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

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              <s>
                <pb xlink:href="063/01/077.jpg"/>
              nummum inter duos digitos contentum excutiant. </s>
              <s>Mulieres
                <lb/>
                <expan abbr="quoq;">quoque</expan>
              Balearicæ non priùs cibum ſuis filijs præſtabant, quàm
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              iactu fundæ eundem attigiſſent. </s>
              <s>Et ne remotiora ſectemur,
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              an non ictus tormentorum adeo certi; ut globi ab his emiſſi per
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              ipſum os tormenti oppoſiti ſe inferant? </s>
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              <s>Pro quo notandum ex his, quæ in libro de motu poſtea di­
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              centur,
                <expan abbr="utrumq;">utrumque</expan>
                <expan abbr="motũ">motum</expan>
              , videlicet naturalem, & qui ex impulſu
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              cauſatur, efficienter quidem à principio interno mobilis; de­
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              terminatiuè verò ab ideâ provenire. </s>
              <s>Quæ ſi ab extra veniat,
                <lb/>
              motum non naturalem; idea verò interna & à principijs eſſen­
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              tialibus fluens motum naturalem determinat:
                <expan abbr="atq;">atque</expan>
              ſi ad mun­
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              di centrum dirigat, grauitas nun cupatur. </s>
              <s>Fit autem hic mo­
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              tus mediante impulſu: qui cùm neceſſariò producatur, neceſsè
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              hunc in deſcenſu continuò augeri per prop: 10. </s>
              <s>Idea verò ex­
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              terna impulſum determinat ſimilem vel diſſimilem grauitati. </s>
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              <s>Et ſiquidem impulſus accedat ſimilis illi, qui prouenit à gravi­
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              tate; dico ab
                <expan abbr="utroq;">utroque</expan>
              ſimul fieri motum: ſiue impulſus ſit ma­
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              ior, ſiue minor gravitate. </s>
              <s>Et impulſum quidem maiorem
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              grauia incitare videtur manifeſtum. </s>
              <s>Quòd ab hoc, non verò
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              à gravitate fiant incrementa motûs: qui in omni puncto eſt
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              maior gravitate, per prop: 11. </s>
              <s>Idem verò dicendum de im­
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              pulſu minori. propterea quòd grauitas non niſi mediante im­
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              pulſu moueat: omnis verò acceſſio impulſûs auget præexi­
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              ſtentem, & ad motum incitat velociorem, per poſit: 4. </s>
              <s>Quôd
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              ſi motus ſit non naturalis, cuiuſmodi ſagittæ, vel erit contrari­
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              us abſolutè; qui nimirum fit per eandem lineam rectam: vel
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              ſubcontrarius, angulum continens cum lineâ deſcenſus mino­
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              rem duobus rectis. </s>
              <s>Ft prioris quidem generis, ſi æqualis ſit
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              gravitati, nullus omninò fit motus; verùm mobile tum quie­
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              ſcit. </s>
              <s>Propterea quòd deſcenſus grauium fiat mediante </s>
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