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Atomic Bomb Beginning of Paper On August 2, 1939 Albert Einstein wrote to President Franklin D. Roosevelt. This was right before the start of World War 2. In this letter Einstein and several other scientists told Roosevelt of the efforts Hitler was making to purify U-235 in which he hoped to make an . This is w .... Middle of Paper .... is non-fissionable. Finding a process to refining the Uranium was the first step in developing the . A massive enrichment laboratory/plant was built in Oak ridge, Tennessee. H.C. Urey and other associates at Columbia University devised a system that separated the Uranium using the principle of gaseous diffusion. Ernest Lawrence shortly following this invention came up with a process using magnetic separation. This process was quicker then the first. After the Uranium metal was separated form the Uranium ore it is put into a gas centrifuge .... 807 words | 3 pages Subscription Length Price Join 30 days membership (recurring) $19.95 90 days membership (recurring) $39.95 180 days membership (non-recurring) $69.95