The Turing-Welchman Bombe was an electro-mechanical device used at Bletchley Park and its outstations during World War II to assist in breaking the Enigma cipher used by the German military.

Based on ideas from a device known as a bomba, designed in Poland by Marian Rejewski as early as 1939, the Turing-Welchman Bombe enabled Bletchley Park to find the daily keys of the Engima machine on a regular basis throughout most of the war.

The British Bombe was designed by Alan Turing with important additions by Gordon Welchman. They were built by the British Tabulating Machine Company in Letchworth, Hertfordshire.

Virtual Bombe is a 3d Turing-Welchman Bombe simulation which can run using just your browser. No install is necessary.