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  Piece

  WF Clarke's personal papers: comments on written histories of Battle of Jutland and...

  WF Clarke's personal papers: comments on written histories of Battle of Jutland and Admiralty cover-ups and a meeting with Admiral Beatty in 1918

  Held by

  The National Archives, Kew

  Date

  1924

  Reference

  HW 7/25

• Catalogue level

  Piece

  Comments between PM and ISL regarding action on reports of Italian Benghazi bound...

  Comments between PM and ISL regarding action on reports of Italian Benghazi bound convoy; Japanese ambassador, Berlin, reports Hitler's statement of intent in event of US-Japan conflict

  Held by

  The National Archives, Kew

  Date

  1941 Aug 24

  Reference

  HW 1/25

• Catalogue level

  Piece

  Weekly reports on Second World War German army and air force communications

  Weekly reports on Second World War German army and air force communications

  Held by

  The National Archives, Kew

  Date

  1944 May 05-1944 Jun 01

  Reference

  HW 45/25

• Catalogue level

  Piece

  German exploitation of Russian Agent communications. Prisoner of war report

  German exploitation of Russian Agent communications. Prisoner of war report

  Held by

  Creating government department or its successor

  Date

  1945 Nov 06

  Reference

  HW 40/25

• Catalogue level

  Piece

  B.T.M. 3-Wheel Bombes and B.T.M. and W.W. 4-Wheel Bombes; USA 4-Wheel Bombes. Mr...

  B.T.M. 3-Wheel Bombes and B.T.M. and W.W. 4-Wheel Bombes; USA 4-Wheel Bombes. Mr Fletcher's Registers of Bombes. The 'Bombe', a name possibly given by the Poles, who produced the first ENIGMA code-breaking machine, was developed by Alan Turing and ot…

  Held by

  The National Archives, Kew

  Date

  1939 Sep 01 - 1945 May 18

  Reference

  HW 25/29

• Catalogue level

  Piece

  Historical Section correspondence relating to Bombe production and deployment, including...

  Historical Section correspondence relating to Bombe production and deployment, including copy of Fletcher's Bombe Registers

  Held by

  The National Archives, Kew

  Date

  1939 Sep 01 - 1951 Sep 04

  Reference

  HW 25/31

• Catalogue level

  Piece

  Morsex (Phantom), plans for a morse secrecy apparatus

  Morsex (Phantom), plans for a morse secrecy apparatus

  Held by

  Creating government department or its successor

  Date

  1932 Jun 14 - 1947 Jun 30

  Reference

  HW 25/35

• Catalogue level

  Piece

  Report on speech secrecy system DELILAH, a technical description compiled by A M...

  Report on speech secrecy system DELILAH, a technical description compiled by A M Turing and Lieutenant D Bayley REME

  Held by

  The National Archives, Kew

  Date

  1945 Jan 01 - 1946 Dec 31

  Reference

  HW 25/36

• Catalogue level

  Piece

  Dossiers - Air Ministry. Notes on the development of the Royal Air Force intelligence...

  Dossiers - Air Ministry. Notes on the development of the Royal Air Force intelligence organisation and on the use of Sigint within the Air Ministry

  Held by

  The National Archives, Kew

  Date

  1939 Feb 01 - 1944 Nov 30

  Reference

  HW 50/25

• Catalogue level

  Piece

  British Joint Communications-Electronics Board (BJCEB) - Committee K: minutes of...

  British Joint Communications-Electronics Board (BJCEB) - Committee K: minutes of meetings of British Joint Radio Warfare Committee

  Held by

  The National Archives, Kew

  Date

  1955 July-1955 Oct

  Reference

  HW 9/25

• Catalogue level

  Piece

  History of HMS Anderson

  History of HMS Anderson

  Held by

  The National Archives, Kew

  Date

  1946

  Reference

  HW 4/25

• Catalogue level

  Piece

  German naval forces reorganisation in the Black Sea following Russian attacks in...

  German naval forces reorganisation in the Black Sea following Russian attacks in the Crimea (ZGR !-11)

  Held by

  The National Archives, Kew

  Date

  1943 Oct 29-1944 Apr 05

  Reference

  HW 18/25

• Catalogue level

  Piece

  Bombe registerDetails of availability of 3- and 4- wheel bombes from BTM (British...

  Bombe registerDetails of availability of 3- and 4- wheel bombes from BTM (British Tabulating Machines), WW (modified bombe invented by Wynne-Williams of TRE Malvern, built at Maudsleys, Dursley) and US sources.

  Held by

  The National Archives, Kew

  Date

  1939 Sep 01-1945 May 31

  Reference

  HW 25/17

• Catalogue level

  Piece

  Notes on BOMBEs: policy, production, availability and statistics, assembled by the...

  Notes on BOMBEs: policy, production, availability and statistics, assembled by the Historical Section, GC & CS in 1950

  Held by

  The National Archives, Kew

  Date

  1939 Nov 01-1950 Jun 20

  Reference

  HW 25/21

• Catalogue level

  Piece

  The Welchman papers describing the organisation of ENIGMA and the recovery of its...

  The Welchman papers describing the organisation of ENIGMA and the recovery of its key usage

  Held by

  The National Archives, Kew

  Date

  1941 Jan 01 - 1943 Dec 31

  Reference

  HW 25/27

• Catalogue level

  Piece

  Chief Cryptographer [Brigadier Tiltman]. Miscellaneous cryptological papers

  Chief Cryptographer [Brigadier Tiltman]. Miscellaneous cryptological papers

  Held by

  The National Archives, Kew

  Date

  1943 Jan 04 - 1945 Apr 15

  Reference

  HW 25/33

• Catalogue level

  Piece

  Colossus Working Aids. Colossus was the first computer, used at Bletchley Park for...

  Colossus Working Aids. Colossus was the first computer, used at Bletchley Park for cryptanalytic work, in particular on Tunney, the German High Command on-line cypher. This folder contains various instructions and working aids for use by personnel ma…

  Held by

  The National Archives, Kew

  Date

  1945 Jan 01 - 1945 Aug 30

  Reference

  HW 25/34

• Catalogue level

  Piece

  Final Report - Parallel Grenade. Report on the design of an attachment for a US Navy...

  Final Report - Parallel Grenade. Report on the design of an attachment for a US Navy (Op-20-G) bombe used for breaking ENIGMA messages

  Held by

  The National Archives, Kew

  Date

  1944 Mar 25 - 1944 Jun 15

  Reference

  HW 25/30

• Catalogue level

  Piece

  Personnel at Bletchley Park, Eastcote and British embassies abroard

  Personnel at Bletchley Park, Eastcote and British embassies abroard

  Held by

  The National Archives, Kew

  Date

  1943 Nov 20 - 1944 Nov 08

  Reference

  HW 64/25

• Catalogue level

  Piece

  Miscellaneous photographs of ENIGMA, TUNNY and COLOSSUS

  Miscellaneous photographs of ENIGMA, TUNNY and COLOSSUS

  Held by

  The National Archives, Kew

  Date

  Reference

  HW 25/26