Durham Medical Books > Optics > Download e-book for kindle: Alhacen's Theory of Visual Perception (First Three Books of by Alhazen, A. Mark Smith

Download e-book for kindle: Alhacen's Theory of Visual Perception (First Three Books of by Alhazen, A. Mark Smith

By Alhazen, A. Mark Smith

ISBN-10: 0871699141

ISBN-13: 9780871699145

Someday among 1028 and 1038, Ibn al-Haytham accomplished his huge optical synthesis, Kitab al-Manazir ("Book of Optics"). by means of no later than 1200, and maybe slightly prior, this treatise seemed in Latin less than the name De aspectibus. In that shape it was once attributed to a definite "Alhacen." those modifications in identify and authorial designation are indicative of the profound transformations among the 2 models, Arabic and Latin, of the treatise. in lots of methods, in truth, they are often seemed now not easily as varied models of an identical paintings, yet as varied works of their personal correct. hence, the Arab writer, Ibn al-Haytham, and his Latin incarnation, Alhacen, symbolize targeted, occasionally even conflicting, interpretive voices. And an analogous holds for his or her respective texts. To complicate concerns, "Alhacen" doesn't signify a unmarried interpretive voice. there have been not less than translators at paintings at the Latin textual content, considered one of them adhering faithfully to the Arabic unique, the opposite content material with distilling, even paraphrasing, the Arabic unique. accordingly, the Latin textual content provides no longer one, yet not less than faces to the reader. This two-volume serious version represents fourteen years of labor on Dr. Smith's half. offered the 2001 J. F. Lewis Award.

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Additional 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)

Example text

60-62 (see pp. 445-447below), both take time, albeit an imperceptiblyshort time, to traverse space. For another,both continually lose intensity as they radiate ever fartherfrom their source. For yet another,the intensity with which they illuminatephysicalbodies depends upon how directly they impinge upon those bodies: the more directthe impingement,the more intense the effect. '64 Under these conditions, the basic function of the eye is obvious enough: to be affectedby the forms of light and color that strike it.

85 To put it in Aristotelian terms, color, for Ptolemy, is the proper object of sight, the sole property of things that can be apprehended by the visual flux. 86 This color-impression is absolutely primal; from it everything else that is seen derives. Color thus constitutes the primary visible (primovidetur) in Ptolemy's account. 87 Color, in short, is immediately visible; all other qualities that are subject to visual perception are mediately visible. 88 Occupying the surfaces of bodies, moreover, color defines them for sight by providing the boundary-conditions under which they are visually grasped as discrete wholes.

For yet another,the intensity with which they illuminatephysicalbodies depends upon how directly they impinge upon those bodies: the more directthe impingement,the more intense the effect. '64 Under these conditions, the basic function of the eye is obvious enough: to be affectedby the forms of light and color that strike it. To Ivi ALHACEN'SDE ASPECTIBUS establish this point, Alhacen is at pains in the first five chaptersof book 1 in the Latintext to show by common experience how light and color affect sight in various ways depending upon ambient circumstances.

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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) by Alhazen, A. Mark Smith


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