3061423 France: Early Flight - \'Traversee en ballon du Pas-de-Calais par Blanchard et Jefferies, 1785\' (Crossing of the Strait of Dover by Blanchard and Jefferies, 1785), 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.