Word: dichroic
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...novel expedient of changing horses in the stretch, Radio Corp. of America made a surprise spurt in the color television sweepstakes.* Abandoning the "dichroic mirror" cathode tube which it had used through the past 3½ months of demonstrations before the Federal Communications Commission, RCA last week unveiled a new, all-electronic, direct-view color tube to some 60 newsmen at an NBC studio in Washington...
Color with Dots. RCA's system, called "dot interlacing," is entirely electronic, needs no spinning disc. In the transmitting camera are three tubes. In front of them is a system of "dichroic mirrors" (see below) which allow each tube to "see" in one color only. All three tubes scan the scene continuously, but an electronic switching device, turning their signals on & off 11.4 million times a second, allows each tube to transmit over the telecasting station only one-third of the time. In this way the "video signals" from all three tubes are strung together like trains made...
Next step is to combine the three colored images in the eye of the viewer. The combining is done with two "dichroic mirrors": plates of glass with one surface covered with a thin layer of a colorless, transparent substance. Because of the special way in which this combination affects light of different wave lengths, each mirror reflects only one color. The other two colors pass right through...
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