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Papers of Ivor Bowen, 1926-1973, relating to his career in aeronautics, comprising manuscript volume entitled 'Bomb and Bombsight figures'; photographs, some captioned, relating to a long haul flight to Singapore, 1946, including exterior and interior details of plane and an aerial view of Singapore; Air Ministry Laboratory report, 'Bomb ballistics experiments, Orfordness, 1926', written by L C Bygrave and Ivor Bowen, including aerial photographs, photographs of recording equipment, bomb at moment of release, cine film stills of explosion, detailed technical drawings of recording equipment and periscopic bomb sight, and graphs of time lags, trail angles and fall times of bombs; publications relating to aeronautics including Air Ministry manuals, chiefly on air navigation, 1926-1941; typescript draft handbook, 'Aircraft compass installations', by C S Hudson, for publication by HMSO, [1949]; patents issued to General Precision Laboratory, USA, 1956-1959; lecture text, 'The development of visual landing for flight simulators' by G M Hellings, Chief Scientist, General Precision Systems Ltd, Oct 1961; technical product descriptions including for Miniature Inertial Navigation System (MINS), produced by Kearfott Division, USA and Kearfott C702519001 floated rate-integrating gyro, Aug 1962; performance data for floated rate-integrating gyro King II, produced by Kearfott Division, USA, Dec 1962; offprint articles on aeronautics, 1962; memoranda and minutes of meetings of the Air League, 1963-1973; 'Unservile State Papers, no 15: A Defence for Britain' by Anthony Paice, Liberal Publication Dept, [1966]; letter from I J Bettison, General Equipments Ltd, Adelaide, Australia, 3 Jun 1963, on selling flight simulation training systems; and 'extracts from the technical supplement to the annual report of the Aeronautical Research Council', 1 Apr 1965.