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Sight; An Exposition of the Principles of Monocular and Binocular Vision

Sight; An Exposition of the Principles of Monocular and Binocular Vision


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1881 Excerpt: ...122, forming a V, an inverted V, or an X, according to the distance of the point of sight; or, in other words, behave exactly like the two images of a rod held in the median plane with one end nearer than the other. In a single word, the phenomena are exactly those produced by looking at an actual skeleton cone made of wires. Thus, as in the case of an actual object, the eyes by greater and less convergence run their point of sight back and forth, uniting different parts, and thus acquire a distinct perception of depth of space between the smaller and larger circles. In a subsequent chapter we give the method of determining with accuracy the interocular distance. The same is true of all pictures constructed on this principle, and all objects or scenes on stereoscopic cards. In these, it will be remembered, identical points in the foreground are always nearer together than identical-joints in the background; therefore, when the back ground is united the foreground is double, and vice versa. We may represent these facts diagrammatically by Fig. 46, in which p p is the plane of the pictures; 'ms, the median screen resting on the root of the nose, n; R and Z, the right and left eyes. On the plane of the paper p p, a and a' represent identical points in the foreground, viz., the centers of the small circles in the diagram Fig. 45; and b and b ' identical points in the background (centers of the larger circles in Fig. 45). Now when the eyes are directed toward b and b', the two visual lines will pass through these points, and the images of these two points will fall on corresponding points of the retinae, viz., on the central spots, and will be united and seen single. But where? Manifestly at the point of optic convergence or point of sight B. Now when b and V fa...


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Product Details
  • ISBN-13: 9781231029015
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 64
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1231029013
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 132 gr

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