Communications Machine

The Communications Machine, or "CM", is a mechanical device used by the United States Navy for the most of the 1920s. It used a sliding alphabet system. It was developed by Agnes Meyer Driscoll and William Gresham. In 1937 the United States Congress recognized the achievement of these two by awarding them both $15,000.^[1]

References

^ "Madame X: Agnes Meyer Driscoll and U.S. Naval Cryptology, 1919 - 1940" (PDF). NSA. Archived from the original (PDF) on 18 September 2013. Retrieved 15 June 2014. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)

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[1] "Madame X: Agnes Meyer Driscoll and U.S. Naval Cryptology, 1919 - 1940" (PDF). NSA. Archived from the original (PDF) on 18 September 2013. Retrieved 15 June 2014. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)

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