light table

noun
a table that has a translucent top illuminated from below and is used typically for making tracings or examining color transparencies.
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World English Dictionary
light table
 
n
printing a translucent surface of ground glass or a similar substance, illuminated from below and used for the examination of positive or negative film, and for the make-up of photocomposed pages

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Geologic contacts are inked on mylar sheet placed on top of source map on light
  table.
Working over a light table, the scriber then uses engraving instruments to etch
  the map's lines and symbols.
These images can be viewed using a light table the operating lantern slide
  projector.
One parent brought in his own brain scan to show students on the light table.
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