Nicholas Roosevelt (inventor) 74-gun ships. In 1797, with Robert R. Livingston and John Stevens, he agreed to build a boat on joint account, for which the engines were to be constructed by Roosevelt, and the propelling agency was to be that planned by Livingston. The experiment failed, the speed attained being only equivalent to about in still water. On September 6, 1798, Roosevelt described and earnestly recommended to Livingston a vertical wheel, which is the first practical suggestion of the combination that made steam navigation a commercial success, although four years later Robert Fulton believed that chains and floats were alone to be
Claims to the first powered flight its twin steam engines. Several years later in 1906, following Blériot's first successful flights Ader claimed publicly that his "Éole" had flown for 330 ft (100 m) in 1891, and that the "Avion III" had flown for 1,000 ft on the second day of its trials. Ader's claim for the "Avion III" was refuted four years later in 1910, when the French Ministry for War finally published its report on his work. His claim for the "Éole" also collapsed through lack of credibility. When Gustav Weisskopf immigrated to the United States he changed his name to Gustave Whitehead. There he