Word: orthicon
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With the television equipment in general use today, this sort of supervision is hardly practical. The "eye" of conventional television is an image orthicOn tube 14 inches long and 3 inches in diameter, usually mounted in a monstrous camera as big as a salesman's suitcase. The size and complication of the image orthicon would keep television from any use as a hidden, unwinking...
Color with Fields, In the CBS color system (called "field sequential"), the transmitting camera, like the ordinary black & white camera, has a single Image Orthicon "seeing" tube. In front of it is a spinning disc with segments of blue, green and red transparent plastic. When a blue segment is in front of the tube, the camera sees only the blue light coming from the scene being televised. When the disc has turned a little, putting a red segment in front of the tube, the camera sees only the scene's red light. Next, it sees green through a green...
...pretty girls on a stage being televised by old-style equipment under glaring lights. When some of the lights were switched out, the girls faded off the television screen set up in front of the audience. The old camera could not see them. Then R.C.A.'s new "image orthicon" pickup tube went into action, and the girls reappeared on the screen, brighter than ever...
...girls still smiled self-consciously from the screen. At last, in the flattering light of a single candle, the girls on the stage looked lovely but dim. Their televised images on the screen were as bright as if seen in a well-lit room. The image orthicon, 100 times as sensitive as earlier tubes, had actually amplified the light reflected from their faces...
...most startling-and corniest-stunt came last. With the studio in pitch darkness, the television screen showed a radio announcer making stagy passes at one of the girls. From a balcony, an infrared projector was shooting "black light" on the stage; the all-seeing image orthicon (sensitive to infra red) was spying on the couple...