Show Hot-Air Hot Bags The hot-air hot balloon first device devic e to carry man from the ground in i free flight is staging a n comeback come come- back Two Austrian inventors inventor s have built such a balloon which h has ascended feet The air in the balloon is heated d by an intense kerosene flame N No do o gas such as hydrogen or helium is necessary The lifting Jilting is don done e entirely by hot dir air No ballast i is s needed The balloon may be mad made e eo to ascend by turning up the kerosene kerosene kero kero- o ey sene acne flame and to descend b by y turning it down Washington Washingto n Post |