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1. n. 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 Source: wordnet
2. n. 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 Source: ecdict

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electrons camera causing emission emitted focused incident intensity light now obsolete onto photoemissive pickup picture proportion secondary surface target television tube

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