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  • Welcome
  • The Story in Brief
    • By the Numbers…
    • US Navy Cryptanalytic Bombe
    • Joseph R. Desch
    • Op-20-G
    • Naval Communications Annex, 3801 Nebraska Avenue
    • Turing in Dayton
    • The Accumulator
    • Notes & Sources
    • News difficult to ignore…
    • Webmaster Debbie Anderson
  • The Story In Depth
    • 1938 Proposal
    • The Story of You in Navy Blue
    • Use of Navy WAVES in Dayton
    • 1942 Research Report
    • Bombe correspondence
    • CNO to Adm. King / Mar 1943
    • 1943 Roster
      • 43 Roster, page 2
    • 1944 Roster
      • 44 Roster, page 2
    • Records of the USNCML
      • Orders 22 Sept 1943
      • Orders 22 Nov 1944
      • Orders 1 Oct 1945
      • Orders 7 Feb 1946
      • Orders 28 Jun 1946
      • Orders 15 Aug 1946
      • Navy Contract NXs7892
      • Numbers used in reference to Navy Equipment
      • Personnel numbers
      • Commendation
      • Orders 3 Jan 1945
    • Wenger/Report Oct 1944
    • Teletype messages, June 1943
      • Glossary of terms in messages
        • Glossary, second page
      • Personnel in teletype messages
        • Personnel in messages, p. 2
      • 21 Jun 1943 2:45 am
      • 21 June 1943 12:40 pm
      • 21 June 1943 3:50 pm
      • 21 June 1943 5:52 pm
      • 21 June 1943 6:03 pm
      • 21 Jun 1943 7:35 pm
    • Electronics
      • The 1939 Desch/Mumma Calculator
      • Cryptanalytic Equipment in operation
      • Specs for the Thyratron
      • Chassis of the Cryptanalytic Bombe
    • Patents and related Documents
      • Patents originating in the Electrical Research Laboratory
      • Secrecy Order on Patent Applications 15 June 1945
      • Patent applications, June 1945
      • Op-20-G conference on patents 11jul45
      • Final Report
    • Bombe Project History, May 44
    • The ERL in the NCR News
      • NCR News April 1944
      • May 1944 NCR News
      • June 1944 NCR News
      • July-August 1944 NCR News
      • NCR News September 1944
      • NCR News October 1944
      • NCR News November 1944
      • NCR News December 1944
      • March 1945 NCR News
      • NCR News April 1945
      • NCR News: Purple Heart Ceremony
      • NCR News February 1945
    • Presidential Medal for Merit
    • History Op-20-G-4E/ late 1945
    • Meader/Postwar Report
      • Meader/Postwar Report, pages 13-20
      • Meader/Postwar Report, pages 21-25
    • Desch-Mumma 1973 Interview
      • Jan. 17, 1973: pages 1-43
      • Jan. 17, 1973: pages 44-86
      • Jan. 17, 1973: pages 87-166
      • Jan. 18, 1973: pages 1-43
      • Jan. 18, 1973: pages 44-86
      • Jan. 18, 1973: pages 88-125 (in progress)
  • In The Documentary
    • The Documentary Team
    • DVD Availability
  • Personnel
    • Navy Personnel
    • WAVES stationed at the USNCML
      • WAVES, p. 2
      • WAVES, p. 3
      • WAVES, p. 4
      • WAVES, p. 5
      • The WAVES of Sugar Camp
        • Betty Bemis
        • Joan Precht
        • Evelyn Urich
        • Dolores Cheek
        • Paul and Shirley Mackenzie Anderson
        • Veronica Hulick
        • Alvida Goguen
        • Sue Unger
    • Marines stationed at the USNCML
    • NCR workers at the USNCML
    • Staff of the Electrical Research Lab
      • More about the ERL Staff
  • And more . . .
    • Contact information
    • Sitemap
    • Timelines
    • For further reading
    • Links to more information
    • Glossary of common terms
    • Milestone in Engineering
    • For the Record
    • Build a bombe?
    • Joe Desch Award
      • 2008: John Janning
      • 2009: Dr. Peter T. Brody
      • 2010: Drs. Ken Jordan and John Birden
      • 2011: Whitfield Diffie
      • 2013: Dr. Jacek M. Zurada
Dayton Codebreakers
A story that was secret for 50 years

Electronics

In This Section

  • The 1939 Desch/Mumma Calculator
  • Cryptanalytic Equipment in operation
  • Specs for the Thyratron
  • Chassis of the Cryptanalytic Bombe

  • A FEW OF OUR PAGES

    • Meader/Postwar Report
    • Navy Contract NXs7892
    • In The Documentary
    • Bombe correspondence
    • Electronics
    • The ERL in the NCR News

    • CODE GIRLS

      In the summer of 2015 I was contacted by an author interested in the stories of the Sugar Camp WAVES–one of my favorite topics. Now their story as well as that of the WACS at Arlington Hall is available and wonderfully successful.

      “Code Girls is an extraordinary book by an extraordinary author. Liza Mundy’s portraits of World War II codebreakers are so skillfully and vividly drawn that I felt as if I were right there with them—mastering ciphers, outwitting the Japanese army, sinking ships, breaking hearts, and even accidentally insulting Eleanor Roosevelt. I am an evangelist for this book: You must read it.”
      author of The Good Girls Revolt – Lynn Povich

    • To the National Archives

      This site would not exist except for the treasure that is our National Archives.

    • RSS Today's Document from the National Archives

      • Crisis in Little Rock
        This executive order of September 23, 1957, signed by President Dwight Eisenhower, sent Federal troops to maintain order and peace while the integration of Central High School in Little Rock, AR, took place. Read more at Our Documents...

    I ask that visitors be patient when links or pages disappear or become mangled in the vagaries of PHP and generated code. Frequent additions and updates make for human error -- please report any broken links or other problems to Deborah Anderson, site manager--your help is appreciated.

    E-mails to Deborah Anderson, in care of Dayton Codebreakers, are still appreciated, and I will try to respond promptly. Your messages are what make this job worthwhile.

    Use of materials by permission. Materials other than those clearly marked as National Archives materials are not in the public domain. More information here.