Word: lighting
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Dates: during 1940-1949
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...avoid incidents along the border between the British enclave and Red China, which runs along the main street of Sha-taokok village (see cut). But Communist influence daily makes itself felt in the colony. Through labor unions, the Communists already have a grip on Hong Kong's light & power, transportation, docks and its telephone system. A typical crisis arose last week when a young Chinese telephone worker claimed he had been slapped by a British supervisor. The worker's union threatened to strike unless the supervisor apologized and was fired. After five days' negotiations, the Briton apologized...
...technical embroidery, the basic theory of color television is fairly simple. Even a black & white television picture is an optical illusion. All there is on the screen at any instant is a fast-moving bright spot that "scans" back & forth, covering the whole screen with 525 lines of light which the slow-reacting human eye (if not brought too close) sees as a picture. The pictures follow one another so fast (30 a second) that they are blended by the eye to give the illusion of motion-just as the eye blends the frames on a strip of movie film...
...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 segment of the disc...
...scanning speed of the tube, one-color "fields" go out over the airwaves and appear one after the other on the face of the receiving "picture" tube. All of them are white, since the "phosphor" (the luminescent substance) on the tube's face glows only in white light. But in front of the receiving set's picture tube is a second spinning "color disc" (see diagram). This disc is synchronized so that a blue segment is between the tube and the eye of the viewer whenever a "blue" field is flashing on the tube. So the eye sees...
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...