The Air Ship Boys (Hardcover)

At the first bubble of gas the boys felt like doing another war dance. But they were "business men" now and had to put on dignity in the face of their employees. In two hours the reaction of the bubbling acid had sent enough hydrogen through the purifier to raise the bag shoulder-high and everything was going splendidly. The boys had removed their working clothes and were now in the light but warm canvas suits and caps they meant to wear in their flight.