The Story In Depth

There are many documented sources of information regarding the Dayton code breaking effort. The most dramatic and detailed are at the National Archives at College Park, Maryland. However, some documents remain in the NCR Archive at Dayton History. And there is much research yet to be done. The list below contains links to documents and information available at this site.

In This Section

Early Electronics, 1938 to 1942
1938 Proposal
The Accumulator
Navy Personnel
Teletype messages, June 1943
- Glossary of terms in messages
- Personnel in teletype messages
- 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
1942 Research Report
CNO to Adm. King / Mar 1943
Bombe correspondence
Bombe Project History, April 1944
Bombe Project History, May 44
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
Electronics
- The 1939 Desch/Mumma Calculator
- Cryptanalytic Equipment in operation
- Specs for the Thyratron
- Chassis of the Cryptanalytic Bombe
Op-20-G conference on patents, July 1945
Patents and related Documents
- Patents originating in the Electrical Research Laboratory
- Secrecy Order on Patent Applications 15 June 1945
- Patent applications, June 1945
- Final Report
- Op-20-G conference on patents 11jul45
Meader/Postwar Report
- Meader/Postwar Report, pages 13-20
- Meader/Postwar Report, pages 21-25
Presidential Medal for Merit
History Op-20-G-4E/ late 1945
Index to Desch-Mumma 1973 Interview
- Desch-Mumma Interview, day 1, tape 1, side 1
- Desch-Mumma interview, day 1, tape 1, side 2
- Desch-Mumma interview, day 1, tape 2, side 1
- Desch-Mumma Interview, day 1, tape 2, side 2
- Desch-Mumma interview, day 2, tape 1, side 1
- Desch-Mumma Interview, day 2, tape 1, side 2
- Desch-Mumma interview, day 2, tape 2, side 1
Links to more declassified documents

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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
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Stray Thoughts in the Information Age

…It appears that the concept we call ‘information’ has a deep signifcance in the universe. We are used to living in what is sometimes called ‘the information age’. Information can be packaged in more electronic forms, dispatched more quickly and received more easily than ever before…The ultimate limit that we can expect to be placed upon information storage and processing rates are imposed by the constants of Nature…

The Constants of Nature, John D. Barrow, Chapter 3

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