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British government department tasked with improving accurate marine chronometry
Board of Longitude Formation 1714 (1714 ) Founder Longitude Act 1714 Dissolved 1828 (1828 ) Type Government body Purpose administration of a scheme of prizes intended to encourage innovators to solve the problem of finding longitude at sea Membership 24 (in 1714)
United Kingdom legislation
The Commissioners for the Discovery of the Longitude at Sea , or more popularly Board of Longitude , was a British government body formed in 1714 to administer a scheme of prizes intended to encourage innovators to solve the problem of finding longitude at sea.
Navigators and scientists had been working on the problem of not knowing a ship's longitude. The establishment of the Board of Longitude was motivated by this problem and by the 1707 grounding of four ships of Vice-Admiral Sir Cloudesley Shovell 's fleet off the Isles of Scilly , resulting in heavy loss of life. Established by Queen Anne the Longitude Act 1714 named 24 Commissioners of Longitude, key figures from politics, the Navy, astronomy and mathematics.[ 1] [ 2] John Harrison 's marine timekeeper.
The Board administered prizes for those who could demonstrate a working device or method. The main longitude prizes were:
£10,000 for a method that could determine longitude within 60 nautical miles (110 km; 69 mi) (£1,800,000 as of 2023)
£15,000 for a method that could determine longitude within 40 nautical miles (74 km; 46 mi) (£2,700,000 as of 2023)
£20,000 for a method that could determine longitude within 30 nautical miles (56 km; 35 mi) (£3,700,000 as of 2023). In addition, the Board had the discretion to make awards to persons who were making significant contributions to the effort or to provide financial support to those who were working towards a solution. The Board could also make advances of up to £2,000 for experimental work deemed promising.[ 3] John Harrison before he received his main prize, an award of £3,000 to the widow of Tobias Mayer , whose lunar tables were the basis of the lunar data in the early decades of The Nautical Almanac Leonhard Euler for his (assumed) contribution to the work of Mayer, £50 each to Richard Dunthorne and Israel Lyons for contributing methods to shorten the calculations connected with lunar distances, and awards made to the designers of improvements in chronometers.
Even though many tried their hand at winning the main prize, for decades none was able to come up with a practical solution to the problem. The Board recognised that any serious attempt would be based on the recognition that the earth rotates through 15° of longitude every hour. The comparison of local time between a reference place (e.g., Greenwich ) and the local time of the place in question would determine the longitude of that place. Since local apparent time could be determined with some ease, the problem centred on finding a means of determining (or in the case of chronometers, keeping) the time of the reference place when one is far away from it.
For details of the efforts towards determining the longitude, see History of longitude .
[ edit ] For many decades a sufficiently accurate chronometer was prohibitively expensive. The lunar distance method was used by mariners either in conjunction with or instead of the marine chronometer. However, with the expectation that accurate clocks would eventually become commonplace, John Harrison showed that his method was the way of the future. However, the board never awarded the prize to Harrison, nor anyone else.
With the significant problems considered as solved, the Board of Longitude was abolished by Act of Parliament in 1828 and replaced by a Resident Committee for Scientific Advice for the Admiralty consisting of three scientific advisors: Thomas Young , Michael Faraday and Edward Sabine .[ 4]
Direction and control Boards and offices under Direction of Secretariat and staff under Operational planning, policy Divisions and sections Offices of the Sea Lords Admiralty civil departments
