Word: rotors
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Dates: during 1930-1939
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...join these terrific speeds and pressures, Scientist Svedberg enclosed his rotor so that it spins in hydrogen reduced to 1/30 atmospheric pressure. Driving mechanism consists essentially of two turbines, the size of thread spools, against which oil is pumped at 800 lb. per sq. in. pressure. To prevent overheating of bearings, 45 minutes are required to work the rotor up to operating speed, 45 minutes more to slow it down. The rotor is oval in shape because an oval is less likely to fly apart than a circle...
...centrifuges. To bacteriologists who use more delicate centrifuges to whirl germs out of solutions, the name Svedberg is as familiar as the name De Laval is to dairymen. Lately at Sweden's University of Upsala, shy, black-eyed, Nobel Prizewinner Dr. Theodor Svedberg, 50, perfected two new rotors in which at normal operating speed a dime would press against the wall with a force of half a ton. One rotor he kept. The other he sent to the du Pont research laboratories at Wilmington, Del. There last week Dr. Elmer Otto Kraemer put the machine through its paces...
...Earth at the Equator. Particles whirled at that rate are subjected to a force 250,000 times that of gravity. In short spurts the centrifuge can rotate up to 160,000 r.p.m., exaggerating gravity 1,100,000 times. If this speed were maintained more than a few seconds the rotor would fly into smithereens. To prevent injury or death in case of such a mishap the 20-lb. rotor is girt by an 800-lb. steel shell, 5 in. thick...
...centrifuge developed by Professor Jesse Wakefield Beams of the University of Virginia with the turbine operated by compressed air, the rotor turning in a vacuum. Rim speeds of 2,000 ft. per sec. and centrifugal forces 900,000 times gravity have been attained...
Captions explained the pictures. The man was a Pilot Erich Kocher. He flew by lung-power, utilizing the rotor principle. Strapped to his chest was an assembly of two horizontal rotors. He had skiis on his feet for landing gear, and a finlike tail attached to his stern. By blowing into a box on his chest, Pilot Kocher made the rotors revolve. The turning rotors created a suction ahead, into which Pilot Kocher & apparatus sailed gaily, while his excited friends trotted after him. The august New York Times, proud of its minute coverage of aviation, printed the picture...