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Papers relating to HMS Mercury consisting of manuscripts relating to the history of signalling, 1781 to 1914. The printed part of the original collection, also to 1914, is in the Library. The manuscripts include sixteen late eighteenth- and early nineteenth-century signal books; a book of codes for use with an electric telegraph, 1855; correspondence concerning the rules for the use of wireless telegraphy, 1893; correspondence and photographs relating to the development of communication by flashing signals, 1861 to 1893, 1904; a collection of annual reports on the Naval Pigeon Service, 1903 to 1908; proposed Forming, Disposing and Stationing Signals, 1890 and 1892; correspondence on Equal and Unequal speed manoeuvres, 1891 to 1892, and on Battle Tactic Signals, 1901. Foremost among the correspondents on these and other subjects is the first Superintendent of the Signal School, Admiral A.F. Everett (1868-1938).

Papers of the India, Pakistan, Bangladesh and Ceylon Conferences. They include Minute Books (1885-1990), Annual Reports (1964-1972), Letterbooks (1952-1994), Visits of Conference Delegates (1967-1986) and Freight Tariffs (1915-1985) from various Conferences held between 1885 and 1994.

Pendant and vane lists are included in this category; amongst these is a sheet of distinguishing signals issued by Lord Howe, 1794; a number of sheets of signals which were issued in addition to the printed signals, which include two recognition signals issued by the Admiralty for naval vessels and East Indiamen, 1778 and 1780.

Signals: Foreign. There are three printed sheets of French signal flags, 1766, in this category.

Signals: Theory. Included in this small group of documents are a description of Colonel Pasley's telegraph of 1804 and 'Observations on Signal Shapes as applied to the character of Signals Flags', 1818, by Captain Thomas Shortland (1771-1827).