perspective glass

1 definition found

perspective glass - Collaborative International Dictionary of English v.0.48 :

  Perspective \Per*spec"tive\, n. [F. perspective, fr. perspectif:
     cf. It. perspettiva. See Perspective, a.]
     1. A glass through which objects are viewed. [Obs.] "Not a
        perspective, but a mirror." --Sir T. Browne.
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     2. That which is seen through an opening; a view; a vista.
        "The perspective of life." --Goldsmith.
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     3. The effect of distance upon the appearance of objects, by
        means of which the eye recognizes them as being at a more
        or less measurable distance. Hence, a["e]rial perspective,
        the assumed greater vagueness or uncertainty of outline in
        distant objects.
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              A["e]rial perspective is the expression of space by
              any means whatsoever, sharpness of edge, vividness
              of color, etc.                        --Ruskin.
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     4. The art and the science of so delineating objects that
        they shall seem to grow smaller as they recede from the
        eye; -- called also linear perspective.
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     5. A drawing in linear perspective.
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     Isometrical perspective, an inaccurate term for a
        mechanical way of representing objects in the direction of
        the diagonal of a cube.
  
     Perspective glass, a telescope which shows objects in the
        right position.
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