From the 18th century, people have been inflating balloons of fabric or canvas with very hot air and sending it aloft, the Montgolfier brothers likely as far as to experiment with initial animals in 1782, and afterwards, when altitude didn't destroy them, human beings in 1783. Se non riesci a https://balloonarchframe08642.wikiconversation.com/7444102/a_review_of_balloon_arch_frame