Montgolfier brothers filled balloon he had developed. In early 1784, the Flesselles balloon, named after the unfortunate Jacques de Flesselles, later to be an early casualty at the Bastille, gave a rough landing to its passengers. In June 1784, the Gustave (a hot air balloon christened La Gustave in honour of King Gustav III of Sweden's visit to Lyon ) saw the first (singing) female aeronaut, Élisabeth Thible. Both brothers invented a process to manufacture transparent paper looking like vellum, reproducing the technique of the English, followed by the papermakers Johannot and Réveillon. In 1796, Joseph Michel Montgolfier invented the first self-acting
Hot air ballooning forecasts. The pilot will also send up a helium pilot balloon, known as a "met-balloon" in the UK and "pibal" in the USA, prior to launch to get information about what the wind is actually doing. Another way to determine actual wind directions is to watch other hot air balloons, which are the equivalent of a large "met-balloon". The direction of flight depends on the wind, but the altitude of the balloon can be controlled by changing the temperature of the air inside the envelope. The pilot may open one or more burner blast valves to increase the temperature inside