Ibn-al-Haitam, al-Hasan Ibn-al-Hasan; Witelo; Risner, Friedrich, Opticae thesavrvs Alhazeni Arabis libri septem, nunc primùm editi. Eivsdem liber De Crepvscvlis & Nubium ascensionibus. Item Vitellonis Thuvringopoloni Libri X. Omnes instaurati, figuris illustrati & aucti, adiectis etiam in Alhazenum commentarijs, a Federico Risnero, 1572

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        <div xml:id="echoid-div86" type="section" level="0" n="0">
          <p>
            <s xml:id="echoid-s2592" xml:space="preserve">
              <pb o="49" file="0055" n="55" rhead="OPTICAE LIBER II."/>
            figuram circumferentiæ rei uiſæ.</s>
            <s xml:id="echoid-s2593" xml:space="preserve"> Et ſimiliter figura circumferentiæ cuiuslibet partium ſuperficiei
              <lb/>
            rei uiſæ comprehenditur à ſentiente ex ſenſu ordinationis partium terminorum partis formæ.</s>
            <s xml:id="echoid-s2594" xml:space="preserve"> Et
              <lb/>
            cum ſentiens uoluerit certificare figuram circumferentiæ ſuperficiei rei uiſæ, aut figuram circum-
              <lb/>
            ferentiæ partis rei uiſæ, mouebit axem radialem ſuper circumferentiam rei uiſæ:</s>
            <s xml:id="echoid-s2595" xml:space="preserve"> & ſic per motum
              <lb/>
            certificabit ſitum partium terminorum formæ ſuperficiei, quæ eſt in ſuperficie membri ſentientis,
              <lb/>
            & in concauo nerui communis.</s>
            <s xml:id="echoid-s2596" xml:space="preserve"> Quare comprehendet ex certificatione ſituum terminorum for-
              <lb/>
            mæ, figuram circumferentiæ ſuperficiei rei uiſæ.</s>
            <s xml:id="echoid-s2597" xml:space="preserve"> Secundum ergo hunc modum erit comprehen-
              <lb/>
            ſio figuræ circumferentiæ rei uiſæ, & figuræ circumferentiæ cuiuslibet partis ſuperficiei rei uiſæ
              <lb/>
            per ſenſum uiſus.</s>
            <s xml:id="echoid-s2598" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div87" type="section" level="0" n="0">
          <head xml:id="echoid-head111" xml:space="preserve" style="it">33. Superficies globoſa percipitur è propinquitate partium mediarum, & æquabi-
            <lb/>
          li longinquitate extremarum. 48 p 4.</head>
          <p>
            <s xml:id="echoid-s2599" xml:space="preserve">FOrma autem ſuperficiei rei uiſæ non comprehenditur à uiſu, niſi ex comprehenſione ſituum
              <lb/>
            partium ſuperficiei rei uiſæ, & ex conſimilitudine & diſsimilitudine eorundem ſituum.</s>
            <s xml:id="echoid-s2600" xml:space="preserve"> Et
              <lb/>
            certificatur forma ſuperficiei ex comprehenſione diuerſitatis inæqualitatis remotionum par-
              <lb/>
            tium ſuperficiei rei uiſę, & æqualitatis earum, aut inæqualitatis eleuationum partium ſuperficiei
              <lb/>
            & æqualitatis earum.</s>
            <s xml:id="echoid-s2601" xml:space="preserve"> Quoniam conuexitas ſuperficiei non comprehenditur à uiſu, niſi aut ex
              <lb/>
            comprehenſione propinquitatis partium mediarum in ſuperficie, & remotionis partium in termi-
              <lb/>
            nis:</s>
            <s xml:id="echoid-s2602" xml:space="preserve"> aut ex inęqualitate eleuationum partium eius, quando ſuperficies ſuperior corporis fuerit cõ-
              <lb/>
            uexa.</s>
            <s xml:id="echoid-s2603" xml:space="preserve"> Et ſimiliter conuexitas termini ſuperficiei non comprehenditur à uiſu, niſi aut ex compre-
              <lb/>
            henſione propinquitatis medij, & remotionis extremitatum, quando conuexitas eius opponitur
              <lb/>
            uiſui:</s>
            <s xml:id="echoid-s2604" xml:space="preserve"> aut ex inęqualitate eleuationum partium eius, quãdo gibboſitas eius fuerit deorſum, aut ſur-
              <lb/>
            ſum:</s>
            <s xml:id="echoid-s2605" xml:space="preserve"> aut ex inęqualitate partium eius, quod in eo dextrum eſt, aut ſiniſtrum, quando gibboſitas e-
              <lb/>
            ius fuerit dextra aut ſiniſtra.</s>
            <s xml:id="echoid-s2606" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div88" type="section" level="0" n="0">
          <head xml:id="echoid-head112" xml:space="preserve" style="it">34. Superficies caua percipit ur è longinquit ate partium mediarum, & æquabilipro-
            <lb/>
          pinquitate extremarum. 49 p 4.</head>
          <p>
            <s xml:id="echoid-s2607" xml:space="preserve">COncauitas autem ſuperficiei, quando opponitur uiſui, comprehenditur à uiſu ex compre-
              <lb/>
            henſione remotionis partium mediarum, & appropinquatione extremitatum terminorum.</s>
            <s xml:id="echoid-s2608" xml:space="preserve">
              <lb/>
            Similiter eſt de concauitate terminorum ſuperficiei, quando opponitur uiſui:</s>
