Definitions for image orthicon
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Princeton's WordNet
orthicon, image orthicon(noun)
a now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons
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"image orthicon." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/image orthicon>.