Secret packs of the Commander in Chief Grand Fleet, Volume XVI, pack 008, sections...

Secret packs of the Commander in Chief Grand Fleet, Volume XVI, pack 008, sections 5 to 15.

Loss of confidential books: Miscellaneous: Wireless misc.: Wireless,telegrams and ciphers: Ciphers misc.: American battleships: Grand Fleet code: Vocabulary signal book: Entry into defended ports and swept channels: Search for submarines: Miscellaneous.

Folio 1: Title page.

Folio 2: Explanatory note During the period of the War, papers of a confidential nature in the office of the C-in-C Home Fleet were filed in Packs (numbered separately from the non-confidential records) in a Series 001 to 0042 inclusive. Copies of relevant telegrams were filed in these packs, but a complete set of all telegrams was also maintained. The secret packs were re-arranged by the Grand Fleet Secretarial staff in February 1919, when papers considered unimportant were removed and destroyed, and the remainder re-indexed. They were received in this form by the Historical Section in April 1920, and bound as received, in a series of Volumes. The 1919 index will be found in the first volume (see ADM 137/1881) and extracts from this have been inserted in each succeeding volume. This volume is the 16th of the series.

Folio 3: Index of contents. Trade - The Blockade.

Folios 4-7: Blank.

Folios 8-11: Contents pages.

Section V - Loss of confidential books.

Folios 12-32: HMS King Edward VII's confidential books to be returned to depot.

Folios 33-37: HMS Arethusa. Commodore 'T'. Confidential.

Folios 38-39: HMS Warrior. Confidential books.

Folios 40-90 [transferred to ADM 137/3682].

Folios 91-238 [transferred to ADM 156/176].

Folios 239-261 [destroyed 5 July 1968].

Section VI - Miscellaneous.

Folios 263-269: HMS Centurion. Transportation table.

Folios 270-275: Compromising of ciphers. C-in-C's views May 1915.

Folios 276-280: Secret Packets 'F' and 'G'. Safe keeping on ships. C-in-C North America and West Indies. September 1915.

Folios 281-283: HMS Queen Elizabeth. Mustering of signal books.

Folios 284-285: Wireless signals made at Rosyth. 17/18 January 1918.

Section VII - Wireless Miscellaneous.

Folios 287-292: Method of transmitting wireless messages at sea. May 1917.

Folios 293-303: Proposals to reduce complexity of ciphering and deciphering. May 1917.

Folios 304-309: Wireless communications with submarines.

Folios 310-324: Admiralty codes. Use of for wrong class of message.

Folios 325-326: Signalling difficulty on night 17/18 October 1917.

Folios 327-329: Reduction of cipher work.

Folios 330-337: Weather reports.

Folios 338-339: Passing wireless messages to ships on patrol. August 1918.

Folio 340: Wireless distinguishing groups for submarines. September 1918.

Section VIII - Wireless, telegrams and ciphers. Miscellaneous.

Folios 342-343: Prefixes to specially secret messages.

Folio 344: Delay at the Admiralty in replying to C-in-C.

Folio 345: Possibility of confusion in language in telegrams.

Folios 346-347: Cipher messages. Suggestions to reduce time and labour involved.

Folios 348-357: Telegrams received at Rosyth during absence of C-in-C.

Folio 358: Distribution of 'R' messages at Northern base in absence of C-in-C.

Section IX - Ciphers. Miscellaneous.

Folios 360-365: Replacement of cipher 'C' by new cipher. December 1914.

Folios 366-376: Foreign Office ciphers. Supply to ships.

Folios 377-395: Compilations of ciphers. C-in-C. December 1915.

Folios 396-397: New cipher to supersede cipher 'C' and geographical table.

Section X - American battleships.

Folio 399: US general signal book.

Folios 400-412: Issue of signal books to US Battleships.

Folio 413: Call signals allotted to US battleships.

Folios 414-420: 6th Battle squadron. Distribution of confidential books.

Folios 421-422: 6th Battle squadron. Confidential books received from Admiralty.

Folios 423-425: Repairs and leave in 6th Battle squadron.

Section XI - Grand Fleet code.

Folios 427-432: Grand Fleet code. October 1914.

Folios 433-434: Requirements of signal books and codes in Grand Fleet.

Folios 435-436: Compromise of Grand Fleet code No 3.

Folios 437-438: Revision of Grand Fleet code.

Section XII - Vocabulary signal book.

Folios 440-460: Vocabulary signal book No 1. Compromise of April 1916.

Folios 461-466: Proposed continuance of special Grand Fleet vocabulary signal book. September 1917.

Folio 467: Spare vocabulary signal book in Grand Fleet ships.

Section XIII - Entry into defended ports and swept channels.

Folios 469-473: Instructions for entry into defended ports of the UK. 23 March 1915.

Folios 747-510: Proposed amendments to instructions for entry into defended ports and swept channels by C-in-C.

Folios 511-522: Swept channels. Proposed amendments. April 1915.

Folios 523-527: Swept channels. Cromarty. April 1915.

Folios 528-530: Swept channels. Orkneys and Shetlands. April 1915.

Folios 531-532: OD 21. Supply. Entry into defended ports of the UK.

Folios 533-548: OD 21. Supply.

Folios 549-577: Revision of OD. 21 January 1916.

Folios 578-588: Kirkwall and Lerwick. Alterations to OD 21 March 1916.

Folios 589-596: Information as regards Scapa, Lerwick and Kirkwall in OD 4.

Folios 597-603: Cromarty. Amendments to OD 21 and OD 4. July 1916.

Folios 604-607: Proposed amendment of coast defence scheme to admit entry of submarines and destroyers at night. September 1916.

Folios 608-610: Supply of OD 21 to destroyers.

Folio 611: Suspension of procedure for entry into certain ports.

Section XIV - Search for submarines.

Folios 613-624: Method of searching for submarines. December 1915.

Folios 625-628: Remarks on submarine attack. OD 20.

Folios 629-638: Method of searching for submarines. Lieutenant Hutchison HMS Carysfoot. June 1916.

Folios 639-665: Revision of OD. 20 June 1916.

Folios 666-692: CB 1238. Method recommended for carrying out searches for hostile submarines. October 1916.

Folios 693-705: Search for submarines. Problem of best means. HMS King George V. September 1916.

Folios 706-707: Remarks on submarine warfare. December 1916.

Folios 708-713: Squared chart method of searching for submarines. March 1917.

Folios 714-715: Enemy submarine near a fleet base. Procedure for assembly of destroyers. March 1917

Section XV - Miscellaneous.

Folios 718-720: Confidential books. HMS Queen Elizabeth.

Folio 721: AFR signal book. Addenda to June 1917.

Folios 722-727: Call signs etc of position of hostile airships to ships with seaplanes.

Folio 728: New edition of diversion code. June 1918.

Folios 729-730: Clerical work in ships. HMS Castor. June 1918.

Folio 731: Enemy reports. June 1918.

Folios 731a-732: Safe for secret and confidential books.

Folios 733-734: The Nore wireless instructions. June 1918.

Folio 735: Secret package 'Z' into force on 16 August 1918.

Folio 736: Form No 13. Recognition signals in force.

Folio 737: Document Pli IS No 4 into force on 31 December 1918