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Orlandi Hybrid hot-air/hydrogen Balloon
 Francesco Orlandi, the most successful with hybrid hot-air/hydrogen type of aerostat, published a treatise on ballooning, suggesting this new design, in 1800. His first flight did not occur until August 30, 1825 after which he made 40 flights. Despite the death in June 1785 of Pilatre de Rozier and Jules Romain in their combination hot-air and hydrogen balloon, experimenters continued to build balloons that combined these elements. The aeronaut Francis Olivari lost his life in one on November 25, 1802, at Orleans, as did Francesco Zambeccari on September 21, 1812, near Boulogne.
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