EditorialThe "Comte d'Artois" balloon with propellers built by chemical factory directors Leonard Alban and Vallet of Javel, August 1785. Woodblock engraving from Louis Figuier's "Les Merveilles de la Science: Aerostats" (Marvels of Science: Air Balloons), Furn...
EditorialThe "Comte d'Artois" balloon with propellers built by chemical factory directors Leonard Alban and Vallet of Javel, August 1785. Woodblock engraving from Louis Figuier's "Les Merveilles de la Science: Aerostats" (Marvels of Science: Air Balloons), Furn...