Word: filaments
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Dates: during 1930-1939
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...underlying principle of the vacuum tube, first detected by Edison during his experiments with electric light a half century ago, is that when two wires, one positively charged, and the other negatively, are inserted into a vacuum, and the negative wire or filament is heated, a current passes from the filament through the void to the positive terminal...
...solar system's origin which is probably more widely accepted among astronomers than any other. In this view, some 2,000,000,000 years ago, a wandering star happened to swing close to the sun, from which by its gravitational pull it drew out a long filament of hot matter which subsequently broke up and condensed to form the planets. The energy of motion which enabled the planets to assume orbits of revolution around the sun originated in the sidewise pull of the wandering star on the parent filament...
...cathode amplifier which he believed would be immensely useful to radio in general, to television in particular. Mr. Farnsworth, who despite his flair for electronics has learned to talk like a tycoon, calls his new tube the multipactor. Ordinary thermionic tubes generate electrons by boiling them from a hot filament. The multipactor takes advantage of the fact that certain metals hold electrons in suspension on their surfaces in such a way that impacts from outside electrons release them. When the current in the multipactor is turned on, random electrons are driven against the cold sides of the tube, loosing more...
...pitchblende. One ton of that mother ore was reduced to extract a half gram of protoactinium oxide. In a phosgene chlorinating bath this was transposed to a chloride. Using the method evolved by General Electric's famed Irving Langmuir. Dr. von Grosse spread the chloride on a tungsten filament in a vacuum, heated the filament, boiled off the chlorine, obtained his bit of pure protoactinium...
...bulb itself has four terminals, two for the filament, and is filled with neon gas and metallic sodium. When the current is switched on, an arc light springs from the filament, takes on a red glow from the neon gas, then a yellow glow from the evaporation of the filament. The bulb consumes 80 watts of electricity, but because it produces so much more light than the ordinary lamp of that wattage, its sponsors claim that it is not only more efficient but, once installed, is more economical. Chief problems have been that sodium attacks ordinary glass and that...