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Discovery of Nuclear Fisson
With the discovery of nuclear fission atom bombs are considered theorticly possible -
The Einstein–Szilárd letter
In a letter written by Leó Szilárd and signed by Albert Einstein the two men the united states of the potential of a German super weapon and the necessity to ensure uranium stockpiles and begin research into nuclear chain reaction -
Advisory Committee on Uranium
Lyman Brigs of the NBS (National Bureau of Standards) holds a meeting to investigate the potential of uranium to create weapons of mass destruction. This Group would latter refer to Roosevelt that the issues presented in the letter were true and that uranium would be able to surpass any destructive force available at the time. -
Formation of the National Defense Research Committee
The Advisory group is turning into a official government recognized Committee -
British Collaberation
Britain decides to share its research on atomic bombs with the United States just to discover its research projects are smaller and less funded than their own. -
Oppenheimer Joins the Team
After Gregory Breit left the project due to his concerns over its lack of security Oppenheimer accepts an offer to join the research project. -
Creation of isotope 235
Most mined uranium contains mostly (99.3%) isotope 238 uranium that proved sub optimal for the purpose of creating nuclear weapons. However at the Y-12 uranium enrichment facility in oak ridge a reliable refining method is created. This breakthrough allowed easily acquired and large amounts of the the more useful uranium 235 -
Operation Silverplate
Operation Silverplate was the code name given to the secret task of modifying B-29 bomber to carry and drop the atom bomb on Hiroshima, and latter Nagasaki. This was made a necessity because the two proposed bombs would be too long or too wide to drop from the original B-29 and the only aircraft able to hold and drop such a bomb was of British construction but would be too heavy to be carried by it. However the operation was proved feasible when both bomb bays were combined into one. -
Interim Committee is formed
A committee was created to advise the united states on postwar use of nuclear arms -
Trinity
After a long period of research and smaller tests it was decided that a full scale test of what they called implosion style bombs needed to be performed. This test created an explosion equal to 20 kilotons of TNT. -
Hiroshima
The atomic bomb Little Boy is used on the city of Hiroshima -
Nagisaki
The Atomic Bomb Fat man is dropped on the city of Nagisaki
