Word: filaments
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...working parts of the Harvard electron furnace are a small cylindrical metal cup, or crucible about one half inch in diameter and height; and two filament wires on opposite sides of the crucible...
...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...
...rough control over current, which electricians were able to exercise through changing the potentials on the positive and negative terminals of the original tubes, was rendered extremely sensitive and intricate with the addition, by Dr. Lee De Forest, of an independently charged grid of wire between the heated filament and the positively charged plate...
...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...