            <s xml:id="echoid-s2609" xml:space="preserve"> & uiſus non
              <lb/>
            comprehendit concauitatem ſuperficiei, quando concauitas fuerit oppoſita ſurſum, aut deorſum,
              <lb/>
            aut ad latus, niſi quando ſuperficies concaua fuerit in parte abſciſſa, & apparuerit arcualitas termi-
              <lb/>
            ni eius, quę eſt uerſus uiſum.</s>
            <s xml:id="echoid-s2610" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div89" type="section" level="0" n="0">
          <head xml:id="echoid-head113" xml:space="preserve" style="it">35. Planities in diſtantia moderata directè oppoſita uiſui: percipitur ex æquabili
            <lb/>
          partium longinquitate, & ſimilitudine collocationis atque ordinis ipſarum inter i-
            <lb/>
          pſas. 47 p 4.</head>
          <p>
            <s xml:id="echoid-s2611" xml:space="preserve">PLanities autem ſuperficierum comprehenditur à uiſu ex comprehenſione æqualitatis remo-
              <lb/>
            tionum partium & conſimilitudinis ordinationis earum.</s>
            <s xml:id="echoid-s2612" xml:space="preserve"> Et ſimiliter comprehenditur recti-
              <lb/>
            tudo termini ſuperficiei, quando terminus opponetur uiſui.</s>
            <s xml:id="echoid-s2613" xml:space="preserve"> Rectitudo enim termini ſuper-
              <lb/>
            ficiei, & arcualitas, aut curuitas eius, quando ſuperficies fuerit oppoſita uiſui, & termini continue-
              <lb/>
            rint ipſam, comprehenditur à uiſu ex ordinatione partium eius inter ſe.</s>
            <s xml:id="echoid-s2614" xml:space="preserve"> Conuexitas ergo ſuperfi-
              <lb/>
            ciei rei uiſæ, quæ opponitur uiſui, & concauitas eius, & planities comprehenduntur à uiſu ex com
              <lb/>
            prehenſione diuerſitatis remotionis partium ſuperficiei, aut eleuationum earum, aut latitudinum
              <lb/>
            earum, & ex quantitatibus exceſſus remotionis partium, aut eleuationum, aut latitudinum ea-
              <lb/>
            rum interſe.</s>
            <s xml:id="echoid-s2615" xml:space="preserve"> Et ſimiliter conuexitas, & concauitas, & planities cuiuslibet partis rei uiſæ compre-
              <lb/>
            henditur à uiſu ex comprehenſione exceſſus remotionum partium illius partis, aut exceſſus eleua-
              <lb/>
            tionum, aut latitudinum earum, aut æqualitatis earum.</s>
            <s xml:id="echoid-s2616" xml:space="preserve"> Et propter iſtam cauſſam non comprehen
              <lb/>
            dit uiſus concauitatem & conuexitatem, niſi in uiſibilibus, quorum remotio eſt mediocris.</s>
            <s xml:id="echoid-s2617" xml:space="preserve"> Vi-
              <lb/>
            ſus autem comprehendit propinquitatem quarundam partium ſuperficiei, & remotionem qua-
              <lb/>
            rundam per quædam corpora interuenientia inter ipſum, & ſuperficiem, & per corpora reſpicien-
              <lb/>
            tia remotiones partium, quarum appropinquatio & remotio certificatur à uiſu.</s>
            <s xml:id="echoid-s2618" xml:space="preserve"> Et cum quædam
              <lb/>
            partes ſuperficiei fuerint prominentes, & quædam profundæ:</s>
            <s xml:id="echoid-s2619" xml:space="preserve"> comprehendet uiſus prominen-
              <lb/>
            tiam & profunditatem illarum per obliquationem ſuperficierum partium, & ſectiones partium, &
              <lb/>
            curuitates earum in locis profunditatis, & per ſitus ſuperficierum partium inter ſe.</s>
            <s xml:id="echoid-s2620" xml:space="preserve"> Et hoc erit,
              <lb/>
            quando uiſus non comprehenderit illam ſuperficiem antè, neque aliquam huius generis.</s>
            <s xml:id="echoid-s2621" xml:space="preserve"> Si autem
              <lb/>
            illa res uiſa fuerit ex uiſibilibus aſſuetis, comprehendet uiſus formam eius, & formam ſuperſiciei
              <lb/>
            per cognitionem antecedentem.</s>
            <s xml:id="echoid-s2622" xml:space="preserve"> Forma a
              <gap/>
            tem rei uiſæ, quæ continetur ex ſuperficiebus ſecanti-
              <lb/>
            bus ſe, & diuerſorum ſituum, comprehenditur à uiſu ex comprehenſione ſectionis ſuperficiei e-
              <lb/>
            ius, & ex comprehenſione ſitus cuiuslibet ſuperficierum eius, & ex comprehenſione ſuperficie-
              <lb/>
            rum earum inter ſe.</s>
            <s xml:id="echoid-s2623" xml:space="preserve"> Formæ igitur figurarum rerum uiſarum, quarum corporeitas comprehendi-
              <lb/>
            tur à uiſu, comprehenduntur ex comprehenſione formarum ſuperficierum earum, & ex compre-
              <lb/>
            </s>
          </p>
        </div>
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    </echo>
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