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.
Adolphe Regnier Adolphe or Jacques-Auguste-Adolphe Regnier (7 July 1804, Mainz - 20 October 1884, Fontainebleau) was a French philologist. He is most notable as a professor at the collège de France (1804 – 1884) and for his numerous translations of the poems and plays of the German author Friedrich Schiller.