Manhattan Project Timeline

Franklin D Roosevelt

Manhattan Project Timeline
Interesting Manhattan Project Timeline and facts for kids are detailed below together with details of important events leading up to the development of the Atomic Bomb. The history timeline of Manhattan Project is told in a factual timeline sequence consisting of a series of short facts providing a simple method of relating the relevant, significant events and the famous people and scientists who were involved in the Manhattan Project via the Manhattan Project Timeline.

Manhattan Project Timeline
Franklin D Roosevelt was the 32nd American President who served in office from March 4, 1933 to April 12, 1945. One of the most important events during his presidency was the development of the Atomic Bomb as detailed in the Manhattan Project Timeline.

   
  

Manhattan Project Timeline for kids
The following fact sheet contains interesting history, facts and information on the Manhattan Project Timeline for kids.

The Manhattan Project Timeline for kids: Timeline of Famous People and Events

Manhattan Project Timeline: 1919 - British physicist Ernest Rutherford and his studies of radioactivity led the exploration of nuclear physics and the discovery of the proton by artificially transmuting an element (nitrogen into oxygen).

Manhattan Project Timeline: 1931 - Harold C. Urey discovers deuterium (heavy hydrogen)

Manhattan Project Timeline: 1931 - Robert J. Van de Graaff develops the high-voltage electrostatic generator used in atomic research

Manhattan Project Timeline: 1932 - James Chadwick discovers the neutron enabling the utilization of nuclear energy.

Manhattan Project Timeline: 1932 - J. D. Cockroft and E. T. S. Walton were the first to split the atom

Manhattan Project Timeline: 1932 - Ernest O. Lawrence and his colleagues M. Stanley Livingston and Milton White successfully operated the first cyclotron. (A Cyclotron is a machine used as a circular particle accelerator for positively charged ions (usually protons, deuterons, and alpha particles) used to initiate nuclear transformations upon collision with a suitable target)

Manhattan Project Timeline: 1934 - Enrico Fermi produces fission, the splitting of an atomic nucleus resulting in the release of large amounts of energy. Szilard files a patent application for the atomic bomb describing the concept of using neutron induced chain reactions to create explosions.

Manhattan Project Timeline: 1938 - In December 1938 Otto Hahn and Fritz Strassmann discover the process of fission in uranium

Manhattan Project Timeline: 1938 - Lise Meitner and Otto Frisch provided the evidence for the Hahn-Strassmann and nuclear fission and communicated their findings to Niels Bohr

Manhattan Project Timeline: 1939 - January 26,1939: Niels Bohr who had made foundational contributions to understanding atomic structure reported on the Hahn-Strassman results at a meeting on theoretical physics in Washington, D. C.

Manhattan Project Timeline: 1939 - Walter Zinn, Enrico Fermi, Herbert L. Anderson , John R. Dunning and Leo Szilard work together at Pupin Physics Laboratories at Columbia University in New York City, investigating whether uranium-238 fissioned with slow neutrons, as Fermi believed, or only the uranium-235 isotope, as Niels Bohr contended

Manhattan Project Timeline: 1939 - Hungarian physicist Leo Szilard was the first man to realized that nuclear power could be used to build a bomb of terrifying proportions

Manhattan Project Timeline: 1939 - August 2, 1939: A letter signed by Leo Szilard and Albert Einstein was sent to Alexander Sachs, who had access to President Franklin D. Roosevelt, to inform him that "a nuclear chain reaction in a large mass of uranium" was undoubtedly possible, and could lead to the construction of "extremely powerful bombs of a new type". The letter warned that Germany might  be developing such a weapon

Manhattan Project Timeline: 1939 - September 1, 1939: Germany invades Poland and this event delays the meeting between Alexander Sachs and the President

Manhattan Project Timeline: 1939 - October 11-12, 1939: Alexander Sachs discusses Einstein's letter with President Roosevelt. FDR decides to act and appoints Lyman J. Briggs head of the Advisory Committee on Uranium, a top-secret project to investigate the possibility of utilizing energy from the atomic fission of uranium.

Manhattan Project Timeline: 1939 - October 19, 1939: President Roosevelt wrote back to Einstein informing the physicist that he had setup a committee consisting of Alexander Sachs and representatives from the Army and Navy to study uranium.

