3061388 France: Early Flight - \'Gay-Lussac et Biot a 4 000 metres de Hauteur, 1804\' (Gay-Lussac and Biot at an altitude of 4000 metres, 1804), Paris, Romanet, c. 1895; (add.info.: A balloon is conceptually the simplest of all flying machines. The balloon is a fabric envelope filled with a gas that is lighter than the surrounding atmosphere. As the entire balloon is less dense than its surroundings, it rises, taking along with it a basket, attached underneath, which carries passengers or payload. Although a balloon has no propulsion system, a degree of directional control is possible through making the balloon rise or sink in altitude to find favorable wind directions.); Pictures from History.