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

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              <s>
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              THEOREMA VII.
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              </s>
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              <s>
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              Impulſus centri grauitatis totus mouet, cùm huius interuallum ab
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              hypomochlio eſt œquale ſemidiæmetro figuræ motús.
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              <s>Impulſus enim centri grauitatis prohibetur à motu; cùm vel
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              ipſum centrum, vel pars aliqua à centro mota in hypomochlio
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              quieſcit. </s>
              <s>At verò cùm interuallum centri grauitatis eſt æqua­
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              le ſemidiametro figuræ motûs;
                <expan abbr="neq;">neque</expan>
              ipſum centrum,
                <expan abbr="neq;">neque</expan>
              ali­
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              qua pars à centro mota in hypomochlio quieſcit: totus igitur
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              impulſus movet. </s>
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            <p type="main">
              <s>
                <emph type="center"/>
              THEOREMA VIII.
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              </s>
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              <s>
                <emph type="italics"/>
              Impulſus movens ad totum impulſum rationem habet, quam ſegmen­
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              tum ſemidiametri ab hypomochlic & centro grauitatis interceptum, ad
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              ſemidiametrum figuræ motûs.
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              </s>
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              <s>Cùm hypomochlium ſit trutina;
                <expan abbr="totusq;">totusque</expan>
              impulſus quieſcat,
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              cùm centrum hypomochlio occurrit, per theor. 6 totus verò
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              impulſus moveat, cùm huius à centro intervallum eſt æquale
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              ſemidiametro figuræ motùs per theore: 7. erit impulſus mo­
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              uens æqualis ſegmento ſemidiemetri inter centrum grauitatis
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              &
                <expan abbr="hypomochliũ">hypomochlium</expan>
              intercepto In figurâ
                <expan abbr="ſequẽti">ſequenti</expan>
              BEC ſit A
                <expan abbr="centrũ">centrum</expan>
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              grauitatis, DE hypomochlium, & AC ſimidiameter æqualis
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              toti impulſui:
                <expan abbr="eritq;">eritque</expan>
              DA interuallum centri grauitatis A &
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              hypomochlij DE, grauitas mouens centri A. </s>
              <s>Vt enim AD ad
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              vectem AC; ita per Axioma 2. ratio impulſús ex eodem pon­
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              dere A appenſo. </s>
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          </chap>
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