By Alhazen, A. Mark Smith
Someday among 1028 and 1038, Ibn al-Haytham accomplished his huge optical synthesis, Kitab al-Manazir ("Book of Optics"). via no later than 1200, and maybe just a little previous, this treatise seemed in Latin lower than the identify De aspectibus. In that shape it was once attributed to a undeniable "Alhacen." those ameliorations in name and authorial designation are indicative of the profound transformations among the 2 types, Arabic and Latin, of the treatise. in lots of methods, in truth, they are often seemed no longer easily as diversified types of an identical paintings, yet as varied works of their personal correct. therefore, the Arab writer, Ibn al-Haytham, and his Latin incarnation, Alhacen, symbolize targeted, occasionally even conflicting, interpretive voices. And a similar holds for his or her respective texts. To complicate concerns, "Alhacen" doesn't symbolize a unmarried interpretive voice. there have been not less than translators at paintings at the Latin textual content, one in all them adhering faithfully to the Arabic unique, the opposite content material with distilling, even paraphrasing, the Arabic unique. as a result, the Latin textual content provides now not one, yet at the very least faces to the reader. This two-volume severe variation represents fourteen years of labor on Dr. Smith's half. offered the 2001 J. F. Lewis Award.
Read or Download Alhacen's Theory of Visual Perception (First Three Books of Alhacen's De Aspectibus), Volume One - Introduction and Latin Text (Transactions of the American Philosophical Society) PDF
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Extra info for Alhacen's Theory of Visual Perception (First Three Books of Alhacen's De Aspectibus), Volume One - Introduction and Latin Text (Transactions of the American Philosophical Society)
The eye, for its part,has the potential to see, but that potential remains unrealized until the eye is properly affected by the illuminatedcolor-formsthatstrikeits surface.
Galen is far from uncritical in his use of these sources, though. 124 Ptolemy, as well, draws upon many of the same sources, although, unlike Galen, he does not mention them by name. 125 It not unlikely, for example, that Ptolemy fol- xliv ALHACEN'SDE ASPECTIBUS lowed the Stoiclead in his conceptionof visual flux, understandingit as a pneumaticstreamoriginatingin the soul and passing throughthe eye to the outside air. ,Aristotle,the Stoics,Plato,Euclid),but also a variety of ostensibly disparate disciplines (i.
In the case of diplopia, for instance, the apparatusconsists of a small board upon which colored pegs and sighting lines can be placed at various locationsto producemultiple imaging. Reflectionis analyzed inductively through the use of a circularmeasuring plaque to which a sighting-deviceis attachedand upon which plane, concave, and convex mirrorsare attachedfor examination. 99 As the culminatingstep in the evolution of ancientvisual-raytheory, Ptolemy's Opticsreflects a number of ideas and concerns that bear directly upon Ibn al-Haytham'slater analysis of light and sight.