Word: phosphors
(lookup in dictionary)
(lookup stats)
Dates: during 1940-1949
Sort By: most recent first
(reverse)
...disc is properly synchronized with the 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...
...receiving set at the other end has three picture tubes. They are like black & white tubes except that each has on its face a phosphor that glows in a different basic color. Each little impulse (the colored freight cars) arriving over the beam is electronically switched to the properly colored tube. They arrive so fast that each tube-face is covered 15 times a second with a pattern of tiny dots corresponding to the blues, reds and greens in the scene being televised. The more red there is in a part of the scene (e.g., a red dress), the brighter...
...worth of smaller ones. The cutting, which follows more than a year of study and experimentation by experts, will take 15 months of sawing, cleaving (splitting) and polishing, will turn nearly 50% of the diamond's weight to dust. With a whirring, .0035-of-an-inch-thick, Phosphor Bronze cutting disk, swabbed with olive oil and diamond dust, Grasselly last week began cutting. It will take about three weeks to complete the first...