Errors: 1. Expected price-tag off by over $1bn; 2. Date of delivery is 1.5 years off; 3. Critical mass for U-235 was 5-10X off.
75 years ago today: Vannevar Bush sends a memo to FDR, suggesting they ramp up their work on the atomic bomb. "VB, OK, FDR," he writes back.pic.twitter.com/9bfFFKhZ5s
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Illustrates important thing about early Manhattan Project: they really didn't realize it'd be so hard, so expensive. They got overcommitted.
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V.B.?
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Vannevar Bush
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It was reviewed by Henry Wallace (VP in 1942). Harry Truman wasn't aware of project when Roosevelt died.
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My dad was one of the first civilians without clearance to be told about the A-bomb. He was 7 in Oak Ridge, Army set up tents, showed film.
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