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light valve
noun
, Electricity.
- a light-transmitting device having transmissions that vary in accordance with an electric input, as voltage, current, or an electron beam, used chiefly for recording sound on motion-picture film.
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Word History and Origins
Origin of light valve1
First recorded in 1925–30
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Example Sentences
It will be noticed that a light valve-spring is shown in drawing.
From Project Gutenberg
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