Xerography (or electrophotography) is a photocopying technique developed by Chester Carlson in 1938 and patented on October 6, 1942. He received U.S. Patent 2,297,691 for his invention.
xerography
a copying process that utilizes a selenium surface and electrostatic faces to form an image.
x-height
the height of the lowercase letters of a type face that do not have ascenders or decenders.
Xerography
is a photographic process which uses an electrically charged metal plate. On exposure to light the electrical charge is destroyed, leaving a latent image in which shadows are represented by charged areas.
Xerography and Television. -
Other common phenomena, based on excitatory or inhibitory effects, show border effects reminiscent of the Sabatier border line.
 See also: Film, Color, Image, Light, Negative
  
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