Montgolfier hot air balloon, 1783

Montgolfier hot air balloon, 1783

Joseph-Michel Montgolfier (August 26, 1740 - June 26, 1810) and Jacques-Étienne Montgolfier (January 6, 1745 - August 2, 1799) were the inventors of the Montgolfière-style hot air balloon, globe aérostatique. On June 4, 1783, they flew their craft in front of a group of dignitaries. Its flight covered 1.2 miles, lasted 10 minutes, and had an estimated altitude of 5,200-6,600 ft. The brothers succeeded in launching the first manned ascent, when Étienne made a tethered flight on October 15, 1783. Later, in December 1783, in recognition of their achievement, their father Pierre was elevated to the nobility and the hereditary appellation of de Montgolfier by King Louis XVI of France. At the time, the brothers believed they had discovered a new gas. However, in 1785, the buoyancy was shown to be caused by heated air, which is less dense than the surrounding atmosphere. The two brothers were honored by the French Académie des Sciences. During their careers, they published books on aeronautics, Joseph invented a calorimeter and the hydraulic ram, and Étienne developed a process for manufacturing vellum. Étienne died in 1799 at the age of 54. Joseph died in 1810 at the age of 69.

Album / Science Source / New York Public Library

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3386 x 4888 px | 47.4 MB

28.7 x 41.4 cm | 11.3 x 16.3 in (300 dpi)