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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          <p>
            <s xml:id="echoid-s4077" xml:space="preserve">
              <pb o="78" file="0084" n="84" rhead="ALHAZEN"/>
            tuetur in duobus locis duorum uiſuum, inter quorum poſitiones non erit differentia ſenſibilis.</s>
            <s xml:id="echoid-s4078" xml:space="preserve">
              <lb/>
              <figure xlink:label="fig-0084-01" xlink:href="fig-0084-01a" number="15">
                <variables xml:id="echoid-variables8" xml:space="preserve">n m a b k c e d f g p h q ſ r o</variables>
              </figure>
            Forma autem uiſi remoti à uiſo, in quo duo axes coniungun-
              <lb/>
            tur, quando ambo uiſus comprehendunt illud uiſum, dum duo
              <lb/>
            axes ſunt fixi in illo uiſo:</s>
            <s xml:id="echoid-s4079" xml:space="preserve"> inſtituetur in duobus locis duorũ ui-
              <lb/>
            ſuum conſimilis poſitionis in parte tantùm, & non inremotio-
              <lb/>
            ne:</s>
            <s xml:id="echoid-s4080" xml:space="preserve"> aut non omnes partes eorum erunt conſimilis poſitionis
              <lb/>
            in remotione à duobus axibus:</s>
            <s xml:id="echoid-s4081" xml:space="preserve"> nec forma erit certificata.</s>
            <s xml:id="echoid-s4082" xml:space="preserve"> Dein-
              <lb/>
            de ſi duo uiſus fuerint moti, & duo axes:</s>
            <s xml:id="echoid-s4083" xml:space="preserve"> & fuerint coniuncti in
              <lb/>
            unoquoq;</s>
            <s xml:id="echoid-s4084" xml:space="preserve"> uiſibilium comprehenſorũ ſimul:</s>
            <s xml:id="echoid-s4085" xml:space="preserve"> tunc forma utriuſq;</s>
            <s xml:id="echoid-s4086" xml:space="preserve">
              <lb/>
            eorum inſtituetur in duobus locis cõſimilis poſitionis in reſpe-
              <lb/>
            ctu duorum uiſuum in parte & in remotione:</s>
            <s xml:id="echoid-s4087" xml:space="preserve"> & tunc certificabi-
              <lb/>
            tur forma uniuſcuiuſq;</s>
            <s xml:id="echoid-s4088" xml:space="preserve"> illorum uiſibilium.</s>
            <s xml:id="echoid-s4089" xml:space="preserve"> Et multoties coniun-
              <lb/>
            guntur duo axes amborũ uiſuum in aliquo uiſo:</s>
            <s xml:id="echoid-s4090" xml:space="preserve"> & cum hoc duo
              <lb/>
            uiſus comprehẽdent aliam rem uiſam, cuius poſitio in reſpectu
              <lb/>
            amborum uiſuum erit diuerſa in parte.</s>
            <s xml:id="echoid-s4091" xml:space="preserve"> Et hoc erit, quando illud
              <lb/>
            aliud uiſum fuerit propin quius ambobus uiſibus uiſo, in quo di
              <lb/>
            ſtinguuntur duo axes:</s>
            <s xml:id="echoid-s4092" xml:space="preserve"> & fuerit ſimul inter duos axes:</s>
            <s xml:id="echoid-s4093" xml:space="preserve"> aut fuerit
              <lb/>
            remotius ab ambobus uiſibus uiſo, in quo coniunguntur duo
              <lb/>
            axes, & fuerit etia inter duos axes, cũ fuerimus imaginati eos ex
              <lb/>
            tenſospoſt cõiunctionẽ:</s>
            <s xml:id="echoid-s4094" xml:space="preserve"> & uiſum, in quo cõiungũtur duo axes,
              <lb/>
            nõ cooperiet uiſum, qđ eſt remotius ipſo, aut cooperiet quiddã
              <lb/>
            illius.</s>
            <s xml:id="echoid-s4095" xml:space="preserve"> His ergo modιs fit cõprehenſio uiſibiliũ ambobus uiſibus.</s>
            <s xml:id="echoid-s4096" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div142" type="section" level="0" n="0">
          <head xml:id="echoid-head168" xml:space="preserve" style="it">6. Si duæ rectæ lineæ à medio nerui cõmunis ſint contermi-
            <lb/>
          nærectæ cõnectenti centra for aminum gyrineruorum cauo-
            <lb/>
          rum: conſtituent triangulum æquicrurum. 30 p 3.</head>
          <p>
            <s xml:id="echoid-s4097" xml:space="preserve">ET etiam declaratum eſt in ſecundo tractatu [1.</s>
            <s xml:id="echoid-s4098" xml:space="preserve">42 n] quòd
              <lb/>
            axis radialis in utroq;</s>
            <s xml:id="echoid-s4099" xml:space="preserve"> uiſu eſt eadẽ linea, quę nõ tranſmu-
              <lb/>
            tatur:</s>
            <s xml:id="echoid-s4100" xml:space="preserve"> & quòd pertranſit centra omniũ tunicarum uiſus, &
              <lb/>
            extenditur rectè per centra omniũ tunicarum ad mediũ loci in
              <lb/>
            curuationis ex cõcauo nerui, ſuper quem cõponitur oculus, qui eſt apud foramen, quod eſt in con-
              <lb/>
            cauo oſsis:</s>
            <s xml:id="echoid-s4101" xml:space="preserve"> & quòd eſt inſeparabilis ab omnibus cẽtris:</s>
