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
<head xml:id="echoid-head482" xml:space="preserve" style="it">3. Radius medio denſiori perpendicularis, irrefract{us} penetrat. 42. p 2. Idem 17 n 1.</head>
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<s xml:id="echoid-s16606" xml:space="preserve">CVm ergo experimentator uoluerit experiri tranſitum luminis in aqua per hoc inſtrumen-
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tum:</s>
<s xml:id="echoid-s16607" xml:space="preserve"> accipiet uas rectarum orarum, ut cadum cupreum, aut ollam figulinam, aut conſimile:</s>
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& ſit altitudo orarum eius non minor medietate cubiti:</s>
<s xml:id="echoid-s16609" xml:space="preserve"> & ſit diameter circumferentię eius
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non minor diametro inſtrumenti:</s>
<s xml:id="echoid-s16610" xml:space="preserve"> & adæquentur orę eius, donec ſuperficies, quę tranſit per oras
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eius, ſit ſuperficies æqualis:</s>
<s xml:id="echoid-s16611" xml:space="preserve"> & ponamus in fundo eius corpus diuerſarum partium aut diuerſorum
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colorum, ut annulum, aut argentum depictum, aut depingatur in fundo eius pictura manifeſta:</s>