Special theory of relativity German-born physicist Albert Einstein introduces his special theory of relativity, which states that the laws of nature are the same for all observers and that the speed of light is not dependent on the motion of its source. Einstein wins the Nobel Prize in physics in for his work on the photoelectric effect. Neutron is discovered English physicist and Nobel laureate James Chadwick exposes the metal beryllium to alpha particles and discovers the neutron, an uncharged particle. It is one of the three chief subatomic particles, along with the positively charged proton and the negatively charged electron.
Otto Hahn and Fritz Strassmann discover the process of fission in uranium.
January 26, Bohr reports on the Hahn-Strassman results at a meeting on theoretical physics in Washington, D. Roosevelt, alerting the President to the importance of research on chain reactions and the possibility that research might lead to developing powerful bombs.
September 1, Germany invades Poland. Roosevelt decides to act and appoints Lyman J. Briggs head of the Advisory Committee on Uranium. October 19, Roosevelt informs Einstein that he has set up a committee to study uranium.
October 21, The Uranium Committee meets for the first time. November 1, The Uranium Committee recommends that the government purchase graphite and uranium oxide for fission research. March John R. Dunning and his colleagues demonstrate that fission is more readily produced in the rare uranium isotope, not the more plentiful uranium Spring-Summer Isotope separation methods are investigated.
The Uranium Committee becomes a scientific subcommittee of Bush's organization.
February 24, Glenn T. Seaborg's research group discovers plutonium. March 28, Seaborg's group demonstrates that plutonium is fissionable. May 3, Seaborg proves plutonium is more fissionable than uranium May 17, A National Academy of Sciences report emphasizes the necessity of further research.
June 22, Germany invades the Soviet Union. June 28, Bush is named head of the Office of scientific Research and Development. July 11, A second National Academy of Sciences report confirms the findings of the first. Wallace on the state of atomic bomb research. Roosevelt instructs Bush to find out if a bomb can be built and at what cost.
Bush receives permission to explore construction needs with the Army. December 7, The Japanese attack Pearl Harbor. December 10, Germany and Italy declare war on the United States. December 16, The Top Policy Committee becomes primarily responsible for making broad policy decisions relating to uranium research.
January 19, Roosevelt responds to Bush's November 27 report and approves production of the atomic bomb. March 9, Bush gives Roosevelt an optimistic report on the possibility of producing a bomb. May 23, The S-1 Executive Committee recommends that the project move to the pilot plant stage and build one or two piles reactors to produce plutonium and electromagnetic, centrifuge, and gaseous diffusion plants to produce uraniumFifty Years From Trinity The Seattle Times has created one of the definitive sites examining the development of the atomic bomb.
The Manhattan Project, which included some of history's greatest scientific minds, lead to the end of the war against the Japanese. Jul 26, · Watch video · The Manhattan Project was the code name for the American-led effort to develop a functional atomic weapon during World War II.
The controversial creation and eventual use of the atomic bomb. The Los Angeles–Owens River Aqueduct is completed, bringing water miles from the Owens Valley of the Sierra Nevada Mountains into the Los Angeles basin.
34th Street Select Bus Service M34/M34A Select Bus Service began on November 13, Overview | Updates | Design | Community Outreach and Reports | Timeline.
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Sandia National Laboratories' roots lie in World War II's Manhattan Project, which built the world's first atomic bombs. Its history reflects the changing national security needs of postwar America.
Although Sandia originated as a single-purpose engineering organization for nonnuclear components of nuclear weapons, today it is a multiprogram laboratory engaging in broad spectrum national.