HAWKER (H. G.) Australian subject. On October 24th made British duration record to date--8 hours 23 mins. in _Sopwith_ biplane. Awarded the Michelin Cup, 1912. HEKKING (R.) Frenchman. In September, 1909, carried out experiments with a biplane glider of 7 m. span and 25 m squared. surface. He rose to a height of 25 m., and is stated to have remained stationary for 5 minutes. Not confirmed, however. HELEN. French aviator. Has appeared in various competitions since early in 1911. HENDERSON (Brig. Gen.) British Army. First general to obtain British R. Ae. C. aviator certificate. Flying under the name of "Davidson" he obtained his certificate on a _Bristol_, at Brooklands, after seven days' training. HENRY, Prince of Prussia. Well known for practical interest in motoring and aviation. Has driven his own car in races, and is a certificated aerial pilot for Germany. HENSON. Died 1842. Projected a steam-driven monoplane early in the XIX century. HERRING (A. M.), Freeport, Long Island, U.S.A. Started the study of aviation 1894. With Langley, 1895. With Chanute, 1896. Joined Ae. Exp. Assoc. and associated with Curtiss in the _Herring-Curtiss_. Subsequently (1910) with Burgess in the _Herring-Burgess_. HERVE (Henri), 1 Rue Hautefeuille, Paris. Well-known authority on matters aeronautical. Author, etc. HEWLETT (Mrs. Maurice) ("Madame Franck"). First lady aviator to obtain a British R. Ae. C. certificate. HILDEBRAND (Kapitan Alfred), 10 Martin-Lutherstrasse, Berlin W. 30. Retired from German Army. A very well-known aeronaut. Owner of a Baldwin dirigible. Author of many works on aeronautics and aviation--the best known German writer on these subjects. HINTERSTOISSER (Hauptmann Franz), Luisenstrasse 35, Vienna V. Commanding Austro-Hungarian Aeronautical service. 1911-12. HIRTH (Helmuth). German. Made German passenger altitude record to date, at Johannistal, September-October, 1911. Height 2475 metres. Many other records. The best known of all German aviators. HOFFMAN (Joseph). German. Built a steam-driven aeroplane in 1906. HOLDEN (Col. H. C. L.) R.A.F.R.S. Prominent supporter of aviation. Member of the R. Ae. C. Committee, 1910-11. HOWARD-FLANDERS. See British Aeroplanes, Part A. HOWARD-WRIGHT. British. Early designer (_see_ Part B). In January, 1913, became manager of S. White & Co., of Cowes. HOUDINI (Harry). British. The famous "Handcuff King" flew a _Voisin_ so long ago as November 2nd, 1909. He took it to Australia and won the first aeroplane flight prize there. He is the first to have taken out a "third party" insurance, which he did with the Albingia-Versicherungs-Aktien-gesellschaft, Hamburg, Germany, on November 29th, 1909. The policy was for 150,000 marks. HUBERT. French aviator. Flew in the first British aerial post and was badly injured.