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Wonderfnl peacetime "gnn" shoots ektrons
How a pencil-thin electron stream "paints" television pictures on TV screens
No. 7 in a series outlining high points in television history
Photos from the historical collection oj RCA
• Though television now is famihar to milHons, few know what actually makes pictures on the screens of home receivers. And there's little wonder why! This subject, to most laymen, is a highly complex concept.
Naturally, many factors are involved, but in home receivers the kinescope tube— developed by Dr. V. K. Zworykin of RCA Laboratories — is undoubtedly most important. The face of this tube is the receiver's "screen." On it, an amazing electron gun paints pictures in motion.
Inserted inside the kinescope— in a vacuum 10 times more perfect than that in any standard radio tube— this electron gun is machined and assembled with watchmaker precision ... to 1/lOOOth of an incb. Such care is necessary to assure that the electron stream, emitted by an electrically heated surface, is under perfect control— compressed into a tiny beam, in perfect
Electron gun which generates the pencil-like electron beam or "brush ; and paints the television picture in black-and-white on the kinescop luminescent face. '
After this white-hot block of luminescent material is taken from tl furnace, it will be spread on the face of a kinescope to form the screen fi | television pictures.
synchronization with the electron beam of a television camei in a distant station.
In obedience to a signal originating in the camera controls then telecast and received in your home— this electron beai moves across the luminescent screen of the kinescope . . . t paint areas of light and shade. In turn, your eye "combines these areas, and sees a picture!
One of the miracles of all this is that, although the electro beam moves across the face of the kinescope 525 times in thirtieth of a second— not a single mechanical moving part ^ involved! Thus there is no chance, in a kinescope, of an mechanical failm^e. i
Radio Corporation of Americt
WORLD LEADER IN RADIO-FIRST IN TELEYISIO