National Geographic : 1936 Jan
ACTION PHOTOGRAPHS OF THE BALLOON'S PERFECT LANDING Photograph by Richard H. Stewart and Captain James Haizlip GAS ESCAPES, AND, LIKE AN EMPTY SACK, THE BAG FALLS TO EARTH The smokelike cloud rising from the opened bag is soapstone dust shaken from the fabric and car ried upward by the escaping helium. The rubberized cloth of the bag was treated with this powder to pre vent its folds from sticking. Helium gas is nonexplosive and invisible. So gently did the gondola come down on the ground that the doughnut-shaped, inflated bumper (clearly visible as a white circle on the car) did not burst.