Manhattan Project Timeline: 1939 - November 1, 1939: The Uranium Committee recommends that the government purchase uranium oxide and graphite for fission research.

Manhattan Project Timeline: 1940 - February 1940: Physicists Otto Frisch and Rudolf Peierls write a theoretical analysis of the possibility of fast fission in U-235.

Manhattan Project Timeline: 1940 - The University of California begins building a giant cyclotron under the direction of Ernest O. Lawrence.

Manhattan Project Timeline: 1940 - July 1940: The U.S. Army Intelligence office denies Albert Einstein the security clearance needed to work on the Manhattan Project

Manhattan Project Timeline: 1940 - March 1940: John R. Dunning and his team demonstrate that fission is more readily produced in the rare uranium-235 isotope, not the more plentiful uranium-238.

Manhattan Project Timeline: 1940 - June 1940: Vannevar Bush is named head of the National Defense Research Committee and the Uranium Committee becomes a scientific subcommittee of the organization.

Continued...

The Manhattan Project Timeline for kids: Timeline of Famous People and Events

Facts about the Manhattan Project Timeline for kids
Our interesting Manhattan Project Timeline continues with more facts for kids that are detailed below. The history of the Manhattan Project is told in a factual timeline sequence consisting of a series of short facts providing a simple method of relating the
history and the important events and people who contributed to the Manhattan Project and the development of the Atomic Bomb.

The Manhattan Project Timeline for kids: Timeline of Famous People and Events

Manhattan Project Timeline: 1941 - February 24, 1941: Glenn T. Seaborg’s research group, including and Arthur Wahl, working at the University of California in Berkeley discovers plutonium and the group demonstrates that plutonium is fissionable on March 28, 1941

Manhattan Project Timeline: 1941 - May 3, 1941: Glenn Seaborg proves plutonium is more fissionable than uranium-235.

Manhattan Project Timeline: 1941 - June 28, 1941: Vannevar Bush is named head of the Office of scientific Research and Development and James B. Conant replaces Bush at the National Defense Research Committee

Manhattan Project Timeline: 1941 - July 2, 1941: The British MAUD report concludes that an atomic bomb is feasible and the findings are sent to Bush and Conant of the Manhattan Project .

Manhattan Project Timeline: 1941 - October 9, 1941: Vannevar Bush briefs FDR on the progress of atomic bomb research. The President instructs Bush to find out if an atomic bomb can be built and at what cost.

Manhattan Project Timeline: 1941 - The Japanese attack Pearl Harbor on December 7, 1941 and the United States enters the war on December 8, 1941.

Manhattan Project Timeline: 1942 - January 19, 1942: FDR approves production of the atomic bomb

Manhattan Project Timeline: 1942 - May 12, 1942: President Roosevelt signs an order creating a secret project, called the Manhattan Project, to develop the nuclear weapon

Manhattan Project Timeline: 1942 - September 23, 1942: Leslie Groves is put in charge of the Manhattan Project and recruits J. Robert Oppenheimer as Scientific Director.

Manhattan Project Timeline: 1942 - October 15, 1942: Leslie Groves asks J. Robert Oppenheimer to head Project Y, the new planned central laboratory for weapon physics research and design at the Manhattan Project .

Manhattan Project Timeline: 1942 - November 16, 1942: Los Alamos, New Mexico was selected as the site for Project Y, for the main atomic bomb scientific laboratory

Manhattan Project Timeline: 1942 - December 2, 1942:  Enrico Fermi and his Manhattan Project team produce the world's first controlled and self-sustained nuclear fission reaction in a squash court under Stagg Field at the University of Chicago

Manhattan Project Timeline: 1943 - January, 1943: Groves acquires the Hanford Engineer Works on the Columbia River in Washington for plutonium production reactors and separation plants for the Manhattan Project

Manhattan Project Timeline: 1943 - August 19, 1943: The Quebec Agreement, between the United States and Great Britain, was signed outlining the coordinated development of the nuclear energy and the weapons that employed nuclear energy. A large team of British and Canadian scientists moved to the US to work on the Manhattan Project.

Manhattan Project Timeline: 1943 - November 4, 1943: A large experimental graphite reactor (the X-10) was constructed at Oak Ridge nuclear facility in Tennessee to provide research quantities of plutonium

Manhattan Project Timeline: 1943 - November 29, 1943: The US Military begin remodeling the B-29 Superfortress bomber for the delivery of the Atomic bomb.