            <s xml:id="echoid-s4102" xml:space="preserve"> & quòd poſitio eius apud omnes partes ui-
              <lb/>
              <figure xlink:label="fig-0084-02" xlink:href="fig-0084-02a" number="16">
                <variables xml:id="echoid-variables9" xml:space="preserve">a r t</variables>
              </figure>
            ſus, eſt poſitio ſemper eadẽ, nõ tranſmutabilis apud
              <lb/>
            motũ uiſus, nec apud quietem eius:</s>
            <s xml:id="echoid-s4103" xml:space="preserve"> & quòd poſitio
              <lb/>
            duorũ axium apud duos uiſus eſt poſit
              <unsure/>
            io conſimilis
              <lb/>
            in reſpectu amborũ uiſuum, apud cõcauitatem ner-
              <lb/>
            ui cõmunis, ex quo ultimum ſentiens comprehẽdit
              <lb/>
            formas uiſibilium.</s>
            <s xml:id="echoid-s4104" xml:space="preserve"> Imaginemur ergo lineam rectam
              <lb/>
            copulãtem duo centra duorũ foraminum, quæ ſunt
              <lb/>
            in duabus concauitatibus duorum oſsium cõtinen-
              <lb/>
            tiũ duos oculos:</s>
            <s xml:id="echoid-s4105" xml:space="preserve"> & imaginemur duas lineas exeun-
              <lb/>
            tes à duobus centris duorũ foraminum, extenſas in
              <lb/>
            duobus medijs duarũ concauitatum neruorum.</s>
            <s xml:id="echoid-s4106" xml:space="preserve"> Hæ
              <lb/>
            ergo lineæ cõiunguntur in medio concauitatis ner-
              <lb/>
            uι communis:</s>
            <s xml:id="echoid-s4107" xml:space="preserve"> quia poſitio duorum neruorum in re-
              <lb/>
            ſpectu communis nerui, eſt poſitio cõſimilis [per 4
              <lb/>
            n 1] & poſitio duarum harum linearum apud lineam
              <lb/>
            copulãtem duo centra duorum foraminum, erit po-
              <lb/>
            ſitio conſimilis:</s>
            <s xml:id="echoid-s4108" xml:space="preserve"> quia duorum neruorum poſitiones,
              <lb/>
            in reſpectu duorum foraminum, eſt poſitio cõſimi-
              <lb/>
            lis [per 4 n 1] & ſic duo anguli, qui ſunt inter has duas lineas & lineam copulatem duo centra duo-
              <lb/>
            rum foraminum, erunt æquales [ſecus diſsimilis eſſet poſitio neruorum.</s>
            <s xml:id="echoid-s4109" xml:space="preserve">]</s>
          </p>
        </div>
        <div xml:id="echoid-div144" type="section" level="0" n="0">
          <head xml:id="echoid-head169" xml:space="preserve" style="it">7. Si recta linea ſit à medio nerui communis admedium rectæ lineæ connectentis centra fo-
            <lb/>
          raminum gyrineruorum cauorum: erit ad ipſam perpendicularis. 33 p 3.</head>
          <p>
            <s xml:id="echoid-s4110" xml:space="preserve">ET imaginemur etiã lineã copulantem duo cẽtra duorũ foraminũ, diuiſam in duo æqualia:</s>
            <s xml:id="echoid-s4111" xml:space="preserve"> &
              <lb/>
            imaginemur lineã exeuntẽ à puncto, qđ eſt in medio cõcauitatis nerui cõmunis, in quo duæ
              <lb/>
            lineæ extenſæ in cõcauitatibus duorũ neruorũ ſunt cõiunctæ, extẽſam ad punctũ diuidẽs li-
              <lb/>
            neã copulantẽ duo cẽtra duorũ foraminã in duo æqualia.</s>
            <s xml:id="echoid-s4112" xml:space="preserve"> Hęcigitur linea erit perpẽdicularis ſuper
              <lb/>
            lineã copulantẽ duo cẽtra duorũ foraminũ [Nã recta cõnectens cẽtra duorũ foraminũ, fit baſis tri-
              <lb/>
            anguli æquicruri, cuius latera, ſunt rectæ à medio nerui cõmunis:</s>
            <s xml:id="echoid-s4113" xml:space="preserve"> itaq;</s>
            <s xml:id="echoid-s4114" xml:space="preserve"> ſi recta ſit à uertice in mediũ
              <lb/>
            baſis, erit քpẽdicularis ad baſim, ք 8 p.</s>
            <s xml:id="echoid-s4115" xml:space="preserve"> 10 d 1.</s>
            <s xml:id="echoid-s4116" xml:space="preserve">] Et imaginemur iſtã քpẽdicularẽ extẽſam rectè in par-
              <lb/>
            tẽ oppoſitã uiſui:</s>
            <s xml:id="echoid-s4117" xml:space="preserve"> & ſic iſta linea erit fixa in eodẽ ſtatu, & poſitio ei
              <emph style="sub">9</emph>
            nõ trãſmutabitur:</s>
            <s xml:id="echoid-s4118" xml:space="preserve"> ꝗa pũctũ, qđ
              <lb/>
            eſt in medio cõcauitatis nerui cõmunis, in quo duę lineæ extẽſæ in duob.</s>
            <s xml:id="echoid-s4119" xml:space="preserve"> medιjs concauitatũ duo-
              <lb/>
            rũ neruorũ ſunt cõiunctæ, eſt unũ nõ tranſmutabile:</s>
            <s xml:id="echoid-s4120" xml:space="preserve"> & punctũ etiã, qđ diuidit lineã copulantẽ duo
              <lb/>
            </s>
          </p>
        </div>
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    </echo>
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