The Montgolfier Brothers were named Joseph and Jacques. The sons of a paper bag manufactuer at Annonay, France, when playing with inverted paper bags over an open fire, found that the bags rose to the ceiling. This led them to experiment further with larger bags made of other silk and linen. On December 14, 1782 they succeded in an outdoor launch of a silk bag, which reached an altitude of 250 meters. This was their first true balloon. On June 5, 1783 as a first public demonstration, they sent up at Annonay, a linen bag inflated with hot air. Its flight covered 2 km. and lasted 10 min. Only one of the brothers ever flew himself in a balloon, and only once.