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Look, look! A star!" The girl was first to see that blest and wondrous thing. Hours had passed, long, weary hours; steadily the air-pressure had sunk, the vapors thinned; but light had not yet filtered through the mists. And Allan's mind had been sore troubled thereat. He had not thought of the simple reason that they were reaching the surface at night.
Her little fingers never loosened their grip of the padded leather. Wisps of her brown hair, caught in the terrific air-pressure, stood back from her head like small pennants. Black Ridge they passed, and it looked squatty and insignificant.
Under normal conditions a steep dive imparts a feeling of being hemmed in from every side. One takes a deep breath instinctively, and the novice to flying will grip the fuselage, as if to avoid being crushed. And, indeed, a passenger in a diving aeroplane is hemmed in, by the terrific air-pressure to which the solid surface is subjected.
Even when the cover was replaced and the tire pumped to the proper degree of air-pressure he lit a cigarette and had a look at the magneto before restarting the engine. Two small boys had appeared from space, and he amused himself by asking them to reckon how long it would take two men to mow a field of grass which one of the men could mow in three days and the other in four.
When raised the steam was cut off, and all that was then under the piston was condensed by a jet of cold water. The outside air-pressure then acted upon it and pushed it down again. In this down-stroke by air-pressure the work was done. The far end of the walking-beam was even counter-weighted to help the steam-pressure.
And when the water is all out, we turn off the stream of compressed air, and open this valve, which allows the compressed air to pass into the habitable portion of the ship, quickly reducing the air-pressure in this room to what it is in the other habitable portion of the ship; then we open this door, and pass into the diving-room."
The 82-foot-drop stunts were done with each of the crew at his station, ready at any instant to check her. To meet the further requirements our sub had to rise to the top, fill her tanks, let herself go, and then, by an automatic safety device, fetch up all by herself. So the tank man applied the air-pressure, blew his tanks free of all water, closed his outer valves and brought her up.
The pellet will now move toward that end of the tube which is open. Reverse the process, and it can be pushed back again with air-pressure to the other end, and so on indefinitely. Let us improve the process. We will close each end of the tube permanently, and insert four cocks in the tube and forked pipe.
They were letting the ship's air-pressure into this lock. Soon they would open the inner panel, step into the secondary chamber and in a moment more would be within the ship's hull corridor. Anita, lost to me! The outer panel suddenly opened! I had lunged against it with my shoulder; the giant figure inside slid it. It was taken by surprise! I half fell forward. Huge arms went around me.
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