Word: abouts
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Dates: during 1940-1949
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When engineers let their imaginations go-in a properly professional manner-they are apt to think about rockets, whose limit is above the sky. Last week a Manhattan meeting of the American Society of Mechanical Engineers heard Professor Hsue-shen Tsien, Chinese-born rocket expert from Caltech, on the prospects...
Since the speed of the exhaust gases is proportionate to the temperature in the combustion chamber, Lewis next calculated what temperature such a rocket's materials would have to stand. The figure came out about 506,000° F., which is about 80 times more than enough to melt...
Uranium is a tricky element. As it comes from the mines, it contains only .7% of the active isotope U-235, whose atoms "fission" (split in two) with a big release of energy. Nearly all the rest is 11-238, an idle isotope which will not fission naturally, though its...
An exciting bit of atomic gossip was loudly whispered about last week through Washington's resonant corridors. Tipsters were insisting that U.S. scientists are working on "the hydrogen bomb." The rumors started when Colorado's Senator Edwin Johnson, member of the Joint Congressional Committee on Atomic Energy, told...
The full, round figure alerted Washington's amateur physicists. According to fairly dependable estimates, the Hiroshima bomb developed not more than 10% of the fission energy present in its nuclear explosive. Perfect efficiency (probably impossible) would therefore give about ten times as much power, certainly not 1,000 times...