Cream separators are 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...
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