Word: molecular
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Dates: during 1920-1929
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...invention, the "window." This constituted a vast improvement upon the aluminum disc of earlier experiments. It was a sheet of nickel 1/2000 of an inch thin and three inches in diameter, supported against the 100-pound suction of the vacuum tube by skeleton struts of molybdenum. The molecular structure of nickel is such that molecules of air (oxygen, nitrogen) cannot pass through it, though it offers a minimum of resistance to those billionth parts of molecules, electrons...
...cathode, they raced off down the 12-inch exit passage of the tube until, when they reached the "window," they were going some 150,000 m.p.s. (four-fifths the speed of light). Their volume was virtually undiminished as they shot through the thin nickel foil and out into heavy, molecular air, where their effects were at once visible and startling...
Hottest Flame. Dr. Irving Langmuir of the General Electric Company described his discovery of a flame hotter than hydrogen burning in oxygen (oxy-hydrogen). He made atomic hydrogen burn in an atmosphere of molecular hydrogen. His hydrogen blowtorch melted tungsten wire like an icicle, indicating that its heat was at least 7,000° F. Playing on a sheet of chrome steel the flame left molten pools behind it. Significance: steel girders could be welded silently instead of noisily riveted;* the welds would not (as when an oxyhydrogen flame is used) be oxidized and thus weakened, they would be annealing...
Last week, Professor Karl T. Compton reported that he had put molecular hydrogen into a tungsten tube, heated it to 2,800 degrees Centigrade, thereby dissociating it into atomic hydrogen, and shot into this a current of electrons from a hot filament similar to those used in a radio tube. The energy of this current was readily reckoned in volts, and as the voltage was increased things began to happen to the hydrogen atoms it encountered. Suddenly they began to emit radiation of a definite wavelength, measurable as a single line in a light spectrum. The hydrogen atoms had been...
...fear expressed for the future is that some terrifically powerful gas will be invented which will paralyze cities, slay armies, but this is extremely improbable. Gases are divided into two classes: Those having heavy molecular weight; those whose molecules are light?the most volatile. The first, usually? vapors, can be absorbed by charcoal independently of their chemical composition; of the second, only a small proportion are poisonous and these are all known and can be guarded against. Irritant smokes present a different problem and may be invented in deadlier forms than are at present known but, as they are invented...