Admiralty Area Cash Offices Admiralty Central Dockyard Laboratory Admiralty Central Metallurgical Laboratory Admiralty Civilian Shore Wireless Service Admiralty Compass Observatory Admiralty Constabulary Admiralty Constabulary Headquarters Admiralty Engineering Laboratory Admiralty Experimental Station Admiralty Experiment Works Admiralty Gunnery Establishment Admiralty Interview Board Admiralty Labour Department Admiralty Marine Technology Establishment Admiralty Materials Laboratory Admiralty Mine Design Department Admiralty Mining Establishment Admiralty Naval Aircraft Materials Laboratory Admiralty Record Office Admiralty Regional Offices Admiralty Research Laboratory Admiralty Signal Establishment Admiralty Signals and Radar Establishment Admiralty Surface Weapons Establishment Admiralty Surveying Service Admiralty Torpedo Experimental Establishment Admiralty Underwater Weapons Establishment Admiralty Underwater Weapons Launching Establishment Architectural and Engineering Works Department Air Equipment and Naval Photography Department Air Department Air Materiel Department Air Personnel Department Amphibious Warfare Headquarters Armament Supply Department Board of Invention and Research Board of Longitude Boom Defence Department Boom Defence and Marine Salvage Department Britannia Royal Naval College Chemical Board Chemical Department Civil Catering Department Civil Engineer in Chiefs Department Coastguard and Reserves Branch Combined Operations Headquarters Commissioner for Property and Income-tax for the Naval Department Compass Department Contract and Purchase Department Council of Naval Education Dental Examining Board Department of Radio Equipment Department of the Accountant-General of the Navy Department of Aeronautical and Engineering Research Department of Miscellaneous Weapons Development Department of Naval Assistant (Foreign) to Second Sea Lord Department of Naval Education Operational Research Department of Personal Services and Officer Appointments Department of Physical Research Department of Physical Training & Sports Department of Radio Equipment Department of Research Programmes and Planning Department of Superintendent of de-magnetisation Department of the Admiral of the Training Service Department of the Chief Inspector of Naval Ordnance Department of the Chief of Naval Information Department of the Chief Scientist Department of the Civil Engineer-in-Chief Department of the Comptroller of Steam Machinery Department of the Comptroller of Victualling and Transport Services Department of the Controller of the Navy Department of the Controller-General of Merchant Shipbuilding Department of the Controller for Navy Pay Department of the Deputy Controller for Auxiliary Shipbuilding Department of the Deputy Controller for Dockyards and Shipbuilding Department of the Director Contract-Built Ships Department of the Director-General Aircraft Department of the Director-General of Manpower Department of the Director-General, Supply and Secretariat Branch Department of the Director of Aircraft Maintenance and Repair Department of the Director of Contract Labour Department of the Director of Dockyards Department of the Director of Electrical Engineering Department of the Director of Manning Department of the Director of Merchant Shipbuilding Department of the Director of Merchant Shipbuilding and Repairs Department of the Director of Merchant Ship Repairs Department of the Director of Naval Construction Department of the Director of Naval Equipment Department of the Director of Naval Recruiting Department of the Director of Naval Weather Service Department of the Director of Personal Services Department of the Director of Physical Training and Sports Department of the Director of Torpedoes and Mining Department of the Director of Transports Department of the Director of Underwater Weapons Department of the Director of Underwater Weapons Materials Department of the Director of Unexploded Bombs Department of the Director of Warship Production Department of the Director of Welfare and Service Conditions Department of the Director of Wreck Dispersal Department of the Flag Officer Sea Training Department of the Engineer in Chief Department of the Paymaster Director-General Department of the Inspector of Anti-Aircraft Weapons Department of the Inspector of Dockyard Expense Accounts Department of the Inspector-General of Naval Hospitals and Fleets Department of the Medical Director-General of the Navy Department of the Physician of the Navy Department of the Physician General of the Navy Department of the Storekeeper-General of the Navy Department of the Surveyor of Buildings Department of the Surveyor of Dockyards Directorate-General, (Naval Manpower and Training) Directorate General Training Dockyards and Fleet Maintenance Department Dockyards Branch Dockyard Expense Accounts Department Dockyard Schools Electrical Engineering Department Engineer Branch Engineering Department Experimental Department Fire Control Group Greenwich Hospital Department Inspector of Telegraphs Inspector of Repairs Joint Warfare Establishment Medical Consultative Board Medical Examining Board Historical Section Hydrographic Department Marine Department Marine Pay Department Materials and Priority Department Medical Consultative Board Medical Department Medical Examining Board Movements Department Nautical Almanac Office Naval Artillery and Torpedo Department Naval Engineering College Naval Equipment Department Naval Historical