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Concours sur le meilleur moyen d'élever un ballon sans perte de gaz de...
Design drawing shows proposal by Louis Panafieu in which the operator in an open car attached to the balloon achieves lift without loss of gas in ballast by manipulating cords on underside of the balloon. Inclu... More
Projet de Louis Panafieu. - Public domain portrait drawing
Picryl description: Public domain illustrated book page scan, drawings, free to use art, no copyright restrictions image.