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=Holography Glossary=
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'''Xenon''' - a rare gas sometimes used with electronic flash tubes and enclosed arc light sources. 

'''Xerography''' - 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. A powdered pigment dusted over the plate is attracted to the charged areas, producing a visible image. 

'''Xography''' - a system of photography which produces prints and transparencies with a three-dimensional effect. A cylindrically embossed lenticular screen is placed in contact with the film and a shutter behind the lens is arranged to scan the subject during exposure. 

'''X ray''' - electromagnetic radiations beyond ultraviolet which, when passed through a solid object and allowed to act upon a sensitive emulsion, form a shadow image of the internal structure of the object. 

'''X ray film''' - spectral sheet film for radiography, having a thick emulsion coated on both sides of the support to increase the absorption of X rays.