Clement Ader may have been the first. The French certainly think so. He was supposed to have taken off, flown for about 120 feet and landed in L'Eole, all under its own steam - literally, it was steam-powered - in France in 1890. A replica of Ader's Avion lll, similar to but larger than L'Eole, hangs in the Musee des Arts et Metiers in Paris, with a replica of its steam engine on separate display. Henri Farman flew the first closed-circuit kilometer (all previous powered flights, anywhere, had apparently merely been hops in a straight line) demonstrating for the first time mastery of heavier-than-air flight, on 13 January 1908 in an aircraft designed and built by Gabriel Voisin, who had also taught Farman to fly and swung the prop for him.