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Updated: June 23, 2025
And as the capacity of the "Go-Ahead" was 40,000 cubic meters, the ascensional power of the gas she contained was 40,000 multiplied by 1,100 or 44,000 kilograms. On this 29th of April everything was ready. Since eleven o'clock the enormous aerostat had been floating a few feet from the ground ready to rise in mid-air.
Ordinary lighting gas possesses an elevating force of about 700 grams for every cubic meter. But hydrogen possesses an ascensional force estimated at 1,100 grams per cubic meter. Pure hydrogen prepared according to the method of the celebrated Henry Gifford filled the enormous balloon.
By the utmost good fortune after we passed the blazing peak which so nearly wrecked us, we were carried on by the wind so far, before the ascensional power of the car gave out, that we descended on the sunward side of the crest of the range. The sun is now just beginning to rise on the part of the strip where we are, and it will get higher for several weeks to come.
It seemed perfectly motionless, and, consequently, the travellers knew that it must be animated by the same ascensional movement as themselves. "What on earth can such a consarn be, Barbican?" asked Ardan, who every now and then liked to ventilate his stock of American slang.
This is far in excess of the ascensional speed of even the speediest aeroplane, of course, the penalty for such a factor has to be paid: the loss of gas is appreciable and may lead to the craft's ultimate undoing. At the same time, however, it is able to maintain the superior position as compared with the aeroplane for a considerable period: the upper reaches of the air are its sanctuary.
The thread has not reached the platform; it floats, it is fixed only at the lower end. As long as it is of a fair length, it is able, although moving, to bear the minute animal's weight. But, as the Spider climbs, the float becomes shorter in proportion; and the time comes when a balance is struck between the ascensional force of the thread and the weight carried.
But if this should not be the case, a comparatively thin place in the ice will be chosen, and a great opening blown through it by means of an ascensional shell, several of which she will carry. She will then rise to the surface of the water in this opening, and the necessary operations will be carried on." "Mr. Clewe," said Margaret Raleigh, "the thing is so terrible I cannot bear to think of it.
But probably the work done by the machines would be very much less than that done by the machines of the "Albatross." The "Go-Ahead" had been taken to the clearing in Fairmount Park, to the very spot where the aeronef had landed for a few hours. Her ascensional power was due to the very lightest of gaseous bodies.
Throw out the remainder of the ballast. The balloon regained its ascensional force, but soon re-descended. About midway of the voyage, the aeronauts threw out their books and tools. A quarter of an hour afterwards, Blanchard said to Jefferies: 'The barometer? 'It is rising! We are lost; and yet there are the shores of France! A great noise was heard. 'Is the balloon rent? asked Jefferies.
Two days later, having repaired the balloon, he made an ascent of 1,300 feet. In descending, the hydrogen left in the balloon contracted, and Santos-Dumont narrowly escaped a serious accident in coming to the ground. His second machine, built in the early spring of 1899, held over 7,000 cubic feet of gas and gave a further 44 lbs. of ascensional force.
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