Biancani, Giuseppe, Aristotelis loca mathematica, 1615

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              veluti centro parte E. quia ve­
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              rò ob maris liquiditatem na­
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              uis minimè obſiſtit, ſed facilè
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              cedens à ventis vrgetur, hinc
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              fit, vt meritò dixerim pondus
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              nauis eſſe ad D, fulcimentum
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              verò ad E.</s>
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              <s id="s.002870">Quæſtio ſeptima, & ſatis per
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              ſe clara eſt;
                <expan abbr="neq;">neque</expan>
              Mathemati­
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              ci eſt eam exponere.</s>
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            <p type="head">
              <s id="s.002871">
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              QVÆSTIO OCTAVA
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            <p type="head">
              <s id="s.002872">
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              De Rota.
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            <p type="head">
              <s id="s.002873">Cur ex figurarum genere quæcunque rotundæ ſunt, & cir­
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              culares facilius mouentur?</s>
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              249</s>
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              <s id="s.002876">Tribus autem modis circulum rotari contingit; aut enim ſecun­
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              dum apſidem, ſiue curuaturam centro ſimul moto, quemadmo­
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              dum plauſtrorum rotæ vertuntur: aut circa manentem axem,
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              tanquam centrum veluti rotulæ illæ, ex quibus trochlea compo­
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              nitur; vel quibus ad puteos vtimur, quæ quidem rectæ ad horizontem ſo­
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              lent conſtitui. </s>
              <s id="s.002877">aut quem ad modum rota figuli, quæ pariter circa
                <expan abbr="manẽs">manens</expan>
              cen­
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              trum gyratur, ſed quaſi proſtrata horizonti æquidiſtans collocata eſt. </s>
              <s id="s.002878">Quæ
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              igitur primo modo mouentur, fortè facilius quam figuræ rectilineæ, vt ſunt
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              triangulares, quadratæ, pentagonæ, &c. </s>
              <s id="s.002879">mouentur, quia circulares figuræ
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              parua ſui parte, & quaſi in puncto planum, ſeu pauimentum contingunt, vn­
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              de fit, vt
                <expan abbr="neq;">neque</expan>
              offenſent,
                <expan abbr="neq;">neque</expan>
              impingant; cuius cauſa eſt, quia à terra ſemo­
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              tus eſt angulus, ideſt tali angulo planum contingunt, vt ab eo ſtatim rotæ
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              curuatura à terra eleuari incipiat, & propterea parum terræ hæreat: in fi­
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              guris verò rectilineis, in quadrata. </s>
              <s id="s.002880">v. g. ſecus accidit, quia ab angulo ad an­
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              gulum linea recta tenditur, vnde in ipſius volutatione poſt contactum vnius
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              anguli tota recta linea ſequens, plano adaptabitur, & non ſemouebitur ſta­
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              tim in altum, & ideò multum offenſabit, & impinget,
                <expan abbr="tardeq́">tardeque</expan>
              ; idcircò mo­
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              uebitur. </s>
              <s id="s.002881">Præterea circulares etiam, ſi cui obuiam fiunt corpori, illud ſimi­
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              liter ſecundum puſillum tangunt: rectilineæ verò figuræ, rectitudine ſua
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              plani multum contingerent. </s>
              <s id="s.002882">Ad hæc motor mouens huiuſmodi rotas, eas
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              mouet, quò nutant: nam quando rota erecta eſt ſuper pauimentum, dia­
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              meter ipſius, quæ à contactu pauimenti ad angulos rectos, ad ſupremum </s>
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