Who was the French professor that the Robert brothers built the world's first hydrogen balloon for?
Robert brothers Les Frères Robert were two French brothers. Anne-Jean Robert (1758–1820) and Nicolas-Louis Robert (1760–1820) were the engineers who built the world's first hydrogen balloon for professor Jacques Charles; which flew from central Paris on August 27, 1783. They went on to build the world's first manned hydrogen balloon, and on 1 December 1783 Nicolas-Louis accompanied Jacques Charles on a 2-hour, 5-minute flight. Their barometer and thermometer made it the first balloon flight to provide meteorological measurements of the atmosphere above the Earth's surface.
André Rouillé André Rouillé ( fr.. "André Rouillé", born in 1948 in France) – historian and theorist of photography, professor at University Paris 8, author of a significant number of books on photography and contemporary art, founder and editor-in-chief of www.paris-art.com, the first French website devoted to contemporary culture.