Computers

• Charles Babbage's Difference Engine #2 design of 1832, as constructed by the Science Museum, London, in 1991 for the bicentennary of B's birth.
  11/2004: A second copy was under construction for a US museum.

• Millionaire calculator.

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• A world war II 3-rotor Enigma machine. It is an electro-magnetic device not a computer, but it "inspired" the special-purpose code-breaking computers at Bletchley Park which decoded the Ultra intelligence for the allies.

• SSEM c1949

  [computer50.org] tells the story of the "Baby" stored-program computer, first run on 21 June 1948, and of other early Manchester computers.

• U.S. Army Photo, #163-12-62, left to right: Patsy Simmers and ENIAC board, Mrs. Gail Taylor and EDVAC board, Mrs. Milly Beck and ORDVAC board, Mrs. Norma Stec and BRLESC 1 board, from Historic Computer Images by Mike Muuss.

• recursion.