Hence the surface of the outside balloon being about eleven thousand six hundred square feet, its envelope weighed six hundred and fifty pounds.
The consumption of these articles would necessarily, little by little, diminish the weight to be sustained, for it must be remembered that the equilibrium of a balloon floating in the atmosphere is extremely sensitive.
But the management of two balloons would, necessarily, be very difficult, in view of the problem how to keep them both at an equal ascensional force.
The balloons were made of a strong but light Lyons silk, coated with gutta percha.
went the ropes, and the balloon
rose into the air without her.
The balloon is furnished besides with a grapnel, and a guide-rope ; which latter is of the most indispensable importance.
As soon as the balloon quits the earth, it is subjected to the influence of many circumstances tending to create a difference in its weight ; augmenting or diminishing its ascending power.
It is merely a very long rope which is suffered to trail from the car, and the effect of which is to prevent the balloon from changing its level in any material degree.
Osborne's seat, about a mile from Penstruthal, in North Wales ; and at 7 minutes past 11, every thing being ready for departure, the balloon was set free, rising gently but steadily, in a direction nearly South ; no use being made, for the first half hour, of either the screw or the rudder.
The balloon was unusually steady, and looked beautifully.
But as the day wore on and the gas diffused slowly from the balloon, it sank earthward again, details increased, men became more visible, and he began to hear the whistle and moan of trains and cars, sounds of cattle, bugles and kettle drums, and presently even men's voices.
A balloon should come down in an empty open space, and he chose a crowd.
The balloon leapt at once, in the manner of balloons when part of their weight is released by touching down, with a sort of flippancy, and in another moment Bert was over a street crowded with peasants and soldiers, that opened into a busy market-square.
The balloon rolled nauseatingly, and the car pitched.
With an immense and horrifying rustle the balloon brushed against a telephone pole, and for a tense instant he anticipated either an electric explosion or a bursting of the oiled silk, or both.