Early flying machines a second, inner ballonet. On 19 September 1784, it completed the first flight of over , between Paris and Beuvry, despite the man-powered propulsive devices proving useless. In January the next year Jean Pierre Blanchard and John Jeffries crossed the English Channel from Dover to the Bois de Felmores in a Charlière. But a similar attempt the other way ended in tragedy. In an attempt to provide both endurance and controllability, de Rozier developed a balloon with both hot air and hydrogen gas bags, a design which was soon named after him as the "Rozière." His idea was to use
John Sheldon (anatomist) October. It carried scientific instruments, but failed to ascend: Blanchard threw instruments overboard. They landed at Sunbury-on-Thames, and quarrelled, with Blanchard carrying on the flight alone. With John Jeffries, Sheldon then tried to have the Royal Society support more balloon ascents, but without success. Sheldon spent time in studying the lymphatic system, an area on which William Cumberland Cruikshank also was working. He devoted attention to embalming, too. Both interests came from William Hunter's inspiration, and were lifelong. Sheldon had a celebrated body of a young woman embalmed: there are differing accounts. It was that of a patient who had