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
  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.
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