Publisher's Synopsis
Excerpt from The Boy's Book of Airships
These brothers, by making tests With small globes, had discovered that a vessel of this shape, if filled with hot vapour, would rise in the air, the hot vapour being lighter than air itself, and possessing sufficient buoyancy to cause the light hollow ball to ?oat gradually upwards.
Strange as it may seem to us at the present time, this idea was entirely novel in the year I 783, to which I am now referring, and the Spectators who assembled in the public square of Annonay on the 5th of June of this year, were immensely surprised at seeing a huge ball, about 110 feet in circumference, or 35 feet in diam eter, attached at its base to a wooden frame or platform, and even more astonished when the inventors announced that, as soon as it was filled with hot air, it would rise of itself into the Clouds.
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