Royal Society reprint of a lecture given in 1927 by Sir [James] Alfred Ewing [head of the Department of the Admiralty dealing with enemy cipher, 1914–17], with an introduction by [Reginald] R V Jones, Joint Editor, Notes and Records of the Royal Society, on the initiation and development of naval cryptography in the First World War.

Papers relating to Mavis Batey's work at Bletchley Park. The collection is mainly comprised of later articles and notes for speeches by Batey including memories about her work and her colleagues, and a small amount of correspondence with historians of intelligence. Also includes copies and transcripts of wartime documents.