Word: filaments
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...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...
...Fink's tungsten plate will be less ubiquitous. Its chief value lies in its resistance to hydrochloric acid. Only gold is so resistant. But gold is too precious to coat the pots and pipes of Industry. Professor Fink, 51, claims to be the "originator of the drawn tungsten filament'' for lamps.* Another scientist given the kudos is General Electric's Dr. William David Coolidge, 59. In 1914 the American Academy of Arts & Sciences gave Dr. Coolidge its prized Rumford Medal for the ''invention and applications of ductile tungsten." Dr. Coolidge also was in last...
...Tungsten lamps use 1.25 watts to produce one candlepower of light. Carbon filament lamps, which are still purchasable, give one candlepower for 3.25 watts. From these ratios statisticians figure that tungsten filaments save U. S. users of electricity one billion dollars yearly. Consumers buy 300,000,000 tungsten lamps a year...
...method; practice, not theory. No dilettante, he plunged into a project with sleeves rolled, working almost without rest for days and nights together until he made the lamp filament glow, until he made the phonograph talk. "Genius is nine-tenths perspiration," he believed...