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Updated: June 26, 2025
Two small knives served them for tools, with which they dug through the floors of their cells, composed of cement and nine inches of brickwork, and in this way reached an air-chamber below. They had now only to dig through the soft earth under the foundation walls of the penitentiary and open a passage into the yard.
But so carefully is this sort of work done that such an accident rarely occurs, and the caissons are sunk till they rest on bed-rock or permanent, solid ground, far below the scouring effect of currents and tides. Then the air-chamber is filled with concrete and left to support the great towers that pierce the sky above the waters.
His idea of a house was a brown-stone front, four stories high, and a French roof with an air-chamber above. Inside, there was to be a reception-room on the street and a dining-room back. The parlours were to be on the second floor, and finished in black walnut or party-coloured paint. The chambers were to be on the three floors above, front and rear, with side-rooms over the front door.
In another hour or so the Astronef had dropped gently on to the surface of Calisto at the foot of a range of mountains crowded with jagged and splintery peaks, and a mile or two from the edge of a sea of snow and ice which stretched away in a vast expanse of rugged frozen billows beyond the horizon. Redgrave, as usual, went into the air-chamber and tried the atmosphere.
The cabin or air-chamber of men in model, who are let down to work for him, suggests that Egyptians may have used the principle of a diving-bell or air-chamber for reaching parts under water. Certainly the device of raising things by dropping down sand to be put under them is still practised.
It consists of a very long fine coil of silk-covered copper wire, and in the heart of the coil, within a little air-chamber, a small round mirror, having four tiny magnets cemented to its back, is hung, by a single fibre of floss silk no thicker than a spider's line. The mirror is of film glass silvered, the magnets of hair-spring, and both together sometimes weigh only one-tenth of a grain.
A hideous experience while it lasted, those vicious currents dragging the aerostat upward out of the air-chamber by means of grapnel and rope, then casting all far away in company with wrecked trees and bushes, and even solider materials, all shrouded for a time in dust and debris, which hindered the eyesight of both uncle and nephews.
Way back in the glacial days, thousands of years ago, it broke off from the mainland; and by some curious accident the inside of it, which is hollow, got filled with air as it fell into the ocean. You can only see less than half of the island: the bigger half is under water. And in the middle of it, underneath, is a huge rock air-chamber, running right up inside the mountains.
Here we came to the air-chamber, as I had calculated, and found it six feet wide by four feet high, and running the entire length of the range of cells. The cement and brick taken out in effecting an entrance to the chamber were placed in my bed-tick, upon which I slept during the progress of this portion of the work, after which the material was removed to the chamber.
They seem to have pneumatic feet and legs, for their motion was certainly not produced like that of frogs." When the party came up with them the heads again began to swell. "I will perforate the air-chamber of one," said Col. Bearwarden, withdrawing the explosive cartridge from the barrel of his rifle and substituting one with a solid ball.
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