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World War II Technology  mid 1930s - 1940s Franklin D. Roosevelt Winston Churchill Adolf Hitler Alan Turing John Mauchley 1932: Polish Army breaks early version of German Enigma code ciphering machine. 1939: Blechley Park, Great Britain established as center for code breaking activities. 1939: Hitler Invades Poland. 1940: Alan Turing develops Bombe, high-speed electro-mechanical calculator. 1940: Winston Churchill delivers "Blood, Toil, Tears " speech. 1941: United States enter World War II. 1942: John Mauchly proposes development of completely electronic "computer". 1946: Mauchly and Eckert release ENIAC. Tony Sales(left kiosk), http://www.codesandciphers.org.uk/ Marion Rejewski (left kiosk), http://home.us.net/~encore/Enigma/enigma.html ENIAC (rear wall), http://www.library.upenn.edu/special/gallery/mauchly/jwmintro.html Blechley Park Mansion (left wall), http://www.codesandciphers.org.uk/ Colossus (right wall), http://www.bletchleypark.org.uk/ T.C. Rosas