Harold Urey, Ernest Lawrence, James B. Conant, Lyman Briggs, Eger Murphree, Arthur Compton Courtesy of Lawrence Berkeley National Laboratory
December 6, 1941
The Advisory Committee on Uranium, now called the S-1 section, meets to establish the first timetables for bomb production. The first large scale contracts for research into isotope separation are also let.

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The work of the next several months is divided between four groups headed by the following:
1. Harold Urey, Columbia
gaseous diffusion isotope separation
centrifuge isotope separation
heavy water investigations
2. Ernest Lawrence, Berkeley
electro-magnetic isotope separation
3. Arthur Compton, Chicago
chain reaction and weapon theory
4. Eger Murphree, Standard Oil
engineering aspects

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