Ceva, Giovanni, Geometria motus, 1692

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              do arcus incuruatur, breuiores fiunt, quàm eſſent anteą.
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              <s id="s.000914">Reſpondeo, quòd corda ao cùm ſit obliquior reſpectu
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              longitudinis ae, quàm reſpectu cæterarum centro propin­
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              quiorum, hinc fit vt, quantùm eſt ex hac ratione, faciliùs
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              aperiantur partes propinquiores centro; quamobrem, vtra­
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              que ratione inuicem temperata, dummodo arcus non ſit
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              ſummè incuruatus omnes partes aperientur, quantum ſa­
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              tis eſt ad intentum. </s>
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              <s id="s.000915">Altera difficultas eſt, quod elaterium quodlibet dum
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              reſtringitur videtur obſtare motui elaterij ſequentis. </s>
              <s id="s.000916">Nam,
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              exempli gratia, in elaterio B ſemiannulus reſpiciens extre­
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              mum A, dum ſtringitur, optimè præſtat ſuum effectum,
                <expan abbr="cũ">cum</expan>
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              eius motus ſit versùs centrum M At è contrario reliqua
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              pars, ſeu ſemiannulus reſpiciens prædictum centrum M,
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              habeat ſuum motum verſus A videtur obſtare, quo minus
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              liberè claudatur ſequens elaterium C. </s>
              <s id="s.000917">Aque idem de cæte­
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              ris dicendum. </s>
              <s id="s.000918">Huic incommodo conſultum eſt augendo
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              magnitudinem, & craſſitiem elateriorum, quò magis acce­
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              dunt ad centrum M. </s>
              <s id="s.000919">Hinc enim ſequitur vt propter ma­
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              gnitudinem facilè conſentiant arcui, dum incuruatur; at
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              dum idem arcus liberè ſibi relinquitur, cum ſint corpulen­
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              tiora & craſſiora habent maius momentum, quàm cætera
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              graciliora, ideoque non modo vincunt motum illum op­
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              poſitum, ſed etiam imprimunt maiorem motum ferro ar­
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              cus, cui ille motus communicatur. </s>
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              <s id="s.000920">Aduerte quod commiſſuræ ſeu nodi, quò plures fuerint,
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              elateria autem maioris ponderis, arcus denique corporis
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              gracilioris equæ expeditioris, tanto ictus longat præſtan­
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              tior ſequetur, tum propter notabilem curuaturam brachio­
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              rum, tum propter momentum maius elateriorum, &
                <expan abbr="quidẽ">quidem</expan>
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              poſita eadem potentia, aut etiam minori, pro vt longitudi­
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              nes vectium ſtatuuntur. </s>
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              <s id="s.000921">Aduerte etiam, longitudinem brachij AE, eiuſdemquę
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              correſpondentis debere cæteris paribus nonnihil imminui, </s>
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