impossible! Now I am used to it I expect it. But in those days it troubled me. Still I persevered.

They showed me that for a balloon to have "stability" it must have a certain weight. Again, a balloon of 100 cubic metres, they said, would be affected by the movements of the aeronaut in his basket much more than a large balloon of regulation size.

With a large balloon the centre of gravity

in the weight of the aeronaut is as in Fig. 1, a. When the aeronaut moves, say, to the right