Manhattan Project Timeline: 1943 - Four different size casings were made for the Atomic bombs. "The gadget" was the code name given to the first bomb tested. The "Thin Man" bomb was long and thin representing Roosevelt and "Fat Boy" was round and fat representing Churchill. The Little Boy bomb was a development of the unsuccessful Thin Man nuclear bomb using uranium rather than plutonium.

Manhattan Project Timeline: 1943 - Project Alberta began to prepare for the delivery of atomic weapons during combat by conducting weapons delivery tests, modifying aircraft for carrying the atomic weapons developed by the Manhattan Project. The B-29 Superfortress bomber was remodeled to deliver the Atomic bomb and the organization and training of flight crews and field teams for weapons handling began.

Manhattan Project Timeline: 1944 - January 1944: Construction begins on Abelson's thermal diffusion plant at the Philadelphia Naval Yard.

Manhattan Project Timeline: 1944 - March 1944: Manhattan Project Bomb models are tested at Los Alamos.

Manhattan Project Timeline: 1944 - Oak Ridge and Hanford produce increasing amounts of fissionable material and Los Alamos makes significant progress in weapon design for the Manhattan Project.

Manhattan Project Timeline: 1944 - July 17, 1944: The plutonium gun bomb (Thin Man) is abandoned to be replaced with the Little Boy bomb

Manhattan Project Timeline: 1944 - September 1944: Colonel Paul Tibbets and the 393rd Bombardment Squadron begin test drops with dummy bombs called "Pumpkins".

Manhattan Project Timeline: 1945 - February 4-11, 1945: Roosevelt, Churchill, and Stalin meet at the Yalta Conference.

Manhattan Project Timeline: 1945 - April 12, 1945: President Franklin D. Roosevelt dies, and Harry S. Truman becomes President of the United States.

Manhattan Project Timeline: 1945 - April 25,1945: Secretary of War Henry Stimson and Groves brief President Harry Truman on the Manhattan Project.

Manhattan Project Timeline: 1945 - April 27, 1945: The first meeting of the Target Committee was held to select targets for atomic bombing.

Manhattan Project Timeline: 1945 - June 1945: Scientists issue the Franck Report, advocating international control of atomic research and proposing a demonstration of the atomic bomb prior to its use in combat.

Manhattan Project Timeline: 1945 - June 6, 1945: Henry Stimson informs President Harry Truman that the Interim Committee recommends keeping the atomic bomb a secret and using it as soon as possible without warning.

Manhattan Project Timeline: 1945 - June 14,1945: Leslie Groves, overall director of the Manhattan Project, submits the target selections to General George Marshall.

Manhattan Project Timeline: 1945 - July 16, 1945: Trinity was the code name of the first detonation of a nuclear weapon (The Gadget) conducted by the United States Army at Alamogordo, New Mexico. 'The Gadget' atomic bomb exploded with a 18,000 ton TNT equivalent

Manhattan Project Timeline: 1945 - July 26, 1945: President Truman, British Prime Minister Clement Atlee and Chinese President Chiang Kai-Shek, issue the Potsdam Proclamation, calling for Japan to surrender unconditionally. The Japanese reject the idea.

Manhattan Project Timeline: 1945 - August 6, 1945: The Little Boy, is dropped on Hiroshima. Casualties have been estimated between 90,000 and 160,000 in Hiroshima, half of victims died within 24 hours of the blast.

Manhattan Project Timeline: 1945 - August 9, 1945: Fat Man, the implosion model plutonium bomb is dropped on Nagasaki. Casualties have been estimated at least 60,000 in Nagasaki.

Manhattan Project Timeline: 1945 - 15 August, 1945: Japan surrenders bringing WW2 to an end

The Manhattan Project Timeline for kids: Timeline of Famous People and Events

Manhattan Project Timeline for kids - President Franklin Roosevelt Video
The article on the Manhattan Project Timeline provides detailed facts and a summary of one of the important events during his presidential term in office. The following Franklin Roosevelt video will give you additional important facts and dates about the political events experienced by the 32nd American President whose presidency spanned from March 4, 1933 to April 12, 1945.

Manhattan Project Timeline

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