Branch Naval Construction Department Naval Intelligence Department Naval Medical Service Naval Law Division Naval Manpower Department Naval Mobilisation Department Naval Ordnance Department Naval Ordnance Inspection Department Naval Ordnance Stores Department Naval Personnel Services and Officer Appointments Department Naval Publicity Department Naval Regional Offices Naval Reserve Department Naval Security Department Naval Stores Department Naval Training Department Naval Works Department Navy, Army and Air Force Institute Navy and Army Canteen Board Navy Works Department Navigation Department Observatory at the Cape of Good Hope Office of the Admiral Commanding Coast Guard and Reserves Office of the Admiral Commanding, Reserves Office of the Admiralty Chemist Office of the Adviser on the Naval Construction to the Board of Admiralty Office of the Assistant Controller Office of the Assistant Controller Research and Development Office of the Clerk of the Journals Office of the Chief Polaris Executive Office of the Deputy Controller of Navy Office of the Deputy Controller Production Office of Extra Naval Assistant to Second Sea Lord Office of the Inspector Gun Mountings Office of the Keeper of Records Office of the Senior Psychologist (Naval) Office of the Senior Psychologist of the Navy Office of the Translator of French and Spanish Languages Office of the Vice Controller Air Office of the Vice Controller of the Navy Organisation and Methods Department Packet Service Regional Organisation for Merchant Shipbuilding and Repairs Royal Corps of Naval Constructors Royal Flying Corps Royal Marine Police Royal Marines Office Office of the Chaplain of the Fleet Royal Naval Academy Royal Naval Aircraft Workshops Royal Naval Air Service Royal Naval Air Stations Royal Naval Armaments Depot Royal Naval Auxiliary Service Royal Naval Cordite Factories Royal Naval Propellant Factory Royal Naval College Royal Naval College and the School for Naval Architecture Royal Naval College, Dartmouth Royal Naval College, Greenwich Royal Naval College, Keyham Royal Naval College, Osborne Royal Naval Engineering College Royal Naval Film Corporation Royal Naval Hospital Royal Naval Medical Depot Royal Naval Minewatching Service Royal Naval Mine Depot Royal Naval Patrol Service Royal Naval Scientific Service Royal Naval Sick Quarters Royal Naval Torpedo Depot Royal Naval Volunteer Reserve Royal Naval War College Royal Naval War College, Portsmouth Royal Navy Dockyard Royal Navy Medical Service Royal Navy Shore Signal Service Royal Observatory, Greenwich Royal School of Naval Architecture Salvage Department School of Mathematics and Naval Construction Scientific Research and Experiment Department Sea Transport Branch Sea Transport Department Sea Transport Division Ship Department Ship Design Department Signal Department Signal School Sixpenny Office Statistics Department Steam Department Superintendent of De-magnetisation Torpedo Experimental Establishment Transport Department Undersurface Warfare Department Victualling Department Volunteer Boys and Cadet Corps Weapons Department Weapons Department (Naval) Women's Royal Naval Service Wireless Telegraphy Board Direction/Command of the Fleet Naval formations after 1707
1st Fleet 2nd Fleet 3rd Fleet Commander-in-Chief, Africa Atlantic Fleet Commodore, Arabian Seas and Persian Gulf Australia Station Cape of Good Hope Station Cape and West Africa Station Battle Cruiser Fleet Battle Cruiser Force Caspian Flotilla Channel Fleet Channel Squadron Commander-in-Chief, Coast of Ireland Cork Station Coast of Scotland Commander-in-Chief, China Commander-in-Chief, Dover Flag Officer, East Africa East Indies Station East Indies and China Station Eastern Fleet Far East Fleet English Channel Grand Fleet Flag Officer Gibraltar Harwich Force Home Fleet Jamaica Station Leith Station Commander-in-Chief, Levant Levant and East Mediterranean Commander-in-Chief, Leeward Islands Mediterranean Fleet Medway Newfoundland Station New Zealand Division New Zealand Naval Forces Nore North America and West Indies Station Commander-in-Chief, North Sea Admiral Commanding, Orkneys and Shetlands Pacific Fleet Pacific Station Admiral of Patrols Commander-in-Chief, Plymouth Commander-in-Chief, Portsmouth Queenstown Station Royal East African Navy Royal Indian Navy Flag Officer Submarines Commander-in-Chief, Rosyth Reserve Fleet Scotland and Northern Ireland Commander-in-Chief, South Atlantic South East Coast of America Station Commander-in-Chief, Thames and Medway West Africa Squadron Flag Officer, West Africa Commander-in-Chief, Western Approaches Naval formations before 1707 Direction of Naval Finance Departments under the Direction of Naval Administration Branches and offices under the Civil Administration Departments under the Legal
