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"Yes, as soon as I saw that our screens were not going to hold." The Osnomians' labored breathing became normal as the air-pressure increased to a value only a little below that of the dense atmosphere of their native planet. "I then increased the power of the screens to the extreme limit and opened the zone for a moment to see how the screens would hold with the added power.
At the bases of the wings lie their nerves. The fore-wings each have a heavy rib running from the base and gradually decreasing to the tip. This is called the costa. Its purpose is to bear the brunt of air-pressure in flight.
Several of them had been blown as far as ten yards by the air-pressure of exploding shells and had been buried in the scatter of earth. "When at last my men came back those of them who had received the order," said the colonel, "I knew the price of their achievement its cost in officers and men." He spoke as a man resentful of that bloody sacrifice.
"Pressure, thirty pounds per square inch. Surface gravity as compared to that of the Earth, two-fifths. Air-pressure about double that of the Earth, while a five-pound weight weighs only two pounds.
Fearing lest the enormous air-pressure should break the planes if he strove to fly in the teeth of the wind, he decided to swing round and run before it for a time, in the hope that it would drop by and by.
The first three would be, when the earth assumed anything like its present conditions of temperature and air-pressure, invisible gases, as they are at present; the fourth is a substance which forms the basis of charcoal, and which we see in a nearly pure form crystallized in the diamond.
Now, if you push this little pellet one way by the air-pressure from your mouth, and then, instead of reversing the tube in the mouth and pushing it back again in the same way, reverse the process and suck the air out from behind it, it comes back by the pressure of the outside atmosphere. This was the way the first steam engines worked.
But now you must imagine that the tube is fixed immovably, and that the air-pressure is constant in a pipe leading to the tube, and yet must be admitted first to one end of the tube and then to the other alternately, in order to push the pellet back and forth in it. It seems simple.
The index hands of both dials were travelling backwards towards zero along their respective graduated arcs; and simultaneously with the registration by the pressure gauge of a pressure of six pounds which indicated the air-pressure in the air-chambers of the ship the other dial registered zero, thus indicating that the partial exhaustion of the air in the air-chambers had rendered the ship so buoyant that she was now deprived of weight and was upon the point of floating upward, balloon-like, in the air.
Arrived at the surface, Seaton moistened a rod in a wave, and tasted it cautiously, then uttered a yell of joy a yell broken off abruptly as he heard the sound of his own voice. Both girls started as the vibrations set up in the dense air smote upon their eardrums. Seaton moderated his voice and continued: "I forgot about the air-pressure.
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