Biancani, Giuseppe, Aristotelis loca mathematica, 1615

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            <pb pagenum="125" xlink:href="009/01/125.jpg"/>
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              <s id="s.002154">
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              Additio de Iride.
                <emph.end type="italics"/>
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            <p type="main">
              <s id="s.002155">Cvm ſuperior Ariſtot. de Iride tractatio obſcura, ac tricis pluribus
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              impedita euaſerit,
                <expan abbr="cumq́">cumque</expan>
              ; aliorum etiam demonſtrationes aliqua
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              ex parte vacillent, viſum eſt breuiter expeditam,
                <expan abbr="atq;">atque</expan>
              abſolutam
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              ipſius apponere demonſtrationem. </s>
              <s id="s.002156">Cum igitur in cœleſti arcu
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              duo potiſſimum ſint, quæ ſui admiratione
                <expan abbr="Philoſophorũ">Philoſophorum</expan>
              animos in ſui con­
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              templationem alliciant, colores, ſcilicet, & figura: nos mirabilem illam co­
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              lorum triadem, tanquam alienam, phyſicis relinquentes, de figura ipſius iu­
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              re mathematico diſſeremus: rotunditatis ſcilicet Iridis cauſam opticis ra­
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              tionibus venabimur, cur aliquando ſemicirculus, aliquando ſemicirculo mi­
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              nor appareat. </s>
              <s id="s.002157">vt igitur ordine procedamus.</s>
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              <s id="s.002158">Primo loco aduertendum eſt tria ad Iridis viſionem eſſe neceſſaria, So­
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              lem, oculum, & nubem tenuem, ac roſcidam, quæ ſcilicet minutis guttulis
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              iam ſcateat; hac enim ratione guttulæ illæ innumera erunt veluti parua
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              ſpecula, quæ lumen Solis ob paruitatem imperfecto quodam modo repre­
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              ſentare poſſint, ex tali enim repreſentatione Iris apparet. </s>
              <s id="s.002159">quæ tria debent
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              eſſe ita diſpoſita, vt Sol, oculus, & centrum Iridis ſint in eadem recta linea
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              conſtituta,
                <expan abbr="oculusq́">oculusque</expan>
              ; medium locum, inter Solem, & Iridis
                <expan abbr="cẽtrum">centrum</expan>
              obtineat,
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              vt in prima figura videre eſt, in qua Sol vbi A, oculus in C. nubes verò
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              G H L E, in qua apparet Iris in arcu E B F, quem debemus concipere eſſe
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              in receſſu, vt pictores aiunt, depictum. </s>
              <s id="s.002160">i. </s>
              <s id="s.002161">non in hoc ſitu, & ouali figura, ſed
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                <figure id="id.009.01.125.1.jpg" place="text" xlink:href="009/01/125/1.jpg" number="65"/>
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              eſſe perfectè ſemicircularem,
                <expan abbr="habereq́">habereque</expan>
              ; talem poſitionem, vt pars ipſius B F,
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              ſit citra chartam eleuata,
                <expan abbr="ipſiq́">ipſique</expan>
              ; perpendicularis, pars verò E B, vltra </s>
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