One of the mysteries of the English language finally explained.
1Photography (in a camera or scientific instrument) a tube along which light is directed from a lens or source into a device holding the film or plate (now chiefly historical).
2Television any of various types of cathode ray tube used in television cameras to convert an optical image into a corresponding electrical signal; also called pick-up tube.
Mid 19th century; earliest use found in U.S. Patents.
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