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Updated: June 25, 2025
By means of plates constructed for the purpose, place the other foot and hand under the receivers of two air-pumps. Exhaust the receivers. Exhibit a pint of French brandy, and await the result. "'Which would presently arrive in the form of grim Death, said Kopy-Keck. "'If it should, she would yet die in doing our duty, retorted Hum-Drum.
"Set a-goin' the air-pumps up there," shouted Rooney, from whose face the perspiration flowed freely, as much from anxiety about his friend as from prolonged exertion in a constrained attitude. In a few seconds the air came hissing into the helmet, showing that the two men who wrought it were equal to their duty, though inexperienced. "All right?" asked Rooney a second time.
Thus he stood for full ten minutes, and then opening the escape-valve, signalled for more air. This was a sufficient evidence that a man might have ample time to return to the surface from great depths, even if the air-pumps should break down. "But, perhaps," said Edgar, as they conversed on the subject, "you might not be able to hold out so long under water where the pressure would be great."
By the last decade of the century the theory was confidently advanced notably by Lorentz and Larmor though it was still without a positive basis. How the basis was found, in the last decade of the nineteenth century, may be told very briefly. Sir William Crookes had in 1874 applied himself to the task of creating something more nearly like a vacuum than the old air-pumps afforded.
It's dreadful stuff to dig amongst slides in on you as soon as you start to dig, and levels up. They'll have to brattice as they work. It'll be a big job." All that day Kettle watched the sea with an anxious eye. In the two boats men ground at the air-pumps under the aching sunlight.
Then the main air-pumps were set to work, forcing compressed air into the vacuum chambers, and causing the ship to sink very gradually in the water, while at the same time, to facilitate the operation of sinking, water was admitted into certain of the ballast chambers in the ship's bottom until she floated at her ordinary trim for cruising on the surface of the sea that is to say, with the whole of her immense propeller completely submerged, and her conical-pointed bow buried to the depth of a foot or so.
Some ten minutes later Jack and Milsom appeared on deck, each attired in an improved Fleuss diving dress, by the use of which the necessity for air-pumps and pipes was done away with.
But in 1844 Faraday returned to them, armed now with new weapons, in the way of better air-pumps and colder freezing mixtures, which the labors of other workers, chiefly Thilorier, Mitchell, and Natterer, had made available.
The two long silver pipes were left protruding. Now, for the first time, Billie saw where they led to. On a stand alongisde the operating-table stood an extremely small, flat box, with its lid open. The pipes ended there. And as the surgeon inspected the outfit Billie saw that it comprised, in effect, a pair of diminutive air-pumps.
To crawl across slanted gratings and down weedy ladders, while air-pipe and signal-line trailed about the machinery, was horribly dangerous, but he kept it up, although he got slacker and felt his pluck was breaking. Then one afternoon he knew he could not go down again, and he stayed under water long. Brown, standing by the air-pumps, looked at his watch and waited anxiously.
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