continuat baſis.
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              </s>
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            <p type="main">
              <s>Difficultas hic eſt, quòd cùm orbiculus ſolidus percutit ali­
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              um ſibi æqualem, illo moto quieſcit: cur igitur non idem fit,
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              cùm duo ſimul iuncti,
                <expan abbr="atq;">atque</expan>
              eidem æquales hunc percutiunt, ve.
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              rùm
                <expan abbr="uterq;">uterque</expan>
              inæqualiter movetur ex illâ plagâ? Nam eodem
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              impulſu agi videntur: neceſſe ergo eandem inferre plagam:
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              Et cùm gravitas orbiculi maioris ſit dupla, & impulſum reci­
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              piat duplum illius, quo ſinguli moventur; erit
                <expan abbr="quoq;">quoque</expan>
              eadem ve­
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              locitas motûs. </s>
              <s>At verò ſi baſis ſequitur motum maioris; ne­
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              ceſſe huius motum eſſe velociorem quàm baſis motum: quæ
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              ab incipiente & necdum perfectâ plagâ movetur. </s>
              <s>Et ſi refle­
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              ctit alter orbiculus: quia peractâ huius plagâ necdum incipit
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              moveri maior; velocitatem habebit minorem. </s>
              <s>Pro ſolutione
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              dico, impulſum in
                <expan abbr="utroq;">utroque</expan>
              orbiculo eſſe æqualem. </s>
              <lb/>
              <s>Secundô inæqualiter moveri,
                <expan abbr="magisq;">magisque</expan>
              impediri motum baſis
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              per 1 Theor: huius; & cùm impulſum determinet motus; ma
                <lb/>
              iori tempore plagam perficiet baſis. </s>
              <s>Cùm ergò maior orbi­
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              culus gravitatem habeat duplam; ad illam velocitatem mo­
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              tûs, non niſi ab impulſu duplo perducitur: perfectâ autem pla­
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              gâ unius orbiculi, necdum percuſſit alter:
                <expan abbr="neq;">neque</expan>
              igitur ex illâ
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              plagâ ſe abducit orbiculus maior: ac proinde orbiculus, qui
                <lb/>
              iam percuſſit, reflectit. </s>
              <s>Et quia minor eſt velocitas motûs
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              baſis, velociùs movebitur ab
                <expan abbr="utraq;">utraque</expan>
              plagâ. igitur ad illam ve­
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              locitatem, quâ movetur baſis, ab incipiente & necdum perfe­
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              ctâ huius plagâ perducetur: ac proinde reliquus impulſus mo­
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              tum continuabit. </s>
              <s>Idem autem fit, ſi alter orbiculus ſit paulo </s>
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