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Show Hot-Air Bags The hot-air balloon, first device to carry man from the ground in free flight, is staging a comeback. come-back. Two Austrian Inventors have built such a balloon which has ascended 6,560 feet. JThe air in the balloon Is heated by an intense kerosene flame. No gas, such as hydrogen or helium, is necessary. The lifting is done entirely by hot air. No ballast is needed. The balloon may be made to ascend by turning up the kerosene kero-sene flame, and to descend by turning it down. Washington Post., |