Group of stereoview photographs documenting large public balloon demonstrations and ascensions attended by crowds of spectators. The images show enormous spherical gas balloons being inflated and prepared for launch in public squares and open areas, surrounded by thousands of onlookers. Several stereographs capture the balloon rising above dense crowds gathered before large buildings and civic structures. Other views depict the balloon resting on the ground while attendants manage the ropes and equipment prior to ascension. The stereoscopic format emphasizes the massive scale of the balloon envelopes and the dense crowds assembled to watch the spectacle. Balloon exhibitions were among the most dramatic public entertainments of the nineteenth century, combining scientific curiosity with popular spectacle. These stereographs document the excitement surrounding early aeronautical demonstrations and the large audiences they drew in cities across the United States.