Word: thermal
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Dates: during 1940-1949
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...called U-235.- This kind is scarce and extremely difficult to separate from the common isotope, 11-238. So far, not enough U-235 has been isolated to put in a fruit fly's eye. A Swedish scientist was beginning to speed up the process with gadgets called thermal diffusion tubes when the war stopped him. Another line of attack is with centrifuges - whirling machines which work like cream separators...
...next year. It was started by outside power, then fuel was injected. The engine blew up. Diesel was pleased. It had shown him that the heat of compression really was enough to ignite the fuel. Four more years of hard, steady work produced an engine with the highest thermal efficiency of any then in existence...
Last week, however, word came from Stockholm that a Swedish scientist had been building thermal diffusion tubes expected to speed up U-235 production 11,000 times, when he was stopped by the war raging around his beleaguered country. In the U. S. Gano Dunn, president...