Translations:AY Honors/Hot Air Balloons/Answer Key/4/en

Of the two brothers, it was Joseph who first contemplated building "machines". Joseph observed laundry drying over a fire incidentally form pockets that billowed upwards. Joseph set about building a box-like chamber 1 by 1 by 1.3 meters out of very thin wood and covering the sides and top with lightweight taffeta cloth. Under the bottom of the box he crumpled and lit some paper. The contraption quickly lifted off its stand and collided with the ceiling. Joseph then recruited his brother to balloon building.