Biancani, Giuseppe, Aristotelis loca mathematica, 1615

Table of figures

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            <p type="main">
              <s id="s.003969">
                <pb pagenum="232" xlink:href="009/01/232.jpg"/>
              no ſatis ab illo foramine remoto, vt in pariete, vel pauimento, non recipi­
                <lb/>
              tur in eadem figura, per quam ingreſſum eſt; quamuis. </s>
              <s id="s.003970">n. </s>
              <s id="s.003971">foramen ſit angulo­
                <lb/>
              ſum, illuminatio tamen in oppoſito plano facta eſt ſemper circularis, ſi pla­
                <lb/>
              num ſit ſatis remotum, & radio Solis directè, ſeu perpendiculariter obie­
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              ctum: ſi enim non ſit perpendiculariter, ſed obliquè, tunc illuminationes
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              apparent non omnino circulares, ſed ouales; quemadmodum quotidie ac­
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              cidere videmus in pauimentis, vbi omnes ferè huiuſmodi illuminationes
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              ellipſes ſunt, quamuis Sol per anguloſa foramina ingrediatur. </s>
              <s id="s.003972">quæ ellipſes ſi
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              in plano Solis radio
                <expan abbr="perpẽdiculariter">perpendiculariter</expan>
              obiecto recipiantur, perfecti euadunt
                <lb/>
              orbes. </s>
              <s id="s.003973">hoc etiam, inquit Ariſt, in cratibus patet; crates enim illæ habebant
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              foramina anguloſa, atque oblonga, fiunt enim crates ex virgis decuſſatis,
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              quorum foramina ſunt quadrilatera, per quæ Sol ingrediens, non tamen
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              recipit anguloſam figuram, ſed in debita remotione rotundatur. </s>
              <s id="s.003974">Reſpon­
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              det propoſitæ quæſtioni dicens; radijs Solis fortè illud accidere, quod & ra­
                <lb/>
              dijs viſualibus, qui ab oculo ad rem conſpectam producuntur: ij enim in
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              turbinis, ſeu coni figuram aguntur, cuius apex eſt in oculo, baſis autem eſt
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              in re viſa: & quamuis res viſa ſit anguloſa, vt triangula, vel quadrangula,
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              tamen ſi à longè conſpiciatur, circularis apparet; vnde & figura viſualium
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              radiorum, quæ in proximum obiectum incidens baſim anguloſam, remoto,
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              quantum ſatis eſt, obiecto, baſim habebit orbicularem. </s>
              <s id="s.003975">eodem igitur modo
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              de Solis radijs exiſtimare debemus: qui quamuis per anguloſa foramina in­
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              trent, tamen, ſi in remoto obiecto recipiantur, figuram circularem ſortien­
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              tur: quod ſi non ſatis remoto plano occurrant, anguloſam etiam figuram
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              pro foraminis qualitate efficient: & quidem eo foramini ſimiliorem, quo ei
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              propior erit coni luminoſi baſis. </s>
              <s id="s.003976">vel aliter etiam
                <expan abbr="reſpondẽdum">reſpondendum</expan>
              eſt, hoc mo­
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              do; figura Solis, quæ orbicularis eſt, vndique lineis rectis, ſeu radijs, quos
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              emittit, circundata eſt, qui radij cum intrent per foramina lineis
                <expan abbr="quoq;">quoque</expan>
              re­
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              ctis contenta, accidunt lateribus figuræ foraminis, & propterea cum rectæ
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              lineæ lineis rectis applicentur, deberent hi radij in figuram rectilineam con­
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              formari; quod & faciunt, vt patet in cratium feneſtellis, vbi ſi radij poſt in­
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              greſſum ſtatim in plano quopiam recipiantur, figuram efficiunt feneſtellæ ſi­
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              milem. </s>
              <s id="s.003977">quod ſi in plano, ſatis remoto, deſinant, non amplius anguloſam,
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              ſed circularem illuminationem efficient. </s>
              <s id="s.003978">Cuius cauſa eſt, quia, vt initio di­
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              xi, eodem modo lumen, ſeu radij Solis producuntur, quo etiam radij vi­
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              ſuales, quod inde patere poteſt, quia perſpectiui eadem de
                <expan abbr="vtriſq;">vtriſque</expan>
              & ſuppo­
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              nunt, & oſtendunt. </s>
              <s id="s.003979">quemadmodum igitur quando oculi noſtri aſpectus ad
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              figuram rectilineam, & anguloſam, quæ propinqua ſit directus, eam angu­
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              loſam iudicat, vt re vera eſt, quam deinde longè ſemotam oualem, aut cir­
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              cularem exiſtimat; propterea quod radij viſuales ad extremitates laterum
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              figuræ, ſiue angulos ipſius protenſi euaneſcunt, quia imbecilli admodum
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              ſunt; ſunt autem imbecilli, quia,
                <expan abbr="cũ">cum</expan>
              tendant ad angulos, quæ minimæ partes
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              ſunt obiecti, & quidem longè ſemoti, fit, vt ij anguli ſub angulo adeò paruo
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              ad oculum veniant, vt ſub eo viſio fieri nequeat; idcircò cùm anguli cerni
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              nequeant, obiectum ſub circulari figura apparebit. </s>
              <s id="s.003980">ſed quantum lateris re­
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              cti viſi in turbine viſuali continetur, ac ſub angulo viſioni idoneo ad ocu­
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              lum defertur, id tantum in viſum agere poteſt. </s>
              <s id="s.003981">Reliquum, quod eſt in an­</s>
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