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Updated: June 22, 2025
The principal point to be guarded is the thickness of the walls of the cone, and uniform heating. A thin place or a hot place will give way under the air-pressure and be sucked into the tube. Its external diameter is usually about 3/4 inch. One length will usually make two tubes of standard length for the cannon furnace.
He tested it, reading the tank air-pressure, power-storage, and other data from the lighted miniature instruments visible through pinholes above his eye-level. He fastened a space rope about himself, speaking through the helmet's opened faceplate. "If our friends should wake up before I get back," he added, "please restrain them. I'd hate to be marooned."
One bullet made a hole in the silk, but we didn't come down. Papa says a dozen bullets cannot bring a balloon down, even when they pierce the silk, because the air-pressure is great enough to keep the gas in. But he says that if they fire a shell, that is what is to be dreaded, for the gas, once aflame! that ends all. Dear me! we talk a great deal of war you and I. It is time for me to go."
We have here two tubes inserted at each end of the large tube, and in each of these is a cock. We have each cock connected by a rod to the lever set on a pin in the middle of the tube. Now if the air-pressure is constant through the forked air-tube, and the cock E. is open, if the top of the lever is moved to the right, the pellet will be pushed to the left in the large tube.
Bohannan departed. The droning of the helicopters rose to a shrill hum. The Master switched in the air-pressure system; and far underneath, white fountains of spumy water leaped up about the floats, mingled with sand and mud all churned to frenzy under the bursting energy of the compressed air released through thousands of tubules.
The hot mud seems to be thrown into violent turmoil, emitting thick clouds of steam, which soon entirely envelop the spectator near the edge. The scientific mind is at first inclined to see in this phenomenon the mechanical effect of reduced air-pressure, due to the higher temperatures above the surface of the boiling mud, though doubts are raised by the unusual intensity of the reaction.
"The air-pressure," said Crane, "while greater than that now obtaining upon Earth, was probably of the order of magnitude of three meters of mercury, originally. As to the erosion, they might have had more water to begin with than our Earth had." "Yeah, that'd account for it, all right," said Dorothy. "There's one thing I want to ask you two scientists," Margaret said.
You do not touch it with anything; you may push it back and forth with your breath as many times as you wish, not by blowing against it, so to speak, but by producing an actual air-pressure upon it which is confined by the sides of the tube and cannot go elsewhere. The only pressure necessary is enough to move the pellet.
"Of course," he continued, "we are working under a high air-pressure just now, some days as high as forty pounds. You see, we have struck the very worst part of the job, a stretch of quicksand in the river-bed, and if we can get through this we'll strike pebbles and rock pretty soon, and then we'll be all right again." He paused. Paddy quietly put in: "Beggin' yer pardon again, Mr.
A lashing had given way! Part of the left hand plane had broken loose. Drunkenly, whirling head over like an albatross shot in mid-air, the Pauillac plunged. It righted, swerved, shot far ahead, then once again somersaulted. Stern had disjointed, crazy thoughts of air-pressure, condensation and compression, resistance, abstruse formulae.
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